1ZVN460100-C Operation Manual

1ZVN460100-C

Operation manual

1ZVN460100-C 2 / 3

Table of contents 1 Bushings ...................................................................................................................... 2 Tapchanger .................................................................................................................. 3 Cooling Equiptment.....................................................................................................

3.1 Cooling Fans ....................................................................................................... 3.2 Radiators ...............................................................................................................

4 Current Transformer.................................................................................................... 5 Other Accessories .......................................................................................................

1ZVN460100-C

1 Bushing 1.1 Bushing CEDASPE

1.2 Bushing GOB

1.3 Bushing GOE

1.4 Bushing GOH

1.5 Bushing GSA-AAA

1.6 Bushing WEBSTER WIKINSON

Nome file : New LV Bushing ED Mar 2004 Cat 0403 – UNCONTROLLED COPY Pagina 1 di 6

LV Bushing “ED” by CEDASPE

Cedaspe is happy to present a new family of LV bushings for distribution transformers with

an innovative design (patent pending) These new bushings are in accordance with the new European specifications EN 50386, recently approved by all the European National Committees, but already

included in the old Cenelec document HD596 The design ED bushing is an evolution of the old DIN design and takes in consideration the

new technologies and the specific requirements of the major customers.

ED 02 - drg 1390, Voltage rating 1 kV ◘Current rating 250 A ◘Nominal creepage distance 60 mm Brass rod

Two design of the oil side connection:

- ED-N/02, Threaded for traditional connection with brass nuts - ED-S/02, With bottom spade for rivet connection


ED 06 - drg 1391, Voltage rating 1 kV ◘Current rating 630 A ◘Nominal creepage distance 75 mm Brass rod (Copper rod upon request)

Two design of the oil side connection:

- ED-N/06, Threaded for traditional connection with brass nuts - ED-S/06, With bottom spade for rivet connection

Note: Important to say regarding 630 A bushings that the new specification EN50386 state that the

conductor can be in brass, instead of copper (as it was before). Rising temperature test and long experience in this kind of execution made by the major European manufacturers, confirm that with oil at a temperature of 60°C above ambient temperature the bushing ED06-Ms satisfy in full the requirements of IEC 137, with the following results: - Brass rod overtemperature of the oil side connection at 630 A above oil < 8°C - Brass rod overtemperature of the air side connection at 630 A above air < 60°C A real current of 630A is a not frequent case, occurring on a 250kVA transformer with 230V rated voltage (threephase) Considering the most common use of this bushing on a 400 kVA transformer, 400 V, the real current is only 580 A, and in this condition the performance of the bushings ED06-Ms is even better: - Brass rod overtemperature of the oil side connection at 580 A above oil < 6°C - Brass rod overtemperature of the air side connection at 580 A above air < 55°C


The most important characteristics of the ED Bushings are:

- Full interchangeability of ED/02 with the old 1/250 DIN and of ED/06 with the old 1/630 DIN The use of the new bushing doesn’t require any change in the design of the transformer as the bushings ED have the same fixing hole on the tank and are protruding under the cover with the same distance. - Special gaskets design, special top cap and special flange gaskets seats in order to avoid gasket protruding externally, as it happens with the DIN 1/250 and 1/630, when the gasket are compressed at the right tightening torque. This reduce a lot the risk of gaskets cracks due to UV radiation. - Minor number of components to make the bushings; it means higher reliability (less pieces less possibilities of failure!!!!), but more important less pieces, less time required for the bushing assembly on the transformer cover.

- Reinforced nylon support on the oil side, instead of the “B” bottom porcelain, which doesn’t require any internal spacer gasket (in fibre or presspan) - Only two tightening gaskets on the air side instead of the three pieces required by the DIN models: 33 % lower risk of oil leakage - Special profile of the flange NBR gaskets, with lips to enable an easier centering of the gasket on the porcelain stem


The picture below shows the two special tightening gasket protected form UV radiation, by the cap and by the flange seat

The direct economic advantages are :

- Lower price of ED/02 and ED/06 than the corresponding DIN 1/250 and 1/630 - Price reduction is amplified in case of ED/06-Ms, due toi the possibility of using a

brass rod, as said above

There is an important indirect economic advantage: - Saving of 25% of the total working time necessary for the assembly of the bushing on

the transformer (total working time considering picking of the components, assembly, tightening)


LOGISTIC: Highly standardized product means short delivery time Easy storage and easy use of the bushings, partially assembled, inside a dedicated

package: • ED 02: 16 pcs in board boxes size cm 26x26 h22 • ED 06: 12 pcs in board boxes size cm 30x22 h27

The result is a reduction of the total mounting time of the bushing on the transformer cover Standard delivery lots, with board boxes (12/16 pcs) in strong pressboard cases with 4ways

wooden pallet suitable for truck and container transport, and for warehousing in racks: • ED 02: 576 pcs, case size cm 110x80 h 90, gross weight ~kg 340 (volume ~m³ 0,80) • ED 06: 240 pcs, case size cm 110x80 h 70, gross weight ~kg 390 (volume ~m³ ~0,65)


LV Bushing “ED-SA”

The bushings style ED-SA have a top porcelain with a special profile for polluted environment with an increased creepage distance of 120 mm . With this solution it is possible to avoid to use a 3 kV class bushing, just only for the major creepage distance, on transformers with LV voltage rating below 1 kV, with big savings in terms of cost. All the characteristics of the bushings remain the same of the normal execution ED, with only one difference: the porcelain has a flat flange without groove and the flange gasket is flat in rubber impregnated cork.

Transformer bushings, type GOBTechnical guide

2

This Technical Guide has been produced to allow transformer manufacturers, and theirdesigners and engineers, access to all the technical information required to assist them intheir selection of the appropriate Transformer Bushing. The Guide should be used inconjunction with the Selection Guide to allow the optimum selection to be made.

The technical information pertaining to bushings manufactured by ABB Components hasbeen divided into separate documents, with one document for each type.

The information provided in this document is intended to be general and does not coverall possible applications. Any specific application not covered should be referred directlyto ABB Components AB, or its authorized representative.

ABB Components AB makes no warranty or representation and assumes no liability forthe accuracy of the information in this document or for the use of such information. Allinformation in this document is subject to change without notice.

ABB Components also manufactures the following products:

Wall bushingsGIS bushingsOn-load tap-changersMotor-drive mechanisms

3

Table of ContentsDesign _______________________ 4

Shed form ___________________________ 4Test tap _____________________________ 5

Testing _______________________ 5Test tap adapter ______________________ 5

Common specifications__________ 5

Dimensions ___________________ 6Bushings without oil level gauge _________ 6

Electrical data _________________ 7

Dimensions ___________________ 8Bushings with oil level gauge ____________ 8

Electrical data _________________ 9

Connection details _____________ 10Inner terminal ________________________ 10Solid rod conductor____________________ 10Outer terminal assembly _______________ 10Separate terminal plate with bolts ________ 11Arcing horns _________________________ 11

Conductor loading______________ 11Overloading of bushings ________________ 11Short-time current _____________________ 11

Ordering particulars ____________ 12Bushings without oil level gauge _________ 12Bushings with oil level gauge ____________ 14

Recommendations for positioning _ 16

4

Fig. 1. Transformer bushing type GOB

Outer terminal stud

Expansion space

DesignThe bushing is built up around a centre tube on which thecondenser body is wound.

The upper insulator, lower insulator and mounting flangeare held between the end plates by the centre tube.Sealing is accomplished by oil-resistant rubber gaskets ingrooves.

The annular space between the condenser body and theporcelain is filled with transformer oil. A gas-filled expansionspace is left at the top.

For GOB bushings without oil level gauge the oil level canbe checked by means of a dipstick in the oil filling hole.

The lower end is shielded by an epoxy resin insulatedaluminium shield.

The inner terminal is attached to the centre tube by meansof a through-going resilient pin which becomes lockedwhen the outer terminal is screwed on. The design with thisspecial resilient pin has been patented by ABB, and the pinensures effective electrical contact between the inner andouter terminals.

The inner terminal can be chosen for connection to leadseither by brazing or crimping.

The outer terminal is available in aluminium or copper alloyand can be supplemented by terminal plates ofcorresponding material.

The upper insulator is made in one piece of high qualityelectrical porcelain. The mounting flange is manufacturedof corrosion-resistant aluminium alloy.

The mounting flange, the top housing and the top washerare protected by painting with a two-component primer anda grey-blue finishing coat of paint. The standard colour isMunsell 5.5B 55/1.25, environmental class C3.

The bushings are delivered oil-filled and ready for use.

If the bushing is mounted with an inclination of more than45° from the vertical, special measures may have to betaken to ensure sufficient filling of oil in the bushing.Further information can be obtained on request.

Shed form

The shed form for all GOB bushings is of the anti-fog typewith alternating long and short sheds. For each pair ofsheds the ratio between nominal creepage distance andthe axial length is 3.43 and the ratio between protected andnominal creepage distance is 0.40.

Oil

Porcelain insulatorair side

Oil filling holeswith sealing plug

Test tap

Mounting flange

Flange extension

Porcelain insulatoroil side

Condenser body

Insulated shield

Prismglass

Tophousing

Oil fillingholes with

sealing plug

Tophousing

Fig. 2. Shed form

Topwasher

According to IEC 815 the creepage factor C.F. is <3.2 andthe profile factor P.F. is >1.1.

For special customer demands regarding creepagedistance, other shed forms may be used.

5

Test tap

The outer conducting layer of the condenser body isconnected to an insulated test tap on the flange. Duringoperation the test tap cover must be screwed on, in orderto earth the outer layer to the flange. The max. test voltageof the tap is 2 kV, 50 Hz for 1 minute. Max. service voltageis 600 V.

TestingDuring the manufacture and on its completion the bushingis subjected to a number of routine tests. A tightness testis carried out on the assembled bushing after the finaldrying and impregnation. The test is made with an oiloverpressure of 180 kPa (1.8 bar) for 12 hours at ambienttemperature. No sign of leakage is allowed.

Each bushing is subjected to a final electrical routine test.The test is made at room temperature with the bushingsubmerged in oil. Capacitance and tan � are measured insteps up to the power frequency withstand voltage, whichis maintained for one minute.

Capacitance and tan � are also measured at decreasingvoltage at the same voltage levels as before the oneminute test.

Measurements for detection of internal partial discharge(PD measurements) are also made. These measurementsare carried out at the same time as the power frequencywithstand test. PD measurements are made in steps up tothe full test voltage and down. It is always demonstratedthat the PD value is max. 5 pC at test voltage equal to therated system voltage.

Type tests have been carried out according to IEC 137 andIEEE. Type test reports are available on request.

Test tap adapter

For testing, a special test adapter is required for permanentconnection of the test tap to the measuring circuits.

Fig. 3. Test tap

Common specificationsApplication: TransformersClassification: Oil impregnated paper, capacitance graded, outdoor-immersed bushingAmbient temperature: +40 to -40 °C, minimum value as per temperature class 2 of IEC 137Altitude of site: < 1 000 mLevel of rain and humidity: 1-2 mm rain/min horizontally and vertically, as per IEC 60-1Pollution level: According to specified creepage distance and IEC 815 1

Type of immersion medium: Transformer oil. Maximum daily mean oil temperature 90 °C. Maximum temporary oil temperature 115 °COil level below bushing flange: Maximum 30 mmMax. pressure of medium: 100 kPa overpressureMarkings: Conforming to IEC/ IEEE

1) IEC 815 "Guide for selection of insulators with respect to polluted conditions."

goh_0010

Fig. 4. Test tap adapter, 2769 531-D.

goh_0011

6

DimensionsBushings withoutoil level gauge

Spaceforcurrent Top

Rated trans- Net design Dimensions in mmType current former mass acc. toGOB A Cat. No. mm kg Fig. 5. L1) L1 1) L2 L3 L4 L5 1) L6 L7 L8 L9 1)

250 800 LF 123 013– – 23 2 998 240 590 65 555 60 – 480 70 15015– 300 25 2 1258 500 590 555 260083– 500 27 3 1558 700 690 655 460

250 1250 LF 123 017– – 26 2 1063 255 605 65 580 75 – 480 70 25019– 300 29 2 1323 515 605 580 260085– 500 31 3 1623 715 705 680 460

325 800 LF 123 025– – 27 2 1198 295 735 93 700 60 – 625 70 15027– 300 31 2 1458 555 735 700 260089– 500 35 3 1758 755 835 800 460

380 800 LF 123 037– – 33 2 1303 345 790 98 755 60 – 680 70 15039– 300 37 2 1543 585 790 755 240095– 500 39 3 1843 785 890 855 440

380 1250 LF 123 041– – 37 2 1368 360 805 98 780 75 – 680 70 25043– 300 39 2 1608 600 805 780 240097– 500 43 3 1908 800 905 880 440

450 800 LF 123 049– – 42 2 1473 345 960 98 925 60 – 850 70 15051– 300 45 2 1713 585 960 925 240053– 500 48 3 2013 785 1060 1025 440

550 800 LF 123 061– 100 70 2 1823 495 1160 60 1125 90 95 1050 60 25063– 300 73 3 2108 680 1260 1225 280107– 500 77 3 2308 880 1260 1225 480

550 1250 LF 123 065– 100 105 2 1868 495 1170 68 1145 100 95 1050 60 30067– 300 109 3 2153 680 1270 1245 280109– 500 115 3 2353 880 1270 1245 480

650 1250 LF 123 073– 150 116 2 2153 580 1370 60 1345 100 120 1250 60 30075– 300 122 3 2413 740 1470 1445 280113– 500 126 3 2613 940 1470 1445 480

750 1250 LF 123 077– 200 180 2 2468 685 1580 70 1555 100 165 1460 60 30078– 300 190 3 2683 800 1680 1655 280079– 500 200 3 2883 1000 1680 1655 480

Fig. 5.2.Top design

Fig. 5.3Top design

Fig. 5.4

n1 HolesD = 16

Drawleadlength =

1) The bushings can be providedwith a longer shield L9 + 50 mm,in which case dimensions L, L1and L5 also increase by 50 mm.

Fig. 5.1. GOB design

7

Electrical dataRating Routine test Design data Nominal capacitances between

conductor and test tapRated Phase-to- Dry Wet power Dry C1 ±10 % [pF]voltage earth voltage lightning frequency 1 min. dry switching Space for current transformer

Type UR UY impulse AC 50 Hz impulseGOB kV, RMS kV, RMS kV, peak kV, RMS kV, RMS kV, peak - 100 150 200 300 500

250-800 52 52 250 105 120 230 125 205 275250-1250 52 52 250 105 120 230 165 270 375325-800 72.5 72.5 350 140 160 300 135 200 260380-800 100 72.5 380 150 162 330 145 200 245380-1250 100 72.5 380 150 162 330 185 265 320450-800 123 90 450 185 195 410 145 200 245550-800 170 123 550 230 260 470 150 170 210550-1250 170 123 550 230 260 470 175 195 240650-1250 170 145 650 275 300 580 190 235 280750-1250 170 170 750 325 365 670 205 235 275

Wet power frequency values apply to both IEC and ANSI requirements.

Dimensions are subject to modification without notice.

Cantilever load

Max. permittedCreeepage distance loading

perpendicular 60 stotal protected to the terminal Test

D1 D2 D3 D4 D5 D6 D7 D8 D10 n1 R1 R2 T mm mm N N

86 22 86 115 88 185 225 230 46 6 8 6 16 1500±50 580 1800 2340

101 34 112 120 101 250 290 245 70 8 12 10 16 1500±50 580 3000 4000

95 22 86 115 96 185 225 230 46 6 8 6 16 1980±50 775 1500 1950

95 22 86 115 96 185 225 240 46 6 8 6 16 2210±70 870 1400 1800

112 34 112 120 112 250 290 245 70 8 12 10 16 2210±70 870 2900 3750

95 22 86 115 96 185 225 245 46 6 8 6 16 2720±80 1060 1150 1500

126 22 118 145 150 250 290 280 50 8 12 12 18 3430±100 1350 1300 1800

160 34 140 175 200 290 335 300 70 12 15 15 20 3430±100 1350 2400 3100

160 34 140 175 200 290 335 305 70 12 15 15 20 4080±110 1620 2600 3380

184 34 140 230 184 290 335 350 70 12 15 15 20 4800±150 1700 2600 3350

8

DimensionsBushings withoil level gauge

Fig. 6.2.Top design

Fig. 6.3Top design

Spaceforcurrent Top

Rated trans- Net design Dimensions in mmType current former mass acc. toGOB A Cat. No. mm kg Fig. 6. L 1) L1 1) L2 L3 L4 L5 1) L6 L7 L8 L9 1)

250 800 LF 123 171– – 24 2 1138 240 730 65 695 60 – 480 70 15173– 300 26 1398 500 260175– 500 28 1598 700 460

250 1250 LF 123 167– – 28 2 1203 255 745 65 720 75 – 480 70 25168– 300 30 1463 515 260169– 500 33 1663 715 460

325 800 LF 123 177– – 28 2 1338 295 875 93 840 60 – 625 70 15179– 300 32 1598 555 260181– 500 36 1798 755 460

380 800 LF 123 183– – 34 2 1443 345 930 98 895 60 – 680 70 15185– 300 38 1683 585 240187– 500 40 1883 785 440

380 1250 LF 123 101– – 38 2 1508 360 945 98 920 75 – 680 70 25102– 300 41 1748 600 240103– 500 44 1948 800 440

450 800 LF 123 145– – 43 2 1613 345 1100 98 1065 60 – 850 70 15147– 300 46 1853 585 240149– 500 49 2053 785 440

550 800 LF 123 189– 100 71 2 1963 495 1300 60 1265 90 95 1050 60 25190– 300 74 2148 680 280191– 500 78 2348 880 480

550 1250 LF 123 142– 100 106 2 2008 495 1310 68 1285 100 95 1050 60 30143– 300 110 2193 680 280144– 500 116 2393 880 480

650 1250 LF 123 192– 150 118 2 2293 580 1510 60 1485 100 120 1250 60 30193– 300 124 2453 740 280194– 500 128 2653 940 480

750 1250 LF 123 104– 200 187 3 2718 685 1830 70 1805 100 165 1460 60 30105– 300 197 2833 800 280106– 500 207 3033 1000 480

Fig. 6.4

1) The bushings can be providedwith a longer shield L9 + 50 mm,in which case dimensions L, L1and L5 also increase by 50 mm.

n1 HolesD = 16

Drawleadlength =

Fig. 6.1. GOB design.

9

Cantilever load

Max. permittedCreepage distance loading

perpendicular 60 stotal protected to the terminal Test

D1 D2 D3 D4 D5 D6 D7 D8 D10 n1 R1 R2 T mm mm N N

86 22 86 140 88 185 225 230 46 6 8 6 16 1500±50 580 1800 2340

101 34 112 140 101 250 290 245 70 8 12 10 16 1500±50 580 3000 4000

95 22 86 140 96 185 225 230 46 6 8 6 16 1980±50 775 1500 1950

95 22 86 140 96 185 225 240 46 6 8 6 16 2210±70 870 1400 1800

112 34 112 140 112 250 290 245 70 8 12 10 16 2210±70 870 2900 3750

95 22 86 140 96 185 225 245 46 6 8 6 16 2720±80 1060 1150 1500

126 22 118 200 150 250 290 280 50 8 12 12 18 3430±100 1350 1300 1800

160 34 140 265 200 290 335 300 70 12 15 15 20 3430±100 1350 2400 3100

160 34 140 265 200 290 335 305 70 12 15 15 20 4080±110 1620 2600 3380

184 34 140 265 184 290 335 350 70 12 15 15 20 4800±150 1700 2600 3350


Electrical dataRating Routine test Design data Nominal capacitances between

conductor and test tapRated Phase-to- Dry Wet power Dry C1 ±10 % [pF]voltage earth voltage lightning frequency 1 min. dry switching Space for current transformer

Type UR UY impulse AC 50 Hz impulseGOB kV, RMS kV, RMS kV, peak kV, RMS kV, RMS kV, peak - 100 150 200 300 500

250-800 52 52 250 105 120 230 125 205 275250-1250 52 52 250 105 120 230 165 270 375325-800 72.5 72.5 350 140 160 300 135 200 260380-800 100 72.5 380 150 162 330 145 200 245380-1250 100 72.5 380 150 162 330 185 265 320450-800 123 90 450 185 195 410 145 200 245550-800 170 123 550 230 260 470 150 170 210550-1250 170 123 550 230 260 470 170 195 240650-1250 170 145 650 275 300 580 205 235 280750-1250 170 170 750 325 365 670 205 235 275

Wet power frequency values apply to both IEC and ANSI requirements.

10

Connection detailsInner terminal

Stud made of copper forconnection of draw lead.The inner terminal must beprovided with an outerterminal.

For crimping, hexagonal orother symmetrical dies shallbe used. Pressure 200 kN.

Stud made of copper oraluminium with O-ring andlocking pin.

Other types can be providedon request.

Outer terminal assembly

Width across flats N

Fig. 7. Inner terminal.

Fig. 9. Outer terminal assembly.

Material and Conductor Dimensions (mm) Massdesign area mm² Cat. No. D1 D2 L kg

Copper 50 LF 170 010-M 11 14,5 35 0,3for crimping 70 -N 13 17 35 0,3or brazing 95 -L 15 20 35 0,3

Copper < 150 LF 170 011-S 18 20 35 0,3for brazing undrilled -U 5 20 35 0,3only < 285 -T 29 32 20 0,6

undrilled -V 5 32 20 0,6

Forbushings

Dimensions (mm) Mass with D2Material Cat. No. D L N kg mm

Aluminium LF 170 001-A 30 170 55 0.5 22-B 30 205 66 0.8 34

Copper LF 170 002-A 30 170 55 1.2 22alloy -B 30 205 66 2.3 34

Rated current 1250 ALF 170 052-

Rated current 800 ALF 170 019-

Fig. 8. Solid rod conductor.

Solid rod conductor

The rod is produced from electrolytic copper and is dividedinto two parts. For the 800 A conductor the two parts areheld together by a centre bolt with a resilient locking pin.For the 1250 A conductor the two parts are connected bycounter-sunk screws.

The lower part of the solid rod is designed to enableconnection by brazing.

The solid rod conductor can be divided either:Alt. 1: 20 mm below the bushing flange, orAlt. 2: 20 mm below the upper end of the bottom porcelain.

The solid rod conductor must be provided with an outerterminal.

11

Separate terminal plate with bolts

The separate terminal plate is used for connecting thebushing to the line conductor.

Material Cat. No.

Aluminium LF 170 014-A

Copper alloy LF 170 021-A

Fig. 10. Separate terminal plate with bolts.

Arcing horns

Arcing horns of galvanised steel can be mounted on thebushing.

The lower rod is fastened onto the flange with one of thefixing screws and the upper rod by means of a bracket onthe outer terminal.

The gap distances for standard arcing horns are shown inthe table. Other gap distances on request.

Overloading of bushings

If the conductor for the bushing is selected with 120 % ofthe rated current of the transformer, the bushing isconsidered to be able to withstand the overload conditionsstated in IEC 354 without further clarifications or tests,according to IEC 137.

Short-time current

The rated thermal short-time current (Ith) is calculatedaccording to IEC 137 (1995).

For draw-lead of stranded copper values are given for100mm2. For other areas the short-time current is directlyproportional to the area.

Rated Short-time current (Ith) Dynamiccurrent Area 1s 2s current (Id)

Conductor A mm2 kA, RMS kA, RMS kA, peak

Solid rod 800 - 30 21 52

Solid rod 1250 - 70 50 125

Strandeddraw-lead 365 100 9.6 6.8 17

Conductor loadingThe rated currents listed in this catalogue are thestandardised values according to IEC 137 (1995) which,with the largest possible conductor, fulfil the temperaturerise test.

The GOB bushings fulfil the temperature rise testrequirements according to IEC 137 (1995) andIEEE C57.19.00-1991:

Rated current Permissible currentof bushing IEC IEEEA Conductor A A

800 Solid rod LF 170 019 800 7301250 Solid rod LF 170 052 1250 1200800, 1250 Stranded cable 50 mm2 165 150800, 1250 Stranded cable 70 mm2 225 210800, 1250 Stranded cable 95 mm2 300 285800, 1250 Stranded cable 150 mm2 475 4151250 Stranded cable 185 mm2 530 4601250 Stranded cable 285 mm2 665 570

Fig. 11. Gap distances.

Bushing K C Htype mm mm mm

GOB 250 230–440 315 112GOB 325 320–580 315 112GOB 380 400–620 315 112GOB 450 400–780 315 112GOB 550 620–960 315 114GOB 650 700–1080 380 224GOB 750 820–1290 380 224

12

Ordering particularsBushings without oil level gauge When ordering, please state:

• Type and Catalogue number for bushings.• Catalogue number for inner and outer terminal

assembly.• Additional accessories or modifications.• Test required, in addition to the normal routine tests.• Test tap adapter, if required.

Note:The Cat. No. should have one of the following lettersadded to it, to indicate the type of insulator and oil endshield:

–K Normal oil end shield, brown porcelain–L Normal oil end shield, light grey porcelain–M Longer oil end shield, brown porcelain–N Longer oil end shield, light grey porcelain

Bushings Connection detailsInner terminal stud: Cat. No. LF 170

Space for BushingRated current tube For crimping or brazing For brazing

Type current transformer (See fig.) Conductor area Conductor area Undrilled withGOB A Cat. No. mm D2, mm 50 mm2 70 mm2 95 mm2 <150 mm2 <285 mm2 pilot hole

250 800 LF 123 013– – 22 010-M 010-N 010-L 011-S – 011-U015– 300083– 500

250 1250 LF 123 017– – 34 – – – – 011-T 011-V019– 300085– 500

325 800 LF 123 025– – 22 010-M 010-N 010-L 011-S – 011-U027– 300089– 500

380 800 LF 123 037– – 22 010-M 010-N 010-L 011-S – 011-U039– 300095– 500

380 1250 LF 123 041– – 34 – – – – 011-T 011-V043– 300097– 500

450 800 LF 123 049– – 22 010-M 010-N 010-L 011-S – 011-U051– 300053– 500

550 800 LF 123 061– 100 22 010-M 010-N 010-L 011-S – 011-U063– 300107– 500

550 1250 LF 123 065– 100 34 – – – – 011-T 011-V067– 300109– 500

650 1250 LF 123 073– 150 34 – – – – 011-T 011-V075– 300113– 500

750 1250 LF 123 077– 200 34 – – – – 011-T 011-V078– 300079– 500

Oil endshield

13

Outer terminal assembly: Cat. No. LF 170

Stud with O-ring Separate terminal Solid rod conductor Arcingand locking pin plate with bolts Cat. No. LF 170 horns

Cat. No.Aluminium Copper alloy Aluminium Copper alloy Alt. 1 Alt. 2 Mass kg LF 170

001-A 002-A 014-A 021-A 019 -A – 2.6 004 -A-D 019 -B 3.3 -A-E -C 4.2 -B

001-B 002-B 014-A 021-A 052 -A – 6.8 004 -A-D 052 -B 8.4 -A-E -C 10.6 -B

001-A 002-A 014-A 021-A 019 -F – 3.1 004 -A-K 019 -G 3.9 -A-L -H 4.7 -B

001-A 002-A 014-A 021-A 019 -M – 3.5 004 -A-R 019 -N 4.2 -A-S -P 5.0 -B

001-B 002-B 014-A 021-A 052 -V – 8.6 004 -B-Z 052 -X 10.4 -B-AA -Y 12.7 -B

001-A 002-A 014-A 021-A 019 -BL – 4.0 004 -B-BM 019 -BN 4.7 -B-BP -BR 5.5 -C

001-A 002-A 014-A 021-A 019 -T – 4.9 004 -B-X 019 -U 5.7 -C-Y -V 6.3 -C

001-B 002-B 014-A 021-A 052 -AM – 12.0 004 -B-AN 052 -AP 14.1 -C-AR -AS 15.5 -C

001-B 002-B 014-A 021-A 052 -F – 14.0 005 -A-K 052 -G 15.9 -B-L -H 17.5 -B

001-B 002-B 014-A 021-A 052 -M – 16.3 005 -B-R 052 -N 18.0 -E-S -P 19.5 -E

LF 170 052-1250 A

LF 170 019-800 A

14

Ordering particularsBushings with oil level gauge

Bushings Connection detailsInner terminal stud: Cat. No. LF 170

Space for BushingRated current tube For crimping or brazing For brazing

Type current transformer (See fig.) Conductor area Conductor area Undrilled withGOB A Cat. No. mm D2, mm 50 mm2 70 mm2 95 mm2 <150 mm2 <285 mm2 pilot hole

250 800 LF 123 171– – 22 010-M 010-N 010-L 011-S – 011-U173– 300175– 500

250 1250 LF 123 167– – 34 – – – – 011-T 011-V168– 300169– 500

325 800 LF 123 177– – 22 010-M 010-N 010-L 011-S – 011-U179– 300181– 500

380 800 LF 123 183– – 22 010-M 010-N 010-L 011-S – 011-U185– 300187– 500

380 1250 LF 123 101– – 34 – – – – 011-T 011-V102– 300103– 500

450 800 LF 123 145– – 22 010-M 010-N 010-L 011-S – 011-U147– 300149– 500

550 800 LF 123 189– 100 22 010-M 010-N 010-L 011-S – 011-U190– 300191– 500

550 1250 LF 123 142– 100 34 – – – – 011-T 011-V143– 300144– 500

650 1250 LF 123 192– 150 34 – – – – 011-T 011-V193– 300194– 500

750 1250 LF 123 104– 200 34 – – – – 011-T 011-V105– 300106– 500

When ordering, please state:• Type and Catalogue number for bushings.• Catalogue number for inner and outer terminal

assembly.• Additional accessories or modifications.• Test required, in addition to the normal routine tests.• Test tap adapter, if required.

Note:The Cat. No. should have one of the following lettersadded to it, to indicate the type of insulator and oil endshield:

–K Normal oil end shield, brown porcelain–L Normal oil end shield, light grey porcelain–M Longer oil end shield, brown porcelain–N Longer oil end shield, light grey porcelain

Oil endshield

15

Outer terminal assembly: Cat. No. LF 170

Stud with O-ring Separate terminal Solid rod conductor Arcingand locking pin plate with bolts Cat. No. LF 170 horns

Cat. No.Aluminium Copper alloy Aluminium Copper alloy Alt. 1 Alt. 2 Mass kg LF 170

001-A 002-A 014-A 021-A 019 -AM – 3.0 004-B-AS 019 -AT 3.7 -B-BB -BC 4.3 -B

001-B 002-B 014-A 021-A 052 -BC – 7.7 004-B-BF 052 -BD 9.3 -B-BG -BE 10.8 -B

001-A 002-A 014-A 021-A 019 -AN – 3.5 004-B-AU 019 -AV 4.3 -B-BD -BE 4.8 -B

001-A 002-A 014-A 021-A 019 -AP – 3.9 004-B-AX 019 -AY 4.6 -B-BF -BG 5.1 -B

001-B 002-B 014-A 021-A 052 -BK – 9.6 004-B-BN 052 -BL 11.4 -B-BP -BM 12.6 -B

001-A 002-A 014-A 021-A 019 -BS – 4.4 004-C-BT 019 -BU 5.1 -C-BV -BX 5.6 -C

001-A 002-A 014-A 021-A 019 -AR – 5.3 004-C-AZ 019 -BA 5.8 -C-BH -BK 6.4 -C

001-B 002-B 014-A 021-A 052 -AT – 13.0 004-C-AU 052 -AX 14.4 -C-AV -AY 15.8 -C

001-B 002-B 014-A 021-A 052 -AD – 14.9 005-B-AE 052 -AF 16.1 -B-AG -AH 17.7 -B

001-B 002-B 014-A 021-A 052 -AZ – 18.0 005-F-BA 052 -BB 19.0 -F-AK -AL 20.5 -F

LF 170 052-1250 A

LF 170 019-800 A

16

The maximum stresses in the oil at the surface of the shieldinsulation must be limited to those values normal forinsulated conductors and similar components in the sametransformer.

The adjacent recommendations are intended as guidelines when complete calculations are not carried out.

Recommendations for positioning

Earthedlayer

Distance touninsulated detail Distance to flat

surface e.g. tank orcore clamp

––––––––––––––––––––––––––––––––––––––––––––––Type Internal RGOB insulation level (mm)

of transformer(kV)

––––––––––––––––––––––––––––––––––––––––––––––250/800 170-70 65

250-95 75

250/1250 170-70 75250-95 85

325/800 250-95 75325-140 100

380/800 325-140 100380-150 105

380/1250 325-140 105380-150 110

450/800 380-150 105450-185 125

550/800 450-185 130550-230 155

550/1250 450-185 140550-230 160

650/1250 550-230 160650-275 185

750/1250 650-275 185750-325 210

––––––––––––––––––––––––––––––––––––––––––––––

Nameplate withmarking example.

No. 257 007Ur/Uy 52/52 kV Ir 800 A 50/60 HzLI / AC 250/120 kVM 23 kg L 240 mm 0-90 °

C1 128 pF Tan � 0.33 %C2 80 pF Tan � 0.45 %

ABB Components Ludvika, SwedenLF 123 013-KGOB 250

Transformer bushings, type GOETechnical guide

2

This Technical Guide has been produced to allow transformer manufacturers, and theirdesigners and engineers, access to all the technical information required to assist them intheir selection of the appropriate Transformer Bushing. The Guide should be used inconjunction with the Selection Guide to allow the optimum selection to be made.


The information provided in this document is intended to be general and does not cover allpossible applications. Any specific application not covered should be referred directly toABB Components AB, or its authorized representative.



Wall bushingsOn-load tap-changersMotor-drive mechanisms

3


Shed form ___________________________5

Testing _______________________ 5Test tap _____________________________5Test tap adapter______________________ 5

GOE 250-210 to 450-400 ________ 6

GOE 650-500 to 900-650 ________ 7

GOE 1050-750 to 1300-1150 _____ 8

GOE 1550-1050 to 1800-1300 ____ 9

GOE 2100-1425 to 2550-1600 ____ 10

Common specifications __________ 11

Connection details _____________ 11Draw rod system______________________11Draw lead system _____________________12Outer terminal ________________________12

End-shields ___________________ 13

Current capacity _______________ 14Short-time current _____________________14Overload capacity of bushings ___________14

Ordering particulars ____________ 15

4

DesignThe bushing is built up around a centre tube on which thecondenser body is wound. The condenser body is woundfrom insulating paper of the same type as is used for high-voltage cables. For bushings up to 550 kV paper of fullwidth is employed. Bushings for higher voltages are woundfrom paper strips in a manner similar to that used forcables.

The foils are located so that the best possible combinationof external flashover and internal puncture strength isachieved.

The upper insulator, which is made in one piece withoutgaskets, the lower insulator and the mounting flange areheld between the end plates by the centre tube and sealingis accomplished by oil-resistant rubber gaskets in grooves.

A set of concentric tubes are prestressed and serve assprings which hold the main bushing components togetherand provide adequate pressure on the gaskets in allexpected temperature and load conditions.

The annular space formed between the tubes makes anefficient cooling duct for dissipation of the heat, thusimproving the current-carrying capacity and thermal stabilityof the bushing.

The bushing is designed to be mounted at an angle notexceeding 60° from the vertical. A higher inclination can beobtained on request.

The top housing is made of aluminium and has expansionspace for the oil, sufficient for temperature variations in thebushing between -40° and +80 °C. Variations in the lengthof the centre tube and the housing are compensated by aflexible connection inside the top housing. For GOE 250 to900 the top housing is equipped with two oil level gaugesof prisma type. For GOE 1175 and larger, the top housingis equipped with a magnetic oil level indicator.

The mounting flange is an aluminium alloy casting. Thegasket surface is machined flat. On the flange there is atest tap. This tap is automatically earthed by a protectivecap when the tap is not connected to external test ormeasuring circuits. The mounting flange and the top housingare protected by a two-component grey-blue paint.

For GOE 1175 and larger, the upper insulator is fastenedwith an additional clamping ring to the mounting flange.

The mounting flange can be equipped with extensions onthe oil side, providing space for current transformers.Extension lengths 300 and 600 mm are available asstandard, but other lengths can be quoted on request.

The rated current is defined according to IEC 137. It is validonly when the centre tube is used as conductor. For drawlead applications the permissible current will be lower.

Extension for currenttransformers

Bushings GOE 450 and larger require a shield at the oilend. The purpose of this shield is to avoid excessiveelectrical stresses in the oil at the lower end plate and at theconnection between the insulated lead from the transformerwinding and the draw lead or other conductors in thebushing. The maximum stresses in the oil at the surface ofthe shield insulation must be limited to those values normalfor insulated conductors and similar components in thesame transformer.

Sealing plugTop end nut

Flexible connection

Condenser body

Transformer oil

Pre-stressed tubes

Porcelain insulator,air side

Oil level gauge

Top housing

Clamping ring

Mounting flange

Bottom end nut

Porcelain insulator,oil side

Fig. 1. Transformer bushing type GOE

5

TestingDuring manufacture and on completion the bushing issubjected to a number of routine tests, according to IEC 137and IEEE bushing standards. A tightness test is carried outon the assembled bushing after the final drying andimpregnation. The test is made at an oil overpressure of180 kPa (1.8 bar) for 12 hours at ambient temperature. Nosign of leakage is allowed. Each bushing is subjected to afinal electrical routine test. The test is made at roomtemperature with the lower end of the bushing submerged inoil. Capacitance and tan δ are measured in steps up to thepower frequency withstand voltage, which is maintained forone minute.

Capacitance and tan δ are also measured with decreasingvoltage at the same voltage levels as before the one minutetest. Measurements for detection of internal partial discharge(PD measurements) are also made. These measurementsare carried out at the same time, and at the same levels, asthe tan δ test. It is always demonstrated that the PD value isbelow 5 pC at rated voltage (=√3 times bushing servicevoltage).

Shed form

The shed form for all GOE bushings is of the anti-fog typewith alternating long and short sheds. For each pair ofsheds the ratio between nominal creepage distance andthe axial length is 3.43 and the ratio between protected andnominal creepage distance is 0.40.

Fig. 2. Shed form

ABB Components manufactures shields of this type,which are quoted for and delivered separately. The shieldsare made of aluminium and are insulated with epoxy or alining of pressboard. The shield may be mounted on thelower end plate of the bushing, or on the bottom contact ofthe draw rod. Dimensions and recommendations, seepage 13.

If a special shield is used, it is of great importance that it isplaced in the right position in order to protect the bottomend of the bushing. Guidelines for positioning of the shieldare given in Fig. 14. ABB Components will also provideassistance with field calculations to confirm the performanceof other shielding systems.

Quotations for modifications in design and additional partssuch as special terminal studs, shields, rod gaps, etc., aswell as special tests, are given on request.

65

10°

36

R8

10°

R10

70

27.5R10

R8R5.5

18°

18°

R5.5

Bushings with rated voltage UR equal to or higher than300 kV are routine tested with a dry lightning impulse voltagewithstand test, when tested according to IEC 137.


Test tap

The GOE bushings are equipped with a test tap connectedto the outer layer of the condenser body. The max. testvoltage of the tap is 20 kV, 50 Hz for one minute. The routinetest voltage is 20 kV. Max. service voltage is 6 kV.

In connection with an external capacitance the test tap canbe used as a voltage tap. The test tap has dimensionsaccording to IEEE Potential tap type A.

Test tap adapter

For permanent connection of the test tap to measuringcircuits, a test tap adapter is required. Catalogue number2769 522-C.

Fig. 4. Test tap adapter.

(Pg 16 acc. to DIN 40430)Turnable in optional directionPr 22.5

goe_0019

Fig. 3. Test tap

6

GOE 250-210 to GOE 450-400Nominal voltages 52 kV to 170 kVLightning impulse 250 kV to 550 kV

Type Catalogue Insulator Rated Flange CreepageGOE Number colour current extension distance D1 L1±20 L2±25 L3 L4 L5±5 Mass

Brown/Light grey A mm mm mm mm mm mm mm kg

250-210 LF 121 051 -A/-AA 3150 0.6 1425±40 48 550 1060 605 725 985 200-B/-AB 3150 0.3 -”- 48 -”- -”- 305 430 685 190-C/-AC 5000 0.6 -”- 38 -”- -”- 605 725 985 245-D/-AD 5000 0.3 -”- 38 -”- -”- 305 430 685 225

380-300 LF 121 052 -A/-AA 3150 0.6 2380±65 48 825 1335 605 670 985 240-B/-AB 3150 0.3 -”- 48 -”- -”- 305 375 685 230-C/-AC 5000 0.6 -”- 38 -”- -”- 605 670 985 290-D/-AD 5000 0.3 -”- 38 -”- -”- 305 375 685 270

450-400 LF 121 053 -A/-AA 3150 0.6 3355±90 48 1120 1630 605 630 985 275-B/-AB 3150 0.3 -”- 48 -”- -”- 305 320 685 265-C/-AC 5000 0.6 -”- 38 -”- -”- 605 630 985 330-D/-AD 5000 0.3 -”- 38 -”- -”- 305 320 685 315

Table 1. Dimensions GOE 250 - GOE 450

Rating plate data

Type Rated Phase- Dry Wet Routine testGOE voltage to-earth lightning switching 1 min dry

UR voltage impulse impulse 50 HzkV, RMS UY LI SI kV, RMS

kV, RMS kV, Peak kV, Peak

250-210 52 52 250 210 120380-300 123 84 450 300 185450-400 170 123 550 400 260

Table 2. Electrical data GOE 250 - GOE 450

Other data for information

Type Flange Wet power Dry Nom. cap.GOE extension frequency switching between

AC impulse conductor andkV, RMS kV, Peak test tap (C1)

C1±10% (pF)

250-210 0.6 / 0.3 120 450 810 / 594380-300 0.6 / 0.3 170 550 594 / 448450-400 0.6 / 0.3 240 650 543 / 423


Type Max test load 1 min Max. perm. load (N)GOE acc. to IEC 137 (N) in operation at mounting angle

0° -30° -60°

250-210 5700 2800 2300 1700380-300 5700 2800 2300 1700450-400 5000 2500 2000 1500

Table 4. Mechanical loading GOE 250 - GOE 450

Fig. 5.

7

GOE 650-500 to GOE 900-650Nominal voltage 245 kVLightning impulse 650 kV to 950 kV

Type Catalogue Insulator Rated Flange CreepageGOE Number colour current extension distance D1 L1 L2 L3 L4 L5±5 Mass


650-500 LF 121 054 -A/-AA 3150 0.6 4045±105 48 1300±27 1810±33 605 700 1135 340-B/-AB 3150 0.3 -”- 48 -”- -”- 305 400 835 320-C/-AC 5000 0.6 -”- 38 -”- -”- 605 700 1135 400-D/-AD 5000 0.3 -”- 38 -”- -”- 305 400 835 380

900-650 LF 121 055 -A/-AA 3150 0.6 5735±150 48 1800±37 2310±42 605 615 1135 405-B/-AB 3150 0.3 -”- 48 -”- -”- 305 315 835 390-C/-AC 5000 0.6 -”- 38 -”- -”- 605 615 1135 480-D/-AD 5000 0.3 -”- 38 -”- -”- 305 315 835 455

Table 5. Dimensions GOE 650 - GOE 900. (See also Technical Guide, GOM, 1ZSE 2750-108.)

Fig. 6.

Rating plate data

Type Rated Phase- Dry Wet Routine testGOE voltage to-earth lightning switching 1 min dry

UR voltage impulse impulse 50 HzkV, RMS UY LI SI kV, RMS


650-500 245 155 650 500 325900-650 245 170 950 650 395





C1±10% (pF)

650-500 0.6 / 0.3 315 650 498 / 392900-650 0.6 / 0.3 395 750 448 / 365



0° -30° -60°

650-500 5700 2800 2300 1700900-650 5000 2500 2000 1500


8

GOE 1050-750 to GOE 1300-1150Nominal voltages 3621) kV to 420 kVLightning impulse 1050 kV to 1425 kV

Type Catalogue Insulator Rated Flange CreepageGOE Number colour current extension distance D1 L1 L2 L3 L4 L5±5 Mass


1050-750 LF 121 063 -A/-AA 2500 0.6 7205±185 48 2230±55 3070±60 605 655 1335 775-B/-AB 2500 0.3 -”- 48 -”- -”- 305 390 1035 755-C/-AC 2500 0 -”- 48 -”- -”- 5 90 735 730

1175-850 LF 121 061 -A/-AA 2500 0.6 7955±205 48 2470±55 3310±60 605 610 1335 830-B/-AB 2500 0.3 -”- 48 -”- -”- 305 335 1035 810-C/-AC 2500 0 -”- 48 -”- -”- 5 35 735 785-D/-AD 5000 0.6 -”- 38 -”- -”- 605 610 1335 935-E/-AE 5000 0.3 -”- 38 -”- -”- 305 335 1035 910-F/-AF 5000 0 -”- 38 -”- -”- 5 35 735 875

1300-1050 LF 121 071 -A/-AA 2500 0.6 10290±265 48 3225±54 4065±59 605 620 1335 1005-B/-AB 2500 0.3 -”- 48 -”- -”- 305 320 1035 985

1300-1150 LF 121 071 -C/-AC 2500 0.6 11600±300 48 3620±56 4460±61 605 620 1335 1055-D/-AD 2500 0.3 -”- 48 -”- -”- 305 320 1035 1035


Fig. 7.

8 mountingholes ø20

Rating plate data

Type Rated Phase- Dry Wet RoutineGOE voltage to-earth lightning switching test

UR voltage impulse impulse 1 min drykV, RMS UY LI SI kV, RMS


1050-750 362 1) 220 1050 750 505

1175-850 362 1) 220 1175 850 5301300-1050 420 245 1425 1050 6301300-1150 420 245 1425 1175 680





C1±10% (pF)

1050-750 0.6 / 0.3 / 0 480 960 430/383/3081175-850 0.6 / 0.3 / 0 540 950 420/366/3051300-1050 0.6 / 0.3 650 1050 575/5601300-1150 0.6 / 0.3 650 1175 575/545



0° -30° -60°

1050-750 13000 6500 4300 31001175-850 12000 6000 4300 31001300-1050 10000 5000 3000 15001300-1150 9000 4500 2500 -

Table 12. Mechanical loading GOE 1050 - GOE 13001) If the bushing is intended to be used at system voltage lower than300kV, dry L1 will not be included in the routine test. Please indicatethat in the order.

9


Type Catalogue Insulator Rated Flange CreepageGOE Number colour current extension distance L1 L2 L3 L4 L5±5 Mass

Brown/Light grey A mm mm mm mm mm mm kg

1550-1050 LF 121 072 -A/-AA 2500 0.6 10130±260 3225±54 3965±59 605 655 1585 1455-B/-AB 2500 0.3 -”- -”- -”- 305 355 1285 1420-C/-AC 2500 0 -”- -”- -”- 5 55 985 1385

1675-1175 LF 121 073 -A/-AA 2500 0.6 11700±300 3720±50 4460±55 605 630 1585 1635-B/-AB 2500 0.3 -”- -”- -”- 305 330 1285 1600-C/-AC 2500 0 -”- -”- -”- 5 30 985 1565

1675-1300 LF 121 073 -D/-AD 2500 0.6 13380±330 4220±50 5260±55 605 610 1585 1785-E/-AE 2500 0.3 -”- -”- -”- 305 310 1285 1750-F/-AF 2500 0 -”- -”- -”- 5 10 985 1715

1800-1300 LF 121 074 -A/-AA 2500 0.6 13380±330 4220±50 5260±55 605 610 1585 1785-B/-AB 2500 0.3 -”- -”- -”- 305 310 1285 1750-C/-AC 2500 0 -”- -”- -”- 5 10 985 1715



0° -30° -60°

1550-1050 16000 8000 4700 25001675-1175

1675-1300 13000 6500 4300 15001800-1300


Rating plate data


UR voltage impulse impulse 1 min drykV, RMS UY LI SI 50 Hz

kV, RMS kV, Peak kV, Peak kV, RMS

1550-1050 550 318 1550 1050 7501675-1175 550 318 1675 1300 7501675-1300 550 318 1675 1300 7501800-1300 550 318 1800 1300 800





C1±10% (pF)

1550-1050 0.6 / 0.3 / 0 660 1050 457 / 390 / 3421675-1175 0.6 / 0.3 / 0 730 1300 512 / 440 / 3801675-1300 0.6 / 0.3 / 0 790 1300 500 / 490 / 3801800-1300 0.6 / 0.3 / 0 800 1300 490 / 490 / 373


Fig. 8.

10


Type Catalogue Insulator Rated Flange CreepageGOE Number colour current extension distance L1 L2 L3 L4 L5±5 Mass


2100-1425 LF 121 081 -A/-AA 2500 0.6 16630±420 5220±52 6265±57 605 710 1955 2605-B/-AB 2500 0.3 -”- -”- -”- 305 410 1655 2555

2550-1550 LF 121 082 -A/-AA 2500 0.6 18320±460 5720±52 7065±57 605 640 1955 2760-B/-AB 2500 0.3 -”- -”- -”- 305 340 1655 2710-C/-AC 2500 0 -”- -”- -”- 5 40 1355 2650

2550-1600 LF 121 083 -A/-AA 2500 0.6 20000±500 6210±58 7555±63 605 640 1955 2915-B/-AB 2500 0.3 -”- -”- -”- 305 340 1655 2865-C/-AC 2500 0 -”- -”- -”- 5 40 1355 2805


Rating plate data


UR voltage impulse impulse 1 min drykV, RMS UY LI SI 50 Hz

kV, RMS kV, Peak kV, Peak kV, RMS

2100-1425 800 485 2100 1425 9702550-1550 800 485 2550 1550 10002550-1600 800 485 2550 1620 1000



0° -30° -60°

2100-1425 14000 7000 4000 1500

2550-1550 12000 6000 4700 11002550-1600





C1±10% (pF)

2100-1425 0.6 / 0.3 900 1550 552 / 5002550-1550 0.6 / 0.3 / 0 950 1675 574 / 522 / 4762550-1600 0.6 / 0.3 / 0 1000 1760 600 / 550 / 506


Fig. 9.

11

Connection detailsThe oil side connection can be made with either a draw-rodsystem or a draw-lead system. For the air side connectionthe same terminal studs are provided for both systems.When ordering, please specify the items stated below.

Draw rod system

The centre tube of the bushing is used as current conductor.The transformer leads are fitted with cable lugs, which arebolted to a bottom contact. This contact is drawn againstthe lower end of the bushing tube by a thin steel draw rod.The upper end of this rod is bolted to a spring device, whichconsists of two concentric tubes of different materials andis so designed that it gives the required contact load at alltemperatures.

Bottom contacts with 4 or 6 threaded holes for cable lugsare available. The bottom contacts are made of copper inone piece and have rounded edges, so that they may beused without any shield for low insulation levels.

At the level of the flange the draw rod is split into two parts.If required to meet the transport conditions, we can positiona joint at any desired level below the flange. This must bestated in the order. The lower part with contact end shieldcan then be secured to the cover during transport andstorage of the transformer. This system has the followingadvantages compared to other methods used for highcurrents:

• No hand holes required in the transformer tank.• The bushing tube is used as conductor.• No special supports required in the transformer as is the

case with plug contacts.• Perfect guiding of the bushing into the transformer.• The lower end shield may be fixed to the contact and will

thus be correctly positioned with respect to the lower endplate of the bushing (for contact with N1=6).

• No mechanical forces exerted on the leads from thetransformer windings at any time.

D2ø150

Outerterminal

Threaded hole M8for pulling wire

M16

25

Additional jointon request

Mountingflange

ø125

5065

N1 = 6N1 = 4

58 39

L5

H2

L2

60

H1

240

N1 = Number of holesM12, equipped with threadinsert with screw lock,depth 20, for cable lugs.

Fig. 10. Draw rod system. For all currents up to ratedcurrent of the bushing. Selection as per Table 21.

Common specificationsApplication: TransformersClassification: Oil impregnated paper, capacitance graded, outdoor immersed bushingAmbient temperature: +40 °C to -40 °C, minimum value acc. to temperature class 2 of IEC 137.Altitude of site: < 1 000 mLevel of rain and humidity: 1-2 mm rain/min. horizontally and vertically, as per IEC 60-1.Pollution level: According to specified creepage distance and IEC 815 1).Immersion medium: Transformer oil. Maximum daily mean temperature 90 °C. Maximum temporary oil temperature 115 °C.Oil level below bushing flange: Max. 30 mmMax. pressure of medium: 100 kPa over pressure.Markings: Conforming to IEC/ IEEE

For conditions exceeding the standard specification above, please consult ABB Components.1) IEC 815 "Guide for the selection of insulators in respect of polluted conditions."

Type of draw rod GOE type Cat. No.

Lower draw rod 1) 250-2550 LF 170 059Upper draw rod 2) 250-2550 LF 170 057

Table 21. Ordering particulars for draw rod system.1) Lower draw rod includes bottom contact, guiding cone and draw rod

up to bushing flange level.2) Upper draw rod includes the complete draw rod above mounting

flange level and the temperature compensation device.

12

Min. innerdiam. D1 Cond. Current, A Complete

D3 D9 of bushing area inner terminal Massmm mm mm mm2 IEC IEEE Cat. No. kg

01) 35 38 - - - LF 170 056 -A 3.215 35 38 50 205 500 -B 3.2

95 390 37030 35 38 150 615 540 -C 3.2

285 1000 830

40 45 48 450 1300 1100 -D 4.4600 1600 1360

01) 45 48 - - - -E 4.4

1) With pilot hole D=5

Table 24. Inner terminal.

Material D2 H2 Max. rated Cat. No. Massmm mm current, A kg

Al 60 125 2500 LF 170 073 -A 3Cu 60 125 4000 -B 8

Table 23. Outer terminal. Special outer terminals availableon request.

Fig. 11. Draw lead system, LF 170 056. For currents up to1000 A and 1600 A. Selection as per Table 22.

D2ø150

Outerterminal

H2 Threaded hole M8for pulling wire

350L2

End ofcable

D3D9

Draw lead system

Suitable copper terminals for flexible draw leads areavailable for currents up to 1600 A. The terminal systemconsists of a two-part cable connector with a hole forbrazing of the cable or cables. The two parts are screwedtogether in such a manner that normal tolerances in thecable and bushing lengths can be compensated. Theconnector is fastened by a hexagon nut to a copper plateplaced at the top of the bushing. The standard GOE outerterminal stud is placed on top of this plate.

Outer terminal

The outer terminal consists of a cylindrical stud. Themounting arrangements are the same for all GOE bushings,regardless of size, current rating and internal connectionsystem. All GOE terminal studs will thus fit any GOEbushing. Copper and aluminium studs are available.

The terminal stud assembly consists of a stud, a tighteningring, a gasket, bolts and washers. The electrical contactfunction and the sealing function are completely separated.

The stud is first fastened to the bushing top with 6 bolts,M10, which give the proper electrical contact. The contactsurface is located inside the gasket and is thus wellprotected from corrosion. Finally, the tightening ring withthe gasket is pressed against the stud by means of 6additional bolts, M8. The same type of terminal stud canalso be mounted at the bottom of the bushing but then theinsulating shield cannot be mounted in the normal manner.

22.

13

End-shieldsThe maximum stresses in the oil at the surface of the shieldinsulation and the parts surrounding the bushing must belimited to those values normal for insulated conductors andother similar components in the same transformer.

The withstand voltages in a specific case depend uponmany factors beyond the control of the bushing manu-

facturer. Therefore the configurations and distances givenbelow are only intended as guidelines.

ABB Components will also provide assistance with fieldcalculations to confirm the compatibility between thetransformer and our bushings.

Fig. 13. Recommended minimum distance A fordifferent shields and test voltages.

(kV) U(kV) LI

10002500

5001500 20001000500

00

Shield -U/-UP

0

500

1000

Amm

U = Power frequencyLI = Lightning impulse

Shield -X/-XPShield -V/-VP

No shield

Fig. 14. Mounting alternatives.

Shield mounted onthe bushing

Shield mounted on the draw rod bottomcontact. (Not possible for draw rod bottomcontact with N1 = 4. See page 11.)

Fig. 12. Recommendations for positioning.

D4D5 R2

R3H5

H4

H6R1

Earthed layer

45°Rmin 5

Edges withinthis area shouldbe rounded toRmin=5 mm

60°

A

A = Distance to flat surface e.g. tank or core clamp

ø125ø102

60°

60°20°

13

18

Bottom contactN1= 6

To be used Dimensions according to Fig. 12 (mm) Mass Epoxy PressboardShield with GOE D4 D5 H4 H5 H6 R1 R2 R3 kg Cat. No. insulated insulated (1

U 250-1300 262 174 265 170 90 492 30 8 2.1 LF 170 046 -U -UP

V 1550-1800 352 207 365 240 120 351 24 10 2.5 LF 170 046 -V -VPX 2100-2550 420 230 420 290 125 533 44 25 3.2 LF 170 046 -X -XP

Table 24. Insulated shield.1) All dimensions refer to the epoxy insulated shield, which is used as a base. The thickness of the pressboard is 3 mm for -UP and -VP,

and 5 mm for -XP.

14

Rated Current Short-time current Dynamic currentcurrent IEEE Ith Ith Id

IEC A 1 s 2 s peakA kA kA kA

2500 2100 100 100 2503150 2700 100 100 2505000 4250 100 100 250

Table 25. Rated current, short-time current and dynamiccurrent as defined in IEC 137, for draw rod and fixed bottomend terminal.

Current capacityThe rated currents specified in this catalogue are based onthermal tests and are in accordance with IEC 137 andapply to the built-in conductors of the bushings. The GOEbushings conform to the requirements of IEC 137 andIEEE for currents given in Table 25.

Short-time current

The rated thermal short-time current (Ith), as defined in

IEC 137 clause 5, is listed in Table 25 for draw rod and fixedbottom end terminal.

For draw lead of stranded copper with the area 100 mm2

the short-time current (Ith) is 9.6 kA for 1 second and6.8 kA for 2 seconds. For other areas the short-time currentis directly proportional to the area. The rated dynamiccurrent (Id) is 2.5 times the 1 second short-time current.

Overload capacity of bushings

If the conductor for the bushing is selected with 120 % ofthe rated current of the transformer, the bushing isconsidered to be able to withstand overload conditionsaccording to IEC 354 without further clarification or tests.This recommendation complies with IEC 137.

15

Ordering particularsWhen ordering please fill in the specification table below,or alternatively state the following:• Type and catalogue number for bushing.• Catalogue number for the outer terminal, or if a non-

standard terminal is requested: material, diameter D2and height H2.

• Specify draw rod or draw lead system.If a draw rod system is chosen, the number of threadedM12 holes in the bottom contact has to be specified(N1=4 or N1=6).If a draw lead system is chosen, the full cataloguenumber must be given.

• Catalogue number for insulated shield. (A shield isrecommended for BIL 450 kV and higher.)

• Other special requirements.

See the ordering examples:

Example 1:Bushing: GOE 650-500-3150-0.3-B,

LF 121 054-BOuter terminal: LF 170 073-A or -BInner connections: Draw lead, LF 170 056-AInsulated shield: Epoxy insulated, LF 170 046-U


LF 121 072-AOuter terminal: LF 170 073-A or -BInner connections: Draw rod, upper part LF 170 057,

lower part LF 170 059, N1=4(On request the lower part of thedraw rod can be sent separately atan earlier delivery date.)

Insulated shield: Pressboard coated, LF 170 046-VP


LF 121 071-BOuter terminal: Silver plated, D2=50, H2=100Inner connections: Draw rod, upper part LF 170 057,

lower part LF 170 059, N1=4(On request the lower part of thedraw rod can be sent separately atan earlier delivery date.)

Insulated shield: Pressboard coated, LF 170 046-VPOther requirements: Test voltage 690 kV

Tan δ over C2<1.0 %

Complete Designation

Type

Wet switching impulse, kV

Rated current, A

Length of flange extension, m

Code for colour of air side insulatorB = brown G = light grey

Example: GOE 1300-1050-2500-0.3-B

Nameplate with marking example.

1999

Transformer bushings, type GOHTechnical guide

2

This Technical guide has been produced to allow transformer manufacturers, and theirdesigners and engineers, access to all the technical information required to assist them intheir selection of the appropriate transformer bushing. The guide should be used inconjunction with the Selection guide to allow the optimum selection to be made.


The information provided in this document is intended to be general and does not coverall possible applications. Any specific application not covered should be referred directlyto ABB Components AB, or its authorized representative.



Wall bushingsGIS bushingsOn-load tap-changersMotor-drive mechanisms

3


Shed form ___________________________ 4Terminals ___________________________ 5Test tap _____________________________ 5

Testing _______________________ 5Test tap adapter ______________________ 5

Dimensions ___________________ 6

Electrical data _________________ 7Common specifications ________________ 7

Conductor loading ______________ 8

Connection ___________________ 9

Ordering particulars_____________ 9


4

DesignThe bushing is built up around a solid aluminium bolt whichserves as a conductor for both the current and for the heatlosses. Cooling flanges are milled directly in the conductor.

The upper insulator, lower insulator and mounting flangeare held between the end plates by spring pressures.Sealing is accomplished by oil-resistant rubber gaskets.

The radial seal at the bottom end consists of an O-ringmade in a special fluorocarbon rubber. This material isvery resistant to high-temperature transformer oil, and hasgood flexibility in the lower temperature range.

The annular space between the condenser body and theporcelain is filled with transformer oil. A gas-filled expansionspace is left at the top.

The oil level can be checked by means of a dipstick in theoil filling hole.

Both insulators are made in one piece of high qualityelectrical porcelain. The mounting flange is manufacturedof corrosion-resistant aluminium alloy.

The mounting flange is protected by painting with two-component primer and a grey-blue finishing coat of paint.

The bushings are delivered oil-filled and ready for use.

The bushing can be vertically or horizontally mounted. Ifthe bushing is horizontally mounted, special measureshave to be taken to ensure sufficient oil filling in thebushing and communication with an expansion space.Further information can be obtained on request.

Shed form

The shed form for all GOH bushings is of the anti-fog typewith alternating long and short sheds. For each pair ofsheds the ratio between nominal creepage distance andthe axial length is 3.35 and the ratio between protected andnominal creepage distance is 0.40.

According to IEC 815 the creepage factor C.F. is <3.0 andthe profile factor P.F. is >1.1.

For special customer demands regarding creepagedistance, other shed forms may be used.

Oil side terminal withcooling flanges

Spring device

Porcelain insulatoroil side

Oil side oil plug forconnection to transformer

Mounting flange

Air side oil plug forseparate expansion tank

Oil filling and venting holewith sealing plug M8

Porcelain insulatorair side

Lifting eye

Outer terminal plates

Fig. 1. Transformer bushing type GOH.

Fig. 2. Shed form.

goh_0013

goh_0002

5

Terminals

The contact surfaces are plated with a tin/zinc alloy. Theoil end is provided with threaded holes. The threads areprovided with self locking thread inserts. The oil end hastwo contact surfaces milled directly in the conductor. Theair end is equipped with four drilled flat terminals, weldedto the conductor.

Test tap

The outer conducting layer of the condenser body isconnected to an insulated test tap on the flange. Duringoperation the test tap cover must be screwed on in orderto earth the outer layer to the flange. The max. test voltageof the tap is 2 kV, 50 Hz for 1 minute. Max. service voltageis 600 V.

Fig. 3. Oil end.

Fig. 5. Test tap adapter, 2769 531-A.

TestingDuring the manufacture and on its completion the bushingis subjected to a number of routine tests. A tightness testis carried out on the assembled bushing after the finaldrying and impregnation. The test is made with an oiloverpressure of 180 kPa (1.8 bar) for 12 hours at ambienttemperature. No sign of leakage is allowed.

Each bushing is subjected to a final electrical routine test.The test is made at room temperature with the bushingsubmerged in oil. Capacitance and tan � are measured insteps up to the power frequency withstand voltage, whichis maintained for one minute.

Capacitance and tan � are also measured at decreasingvoltage at the same voltage levels as before the oneminute test.

Measurements for detection of internal partial discharge(PD measurements) are also made. These measurementsare carried out at the same time as the power frequencywithstand test. PD measurements are made in steps up tothe full test voltage and down.It is always demonstrated that the PD value is max. 5 pCat test voltage equal to the rated system voltage.


Test tap adapter

For testing, a special test adapter is required for permanentconnection of the test tap to the measuring circuits.

Fig. 4. Test tap.

goh_0003 (780643)

goh_0010

goh_0011

6

DimensionsThe dimensions in axial direction are the same for standard GOH 170/10, 170/16 and 170/25.

Fig. 6. Dimensions.

Type Min. creepage distance (mm) Cantilever withstand load (N)GOH Total Protected Operation 1 min. test

170/10 760 300 1500 10000170/16 760 300 1500 10000170/25 760 300 1500 10000

goh_0004

7

Electrical dataThe table below states the values according to IEC 137. Type tests, however, have shown that ANSI insulationclass 34.5 kV is fulfilled.

NominalRating Routine test Short time current Dynamic current capacitanceNominal Phase-to- Dry lightning Wet power betweenvoltage earth voltage impulse frequency 1 min dry Reference Ith Ith Id conductor

Type Ur 1.2/50 AC 50 Hz current1) 1 s 2 s Peak and test tapGOH kV, RMS kV, RMS kV kV, RMS kV, RMS kA kA kA kA C1 ±10 % (pF)

170/10 36 36 200 75 80 10 1002) 1002) 2502) 400170/16 36 36 200 75 80 16 1002) 1002) 2502) 570170/25 36 36 200 75 80 25 1002) 1002) 2502) 765

1) See Conductor loading2) Highest value according to IEC 137.

Common specificationsApplication: TransformersClassification: Oil impregnated paper, capacitance graded, outdoor immersed bushing.Ambient temperature: +40 °C to -40 °C, minimum value acc. to temperature class 2 of IEC 137.1)

Altitude of site: < 1 000 mLevel of rain and humidity: 1-2 mm rain/min. horizontally and vertically as per IEC 60-1.Pollution level: According to specified creepage distance and IEC 815.2)

Immersion medium: Transformer oil.1)

Oil level below bushing flange: Max. 25 mmMax. pressure of medium: 100 kPa over pressure.Mounting angle: Vertical or horizontalMarkings: Conforming to IEC/ IEEE

For conditions exceeding the standard specification above, please consult ABB Components.1) See Conductor loading2) IEC 815 "Guide for the selection of insulators in respect of polluted conditions."

8

Fig. 7. Current capacity

t1 = Hot spot temperature ofthe bushing lead

tA1 = Air temperature

t0 = Surrounding oiltemperature

tA2 = Mean daily ambient airtemperature

The name plate value of current, also given inthe designation of the GOH bushing, is areference current and not the permissiblecurrent for the bushing. The permissiblecurrent is very much dependent upon thetemperature conditions around the bushing.Knowing the temperature of the surroundingtransformer oil and the ambient temperatureof the air side of the bushing, one can calculatethe permissible current by using the diagramin Fig. 7. This diagram is verified by thermaltests which are in accordance with IEC 137.

t1 Highest temperature (hot spot) allowedon the bushing. In normal service thisshould not exceed 105 °C.

tA1 Ambient temperature on air side of thebushing. This depends greatly on whetherthe bushing is enclosed or not, and ifenclosed, on how the enclosure isdesigned.

t0

Temperature of the oil around thebushing. With forced cooling t0 is oftenrelatively low compared to the maximumallowed temperature given in transformerstandards.

tA2 Mean daily ambient temperature aroundthe transformer.

�t Top oil temperature rise for thetransformer.

Example:

I = 11 kAtA2 = 30 °C�t = 55 Kt0 = tA2 + �tt0 = 30 + 55 = 85 °C

tA1 = 45 °Ct1 = 105 °Ct1 - t0 = 105 - 85 = 20 Kt1 - tA1 = 105 - 45 = 60 K

The permissible current is obtained from thediagram.

For GOH 170/10 9.3 kAFor GOH 170/16 15.2 kAFor GOH 170/25 23.0 kA

GOH 170/16 will in this case be chosen.

Conductor loading

Current, kA

goh_0005

9

ConnectionThe connection to the aluminium terminals of the bushingshall be made by means of flexible connectors. No specialtreatment is needed for the tin/zinc plated contact surfaces.

In order to maintain a sufficient contact pressure, thescrews should be furnished with strong spring washers.

Large flat washers must also be used in order to limit thespecific load. For M12 and 1/2" UNC, a flat washer with aminimum thickness of 3 mm and a minimum outer dia�� Detailed instructions andrecommendations for connecting are available in theinstallation and maintenance guide 2750 515-85.

Ordering particularsWhen ordering, please state:• Type and catalogue number for bushings.• Additional accessories or modifications.• Test required, in addition to the normal routine tests.• Test tap adapter, if required.

Designation Catalogue No. Insulator colour on air side

GOH 170/10 LF 126 007-A BrownLF 126 007-B Light grey



Recommendations for positioningThe maximum stresses in the oil at the surface of theshield insulation must be limited to those values normal forinsulated conductors and similar components in the sametransformer.

The adjacent recommendations are intended as guidelines when complete calculations are not carried out.

Nameplate withmarking example. Fig. 8. Recommendations for positioning.

3) Area for uninsulatedearthed details

Max D (See Fig. 6)

goh_0014

goh_0006

Wall bushings, type GSA-AATechnical guide

2

This Technical Guide has been produced to allow designers and engineers access to allthe technical information required to assist them in their selection of the appropriate WallBushing. The Guide should be used in conjunction with the Selection Guide to allow theoptimum selection to be made.


The information provided in this document is intended to be general and does not coverall possible applications. Any specific application not covered should be referred directlyto ABB Components AB, or its authorised representative.



Transformer bushingsGIS bushingsOn-load tap-changersMotor-drive mechanisms

3

Table of ContentsStandards ___________________ 4

Design ______________________ 4Features and benefits _________________ 4Test tap ____________________________ 5Test tap adapter _____________________ 5

Testing ______________________ 5Routine testing ______________________ 5Type tests __________________________ 5Special tests ________________________ 5

Transportation and storage ______ 5

Dimensions __________________ 6

Ratings _____________________ 7Common specifications ________________ 7

Connection details _____________ 8Outer terminal _______________________ 8Solid rod conductor ___________________ 8Separate terminal plate with bolts ________ 9Arcing horns ________________________ 9

Conductor loading _____________ 10Short-time current ____________________ 10


Ordering particulars ____________ 11

4

StandardsThe GSA bushing is specified and tested according toIEC 137 and IEEE C57.19.00/01 in applicable parts.

DesignGSA-AA is a Resin Impregnated Paper (RIP) bushing withSilicone Rubber (SiR) insulator. The condenser body isdirectly covered with silicone rubber to give a compact andlightweight bushing that contains no oil or other liquids orgases.

The GSA bushings are produced by winding a crêpedpaper web onto a mandrel, with aluminium foil inserts forelectrical field control. The body is vacuum impregnatedand cured giving a partial discharge free bushing with lowtan δ (dissipation factor). After curing, the body is machinedand the flange is attached.

The insulator is perfectly bonded to the RIP body in apatent applied for process, giving protection from theenvironment.

The conductor is fixed to the top piece with a divided ring(patented by ABB). A solid rod of copper or aluminium isused as conductor.

The outer terminal is available in a number of standardconfigurations in aluminium and copper, but can also bemodified to suit any connection need.

The flange and the top piece are protected from corrosion.The standard colour of the mounting flange and of theinsulator is RAL 7035, light grey.

Outer terminal

Silicone rubberinsulator

Solid conductor

RIP body

Fig. 1. Wall bushing type GSA-AA.

gsa_0002

Test tap

Mounting flange

Features Benefits

Solid Reduced risk for fire, any mounting angle possible, oil leakage from the bushingeliminated, no monitoring of pressure and oil level.

Non-brittle materials Protection of people and equipment, easy handling, safe transport, and highearthquake withstand.

Light weight, compact Easy handling, and low life cycle environmental impact.

Silicone rubber insulator Superior electrical performance, washing normally not needed.

5

TestingRoutine testing

The bushing is routine tested according to above standards.The tests include measurement of partial dischargequantity, tan δ, capacitance, dry power frequency voltagewithstand test. A visual inspection is performed.

An individual routine test protocol is delivered with eachbushing from ABB Components.

Type tests

Type tests have been performed according to abovestandards and summaries are available on request.

Special tests

Tests not specified by the above standards have also beenperformed and summaries are available on request.

Test tap (re-designed)

The outer conducting layer of the condenser body isconnected to an insulated test tap on the flange. Duringoperation the protective cap must be screwed on to earththe outer layer to the flange. The maximum test voltage is2 kV, 50 Hz for 1 minute. The maximum service voltage is600 V.

Fig. 2. Test tap.

gsa_0042

Transportation and storageThe bushing shall be surrounded by a sealed moisture-proof wrapping material together with a drying agentduring transportation and storage.

The supplied protective wrapping shall not be opened if thebushings are intended to be stored. The protective wrappingcan be re-sealed, or a similar sealed moisture-proofwrapping can be used, together with a drying agent.

6

Dimensions

Fig. 3. Dimensions.

gsa_0009

gsa_0040

D8

L5

L7L2

L1

LL8

D1

D2

ø15 x n1

D5

D6

D7

90°

2

M12

T

R2

7°

R8

R8 R2

R5

R5

7°

18°

24

60

18°

33

60

D9


Dimensions in mmArcing Condenser Top

Rated Net Indoor Outdoor Top distance Flange body Centre pieceType current mass Total side side part outdoor height outer hole diameterGSA A Cat. No. (kg) L L1 L2 L5 L7 L8 D1 D2 D9

73 4000 LF 130 073-CD 33 1679 910 769 56 647 101 136 89 160

123 2000 LF 130 123-BD 62 2509 1320 1189 56 1067 101 136 51 160

7

RatingsRatings GSA-AA 73 123

Rated voltage IEC (kV) 72.5 170Rated phase-to-earth voltage IEC (kV) 42 98Insulation class IEEE (kV) 69 115Rated line-to-ground voltage IEEE (kV) 44 88Basic Insulation Level (kV) 1) 350 550Rated current (A) 4000 2000Rated frequency (Hz) 50/60 50/60Temporary over voltage (kV) 73 170Wet power frequency (kV) 140 230Routine test 1 minute dry (kV) 140 230Nominal capacitance between conductorand test tap C1 ±10 % (pF) 756 426

1) Equal to dry lightning impulse withstand voltage.

Common specifications

Application: WallsClassification: Resin impregnated paper, capacitance graded, outdoor-indoor / indoor bushingAmbient temperature: +40 °C to -40 °C, minimum value acc. to temperature class 2 of IEC 137Altitude of site: < 1 000 mLevel of rain and humidity: 1-2 mm rain/min. horizontally and vertically, acc. to IEC 60-1, and 5 mm/min as per IEEE.Pollution level: According to specific creepage distance and IEC 815 1)

Angle of mounting: Horizontal - verticalTest tap: Test tap with 4 mm male contact pinCapacitance C2 of test tap: < 5 000 pFLength of earthed sleeve: According to table. Other dimensions upon request.Arcing horns: Optional equipmentConductor: Solid conductorMarkings: Conforming to IEC/IEEE

For conditions exceeding the standard specification above, please consult ABB Components.

1) IEC 815 "Guide for selection of insulators with respect to polluted conditions".

Min. gasket Cantilever loadsurface Hole Insulator Number Flange Creepage distance Max. permitted loadinginner diam. circle Flange sheds of holes thickness total protected perpendicular to the terminalD5 D6 D7 D8 n1 T (mm) (mm) (N) Test (N)

150 250 290 270 8 15 2323 1000 2000 4000

150 250 290 270 8 15 3913 1700 2500 5000

8

Connection detailsThe outer terminal needs to be specified in each case. The outer terminal is then used together with a solid rod.

Fig. 5. Solid rod conductor.

Outer terminal

The outer terminal is available in a number of standardconfigurations. Any other configuration can be quotedupon request.

Outer terminal for GSA73-AA

Stud diameter Cat. No. MassMaterial (mm) LF 170 079 (kg)

Aluminium 60 -BA *) 3.030 -BB *) 2.2

Copper 60 -BC *) 7.630 -BD *) 5.0

*) Standard

Outer terminal for GSA123-AA

Stud diameter Cat. No. MassMaterial Plating (mm) LF 170 079 (kg)

Aluminium - 60 -A *) 2.3- 30 -B *) 1.6

Copper - 60 -C *) 6.2- 30 -D *) 3.6Tin 60 -E 6.2Tin 30 -F 3.6Silver 60 -G 6.2Silver 30 -H 3.6

*) Standard

125140

Fig. 4. Outer terminal.

Solid rod conductor

The conductors are produced from copper or aluminiumsolid rods ending in an outer terminal for the indoor side.

Solid copper conductor

Catalogue Number Bushing Mass Stud diameter(kg) (mm)

LF 170 081 -ABCD GSA73-AA 92.5 60-BBCD - " - 91.0 40-CBCD - " - 90.0 30

-ADBD GSA123-AA 44.0 40-BDBD - " - 43.0 30

Solid aluminium conductor

Catalogue Number Bushing Mass Stud diam.(kg) (mm)

LF 170 081 -DBCD GSA73-AA 28.6 60-EBCD - " - 28 40-FBCD - " - 27.8 30

-CDBD GSA123-AA 13.4 40-DDBD - " - 13.2 30

gsa_0005

Terminal stud

Divided ringO-ring

Tightening ring

125

D

Dgsa_0016

D1D2

9

Arcing horns

Arcing horns of galvanised steel can be mounted on thebushing. The arcing horns are available for stud withø 30 mm.

The lower rod is fastened onto the flange with one of thefixing screws and the upper rod by means of a bracket onthe outer terminal.

The gap distances for standard arcing horns are shown inthe table. Other gap distances on request.

Separate terminal plate with bolts

The separate terminal plate is available for stud withø 30 mm, and used for connecting the bushing to the lineconductor.

Material Cat. No.

Aluminium LF 170 014-A

Copper alloy LF 170 021-A

Fig. 6. Separate terminal plate with bolts.

Fig. 7. Gap distances.

Bushing K C Htype mm mm mm

GSA 73 400–620 315 112

GSA 123 620–960 315 114

gsa_0011

C

K

H

10

Short-time current

The rated thermal short-time current (Ith) is calculatedaccording to IEC 137.

Rated Short-time current(Ith) Dynamiccurrent Area kA, rms current(Id)

Conductor A mm2 1 s 2 s kA, peak

Solid rodØ 49 mm Cu 2000 1886 100 96 240

Solid rodØ 49 mm Al 1300 1886 100 71 177

Solid rodØ 87 mm Cu 4000 5944 100 100 250

Solid rodØ 87 mm Al 3150 5944 100 100 250

Conductor loadingThe GSA bushings fulfil the temperature rise testrequirements according to IEC and IEEE for the currentsbelow:

Rated current Rated Permissibleof bushing voltage Conductor current, IEC(A) (kV) (A)

1300 AC/DC 123 Solid rod, Al Ø 49 mm 1300

2000 AC/DC 123 Solid rod, Cu Ø 49 mm 2000

3150 AC/DC 73 Solid rod, Al Ø 87 mm 3150

4000 AC/DC 73 Solid rod, Cu Ø 87 mm 4000

Nameplate withmarking example.

Ordering particularsWhen ordering, please state:• Type and catalogue number for bushing.• Catalogue number for conductor.• Catalogue number for outer terminal.• Additional accessories or modifications.• Test required, in addition to the normal routine tests.

Recommendations for positioningThe bushing is intended for any mounting angle.

Fig. 8. Recommendations for positioning

gsa_0015

Max. 230 mm withoutreducing the rating

No.Ur/Uy 73/69 kV Ir 4000 A 50/60 HzLI / SI / AC 350 / - / 160 kVM 33 kg L 910 mm 0-90 °C1 pF Tan δ %C2 pF Tan δ %

ABB Components Ludvika, SwedenLF130073-CDGSA73-AA/4000

1ZVN460100-C

2 Tapchanger

1ZSE 5492-104 Language enRev. 4, 1997-03-30

ABB Components

On-Load Tap-ChangersType UZ

Technical Guide

L37034

Manufacturer’s declarationThe manufacturer ABB Components AB

SE-771 80 LUDVIKASweden

Hereby declares that

The products On-load tap-changerstypes UZE and UZF

with motor-drive mechanismtype BUF 3

comply with the following requirements:

By design, the machine, considered as component on a mineral oil filled power transformer, complieswith the requirements of

• Machinery Directive 89/392/EEC (amended 91/368/EEC and 93/44/EEC) and 93/68/EEC(marking) provided that the installation and the electrical connection be correctly realized by themanufacturer of the transformer (e.g. in compliance with our Installation Instructions) and

• EMC Directive 89/336/EEC regarding the intrinsic characteristics to emission andimmunity levels and

• Low Voltage Directive 73/23/EEC (modified by Directive 93/68/EEC) concerning the built-inmotor and apparatus in the control circuits.

Certificate of Incorporation:

The machines above must not be put into service until the machinery into which they have beenincorporated have been declared in conformity with the Machinery Directive.

Date 1997-02-10

Signed by .........................................................................Olof Heyman

Title Manager of Division for Tap-Changers

This Technical Guide has been produced to allow transformer manufacturers, and their designersand engineers, access to all the technical information required to assist them in their selection ofthe appropriate on-load tap-changer and motor-drive mechanism. The guide should be used inconjunction with the Selection Guide and the Design Guides, to allow the optimum selection to bemade.

The technical information pertaining to on-load tap-changers and motor-drive mechanismsmanufactured by ABB Components has been divided and is contained in separate documents,with one document for each type.

The information provided in this document is intended to be general and does not cover allpossible applications. Any specific application not covered should be referred directly toABB Components AB, or its authorized representative.

ABB Components AB makes no warranty or representation and assumes no liability for theaccuracy of the information in this document or for the use of such information. All information inthis document is subject to change without notice.


De-energized tap-changersTransformer bushingsWall bushingsGIS bushingsTransformer cooling equipment

Table of ContentsGeneral Information ___________ 4

Design Principles _____________ 6

On-Load Tap-Changer _____________________ 6Epoxy-Resin Moulding __________________ 6Selector Switch________________________ 6Transition Resistors ____________________ 7Change-over Selector __________________ 7Geneva Gear _________________________ 7Tap-Changer Tank _____________________ 8Oil Conservator _______________________ 8Accessories for the Tap-Changer __________ 9Special Applications ____________________ 9

Motor-Drive Mechanism ____________________ 9Accessories for the Motor-Drive Mechanism _ 9Motor-Drive Mechanism Cubicle __________ 9Degree of Protection ___________________ 9

Principles of Operation _________ 10

On-Load Tap-Changer _____________________ 10Switching Sequence ____________________ 10Selector Switch________________________ 10Change-over Selector forPlus/Minus Switching ___________________ 11Change-over Selector forCoarse/Fine Switching __________________ 11Through Positions _____________________ 11

Motor-Drive Mechanism ____________________ 12Operational Description _________________ 12Local Control _________________________ 14Remote Control _______________________ 14Through Positions _____________________ 14Step-by-Step-Operation _________________ 14Protection against Running-Through _______ 14Contact Timing ________________________ 14

Characteristics andTechnical Data________________ 15

On-Load Tap-Changer _____________________ 15Type Designation ______________________ 15Rated Phase Step Voltage _______________ 15Standards and Testing __________________ 15Rating Plate __________________________ 15Mechanical Life _______________________ 16Insulation Levels_______________________ 16Sound Level __________________________ 16Contact Life __________________________ 16

Short-circuit Current Strength _____________ 17Highest Phase Service Voltage Acrossthe Regulating Winding _________________ 17Rated Through-Current _________________ 17Maximum Rated Through-Current _________ 17Occasional Overloading _________________ 17Oil Temperature _______________________ 17Motor-Drive Ambient Air Temperature ______ 18Tie-in Resistors _______________________ 18Conductors from the Windings ____________ 18Cable Lugs ___________________________ 18

Standard Version of Motor-Drive Mechanism ___ 19Control ______________________________ 19Wiring Connection _____________________ 19Protection ____________________________ 19Indication ____________________________ 19

Optional Accessories ______________________ 20Anti-Condensation Coverage _____________ 20Outlet _______________________________ 20Extra Heater __________________________ 20Hygrostat ____________________________ 20Tropical Version _______________________ 20

Extra Multi-Position Switches _______________ 20

Design, Installationand Maintenance______________ 21

On-Load Tap-Changer with Motor-DriveMechanism _____________________________ 21

Design Differences between the UZE andUZF On-Load Tap-Changers _____________ 21Schematic Diagrams ___________________ 22Drying _______________________________ 26Painting _____________________________ 26Weights _____________________________ 26Oil Filling_____________________________ 26Installation ___________________________ 26Maintenance __________________________ 26Pressure Relay ________________________ 27

General Description _________________ 27Design ____________________________ 27Operation _________________________ 27Function Pressure ___________________ 27Testing ___________________________ 27

Dimensions, On-Load Tap-ChangerType UZE ____________________________ 28Dimensions, On-Load Tap-ChangerType UZF ____________________________ 29On-Load Tap-Changers Types UZE and UZFwith Accessories _______________________ 30Oil Conservator for UZF _________________ 31

General InformationThe UZ types of on-load tap-changers operatesaccording to the selector switch principle, that is, the tapselector and diverter switch functions are combined inone.

The UZ types of on-load tap-changers are mounted onthe outside of the transformer tank. All of the equipmentnecessary to operate the tap-changer is contained in asingle compartment, with the motor-drive mechanismattached to the outside.

Because the UZ types are designed for mounting on theoutside of the transformer tank installation proceduresare simplified and the overall size of the transformer tankcan be reduced.

Standard tanks are designed for the UZ types. Thestandard tanks have a number of standard flanges to getgreat flexibility for accessories. Standard accessories arepressure relay and oil valve. See Figs. 1a and 1b.A great number of extra accessories can be ordered.See Figs. 2a and 2b.

As a design option, the UZ types can be supplied withoutthe tank. This gives the transformer manufacturer theflexibility to design the tap-changer tank as an integralpart of the transformer tank.

4

Fig. 1a. On-load tap-changer type UZEwith standard accessories.

L37037 Fig. 1b. On-load tap-changer type UZFwith standard accessories.

L37023

Fig. 2a. On-load tap-changer type UZEwith extra accessories.

L37036 Fig. 2b. On-load tap-changer type UZFwith extra accessories.

L37024

5

Pressure relay

Change-overselector

Fixed contact

Moving contactsystem

Transition resistor

Shielding-ring

Insulating shaftSelector switchunit

Test connection

Test valve

Fig. 3. Design principle of on-load tap-changer type UZF

Connection tooil conservator

Cover for accessto conductors Lifting eye

Motor-drivemechanism

Attachment flangeto transformer tank

Terminal

Oil valve

On-load tap-changer tank

Geneva gear

Gasket

Connectionfor oil filterunit

Front cover

Design PrinciplesOn-Load Tap-ChangerThe tap-changer is built-up by using single-phase units,each identical, mounted in the openings on the rear ofthe compartment. Each single-phase unit consists of anepoxy-resin moulding, a selector switch, transitionresistors and, in most cases, a change-over selector.

Epoxy-Resin Moulding

The one-piece moulding provides a bushing between thetransformer and the tap-changer. The conductors aremoulded into position to connect the fixed contacts to theterminals for connection to the transformer windings.Also moulded into the unit are bearings for the selectorswitch and the change-over selector.

The terminals on the moulding are numbered accordingto the schematic diagrams, see the section ”Design,Installation, and Maintenance” contained in this Guide.

6

Fig. 5. Moving contact systemFig. 4. One phase of an on-load tap-changertype UZ

L036257

Selector Switch

The selector switch consists of fixed contacts and amoving contact system.

The fixed contacts are mounted onto a bracket which isscrewed onto the terminals previously moulded into theepoxy-resin moulding. Each fixed contact has twocontact paths, one for the main moving contact and onefor the moving switching contacts.

The moving contact system consists of the main contact,the main switching contact and two transition contacts.The system is built as a rigid unit rotated by a commondrive-shaft. In the service position the load current iscarried by the moving main contact, which consists oftwo contact fingers, pressed onto the fixed contact bysprings. The moving switching contacts and the transitioncontacts are made as rollers, see Fig. 5, which moveover the knife-like fixed contacts. The making andbreaking takes place between the fixed and movingswitching contacts.

The switching contacts are made of copper/tungsten, orin the case of tap-changers for lower currents, thecontacts are made of copper.

Transition Resistors

The resistors are made from spirally wound wiremounted on insulating bobbins. They are connectedbetween the moving main contact and the transitioncontacts.

Change-over Selector

The change-over selector is used for reversing theregulating winding or for changing connection in thecoarse/fine regulation.

The selector consists of a moving contact and two fixedcontacts. The moving contact is fixed to a shaft and issupported by a bearing in the moulding. The current iscarried by the four contact fingers of the moving arm, andtransferred to the fixed contacts. The change-overselector does not make or break the current duringoperation.

Fig. 7.

7

Fig. 6. Selector switch

Geneva Gear

The Geneva gear principle is used to change a rotarymotion into a stepping motion. Drive is transmitteddirectly from the motor-drive mechanism to the Genevagear. The Geneva gear operates the selector switch andthe change-over selector. The Geneva gear is also usedto lock the moving contact system when it is in position.

8

Tap-Changer Tank

A standard tank is designed for each size of UZE andUZF. The standard tanks have a number of standardflanges intended for a great variety of accessories.Flanges that are not used are mounted with greybluecovers. Adapter flanges can be bolted on if the sizes ofthe standard flanges not are suitable.

Standard accessories are pressure relay and oil valve.A great number of extra accessories can be ordered.Dimensions and accessories for the tap-changer tanksare shown on pages 28 to 31.

The tap-changer tank can be bolted (standard) or weldedto the transformer tank.

A non-standard tank can also be ordered, but to a higherprice and a longer delivery time than the standard tank.

Oil Conservator

Normally the oil compartment of the tap-changer shall beconnected to a conservator, separated from the oil of thetransformer. If the transformer oil is to be supervised bygas-in-oil analyses, the conservator for the tap-changeroil should have no connection to the conservator of thetransformer on either the oil or the air side.

For use on a sealed tank transformer a special versioncan be supplied, in which UZE includes the volumeneeded for oil expansion, an oil level indicator and abreather. UZF needs an own conservator, which can besupplied mounted on the top of the tap-changer tank.

The oil pressure difference between the transformer andthe tap-changer should not exceed 10 kPa or 1.2 metresoil column. If the pressure difference is between 10 and70 kPa a reinforced barrier should be ordered. For theversion for sealed tank transformers the pressuredifference is allowed to be up to 70 kPa (10 Psi) and forthat version the reinforced barrier is delivered.

The set point for the pressure relay connected to the UZtank is 50 kPa (7 Psi). For further information, see page27 or pamphlet 1ZSE 5492-151.

When the on-load tap-changer operates, arcing occurs inthe tap-changer. To avoid contamination of thetransformer oil, the tap-changer is housed in its own tankseparated from the transformer oil. All components thatmake and break the current during the operation of thetap-changer are located in the tap-changer tank.

The tap-changer tank is separated from the transformertank by a vacuum-proof barrier, designed to withstand amaximum test pressure of 100 kPa, at a maximum of60 oC. The barrier and the gasket are oil-tight, whichmeans that they are designed and routinely tested for apermissible air leak at each leak location of 0.0001 cm3/s,at a pressure difference of 100 kPa and a temperature of20 oC. This safely guarantees the contaminated tap-changer oil to remain separated from the transformer oil.It should be noted that the barrier has not been designedto allow for a simultaneous over-pressure on one side,and vacuum on the other. All models are supplied with anoil valve, for filling and draining.

TC_00267Fig. 8b. UZF standard tankTC_00267Fig. 8a. UZE standard tank

9

Special Applications

ABB Components should be consulted for all specialapplication tap-changers, such as sealed tank trans-formers or transformers for use with arc-furnaces andconverters.

Accessories for the Tap-Changer

Accessories for the tap-changer are shown on dimensionprints on pages 30 and 31.

For a list of accessories see the Selection Guide orconsult ABB Components.

Motor-Drive MechanismThe motor-drive mechanism provides the drive to allowthe tap-changer to operate. As the name implies, drive isprovided from a motor through a series of gears and onto a spring energy storage device, which when fullycharged, operates the tap-changer via a drive shaft.Several features are incorporated within the mechanismto promote long service intervals and reliability.

For a detailed operating description, see the section”Principles of Operation” contained in this guide.

Accessories for the Motor-DriveMechanism

Accessories for the motor-drive mechanism aredescribed on page 20.

For a list of accessories see the Selection Guide orconsult ABB Components.

Motor-Drive Mechanism Cubicle

The cubicle is manufactured from steel and is welded tothe outside of the tap-changer tank. The door, which canbe padlocked, forms a cap around the mechanism toallow easy access to all the working parts. Vents, withfilters, and a heater are fitted to ensure that themechanism remains operative in varied climates.

Degree of Protection

The motor-drive mechanism has passed a test for IP 54according to IEC 529.

Fig. 9. Motor-drive mechanism

Principles of OperationOn-Load Tap-ChangerSwitching Sequence

The switching sequence is designated the symmetricalflag cycle. This means that the main switching contact ofthe selector switch breaks before the transition resistorsare connected across the regulating step. This ensuresmaximum reliability when the switch operates withoverloads.

At rated load the breaking takes place at the first currentzero after contact separation, which means an averagearcing time of approximately 6 milliseconds at 50 Hz.The total time for a complete sequence is approximately50 milliseconds. The tap change operation time of themotor-drive mechanism is approximately 3 seconds perstep.

Selector Switch

The switching sequence when switching from position 1to position 2 is shown in the diagrams of Figs. 10a-ebelow. The moving contact H is shown as one contactbut consists in fact of two, the main contact and the mainswitching contact. The main contact opens before andcloses after the main switching contact.

10

Fig. 10a.

Position 1. The main contact H is carrying the loadcurrent. The transition contacts M1 and M2 are open,resting in the spaces between the fixed contacts.

Fig. 10b.

The transition contact M2 has made on the fixedcontact 1, and the main switching contact H has broken.The transition resistor and the transition contact M2 carrythe load current.

Fig. 10c.

The transition contact M1 has made on the fixedcontact 2. The load current is divided between thetransition contacts M1 and M2. The circulating current islimited by the resistors.

Fig. 10d.

The transition contact M2 has broken at the fixedcontact 1. The transition resistor and the transitioncontact M1 carry the load current.

Fig. 10e.

Position 2. The main switching contact H has made onthe fixed contact 2. The transition contact M1 hasopened at the fixed contact 2. The main contact H iscarrying the load current.

For plus/minus and coarse/fine switching, the change-over selector is used.

Change-over Selector for Plus/MinusSwitching

The switching sequence, when the change-over selectorR changes over for plus/minus switching, is shown in thediagrams of Figs. 11a and 11b. The contact arm of theselector switch has reached the fixed contact 12 afterswitching from the fixed contact 11. The fixed contact 12is wide enough to cover the whole distance between twopositions of the selector switch. It is connected to the endof the main winding.

The contact arm of the selector switch has travelled on tothe contact 12, and the change-over selector R is in off-load condition. The load current goes directly from themain winding through the contact 12 and out through thecurrent collector at the centre of the contact arm. Theupper end of the regulating winding is still connected tothe main winding. This is the service position.

The contact arm of the selector switch has travelledfurther on the contact 12 without any breaking or makingof the current. At the same time the contact arm of thechange-over selector R, has travelled from contact B tocontact C, through which the lower end of the regulatingwinding has been connected to the main winding. This iscalled a through position, see Through Positions.

11

Fig. 11a. Service position

Fig. 11b. Through position

Through Positions

A so called ”Through Position” is a position the tap-changer has to pass without changing the ratio of thetransformer. Figs. 11a-b shows how the change-overselector is operated, while the selector moves over thedouble fixed contact. The extra position has the samenumber on the scale of the position indicator, togetherwith a letter, e.g. 12A. There might be need for morethrough positions over the operating range if the numberof taps of the winding is less than the number ofmechanical positions of the selector. The motor-drive willautomatically pass the through positions.

Change-over Selector for Coarse/FineSwitching

The mechanical switching is exactly the same as for theplus/minus switching, the electrical switching is differenthowever. The change-over selector connects ordisconnects the coarse winding.

Motor-Drive Mechanism

12

Fig. 12.

Operational Description

Drive is via a V-belt from the motor transmitted through asystem of spur gears to the drive pin of the cam wheel.The spring energy storage device is charged by this pin.

During the rotation the cam wheel drive pin tensions thesprings. When the drive pin reaches its lowest positionon the cam wheel the springs are released, and with theassistance of the flywheel, the drive is transmitted to theoutgoing drive shaft and the driving disc.

Motor

V-belt

Limit switch

Outgoing drive shaft

Driving disc

Mechanical limit stop

Cam wheel

Spur gears

Maintaining contact

Drive pin

Flywheel

The driving disc operates the Geneva gear within thetap-changer. The flywheel is stopped by a disc brake,which also operates the starting contact.

The outgoing drive shaft, via a chain, drives the Genevagear of the indicating device. The indicating deviceconsists of the mechanical position indicator, themechanism for operating the electrical and mechanicallimit stop, and the position transmitter.

The maintaining contact is operated by the cam wheel.

Disc brake

Indicating device

Spring energy storage device

13

Fig. 13. Circuit diagram

The following is a detail list for the circuit diagram inFig. 13 and the contact timing diagram in Fig. 14.

1 Control selector switch, local/remote2 Control switch, raise/lower3 Contactor, raise4 Contactor, lower5 Starting contact6 Maintaining, interlocking and auxiliary contact7 Motor8 Limit switch:

8.1 Lower tap position8.2 Upper tap position

11 Interlocking switch, open when hand crank is fitted12 Anti-condensation heater14 Position transmitter, potentiometer15 Continuation contact19 Protective motor switch21 Contactor, step-by-step operation36 Cabinet light37 Switch, door operated43 Time relay, running-through protection51 Emergency stop push button

Lower operation

Raise operation

Protective earth

Local control

Crank

Remote control

14

Contact

Fig. 14. Contact timing diagram

Tap pos Tap pos Tap pos Tap pos

Lowerlimitpos

Upperlimitpos

Lower operationRaise operation

T1 Starting rangeT2 Spring charging startsT3 Spring releaseT4 Selector switch operatesT5 Stopping range

Note:The numbered references under the followingsections are to the circuit diagram in Fig. 13 and thecontact timing diagram in Fig. 14.

Local Control

Control selector switch (1) in position LOCAL. Raiseimpulse is given by control switch (2). Contactor (3) isthereby energized and will remain so by starting contact(5:1-2) and its own holding contact. The motor (7) startsrunning and soon the maintaining contact (6:3-4) closesand takes over control of the motor contactor (3). Thebrake is released and the starting contact (5:1-2) opens.The springs are set and will be released when fullycharged, and operate the tap-changer. Maintainingcontact (6:3-4) opens and the contactor disconnects themotor. The brake is applied, the starting contact (5:1-2)closes and the tap change operation is completed. Thelowering operation is carried out in a similar manner.

Remote Control

Control selector switch (1) in position REMOTE. Thesignal for the operation is then received from the controlcircuits for raise and lower impulses connected toterminals as shown in Fig. 13. Local operation is notpossible when switch (1) is in position REMOTE, andremote operation is not possible in position LOCAL.

Through Positions

A so called ”Through position”, is a position the tap-changer has to pass without changing the ratio of thetransformer. These positions are passed automatically.The continuation contact (15) bridges the maintainingcontacts (6:3-4 and 6:1-2) via auxiliary contacts on raisecontactor (3) at through positions. In this way thecontactor (3) raise, or (4) lower, is kept energized andthe motor will automatically make another operation.

Step-by-Step-Operation

Step-by-step relay (21) connected so that only one tapchange operation is obtained each time the raise/lowerswitch is operated.

Protection against Running-Through

A relay (43) stopping the motor-drive mechanism in caseof a a failure of the step-by-step control circuit whichwould cause a running-through of the motor-drivemechanism. The relay energizes the trip coil in theprotective motor switch (19).

Contact Timing

The contact timing diagram, Fig. 14, shows the contactsequences for one change of tap position for raise andlower directions.

Characteristics and Technical Data

Fig. 16.

15

Step voltage

0 100 200 300 400 500 600 ARated through-current

2000

1500

1000

500

0

Tap-changer with: max 11 positions, linearmax 23 positions, plus/minusmax 23 positions, coarse/fine

Fig. 17.

On-Load Tap-ChangerType Designation

U Z . . . XXX/YYYTypeE Insert uprightF Insert inclined

Type of switchingL LinearR Plus/MinusD Coarse/Fine

Type of connectionN Three-phase star pointT Three-phase fully insulatedE Single-phase (option)

Impulse withstand voltage200 kV, 250 kV, 380 kV, 550 kV, 650 kV

Maximum rated through-current150 A, 300 A, 600 A

Number of positionsLinear switching: max 17 positionsPlus/Minus switching: max 33 positionsCoarse/Fine switching: max 29 positions

Rated Phase Step Voltage

The maximum allowable step voltage is limited by theelectrical strength and the switching capacity of theselector switch. It is therefore a function of the ratedthrough-current as shown in Figs. 16 and 17 below.

Standards and Testing

The UZ types of on-load tap-changers fulfill the requi-rements according to IEC standard, publication 214.

The type tests include: The routine tests include:Contact temp. rise test Check of assemblySwitching tests Mechanical testShort-circuit current test Sequence testTransition impedance Auxiliary circuitstest insulation testMechanical tests Vaccum testDielectric test Final inspection

Rating Plate

Step voltage

1500

1000

500

00 100 200 300 400 500 600 A

Rated through-current

Tap-changer with: 13–17 positions, linear25–33 positions, plus/minus25–29 positions, coarse/fine

Fig. 15. Example of rating plate fm_00214

Mechanical Life

The mechanical life of the tap-changer is based on anendurance test. The test showed that the mechanicalwear was negligible, and that the tap-changer was stillmechanically sound after one million operations.

Insulation Levels

Dielectric tests are carried out according to IEC 214,Clause 8.6. The test object was immersed in clean trans-former oil with a withstand value of at least 160 kV/cm.

In table 1, withstand levels are indicated as lightningimpulse – power frequency withstand voltages.

Sound Level

During tap-changing the equivalent continuous soundpressure level is about 65 dB (A) measured one metrefrom the tap-changer.

Contact Life

The predicted contact life of the fixed and movingcontacts of the selector switch, is shown as a function ofthe rated through-current in Fig. 18. The values arecalculated from the results of the service duty tests.For step voltages equal to or below 40 V at 50 Hz andequal to or below 50 V at 60 Hz the predicted contact lifeis always 500 000 operations.

16

Fig. 21. Coarse/fine switchingFig. 20. Plus/minus switchingFig. 19. Linear switching

Fig. 18. Predicted contact life

0 100 200 300 400 500 600A

500 000

400 000

300 000

200 000

100 000

0

Rated through-current

Number ofOperations

UZE/F Insulation levels kV Permissible service voltage between phasesOn-load tap-changer type to earth between phases for fully insulated design UZE.T and UZF.T 1)

fully insulated 1) kV

200/... 200–70 250–95 38250/... 250–95 250–95 52380/... 380–150 440–165 80550/... 550–230 600–230 123650/... 650–275 650–275 145

1) Class II according to IEC 214. Clause 8.6.2

Between Between the first Between any Acrosselectrically and the last electrically non- change-over

Type of Number of adjacent contacts, contacts, a2 adjacent contacts, selector, c1switching positions a1 (Fig. 19) (Figs. 19–21) a3 (Fig. 19) (Figs. 20 and 21)

Linear 7–11 110–30 220–60 220–6013–17 110–30 220–60 200–60

Plus/minus 11–23 110–30 220–60 220–60 220–6025–33 110–30 220–60 200–60 220–60

Coarse/fine 13–23 110–30 220–60 220–60 220–6025–29 110–30 220–60 200–60 220–60

Table 1. Insulating levels

300 A-600 A150 A 50 Hz 60 Hz

17

Short-circuit Current Strength

The short-circuit current strength is verified with threeapplications of 2 seconds duration, without moving thecontacts between the three applications. Each applica-tion has an initial value of 2.5 times the rms value.

Max rated Three applications ofthrough current 2 seconds durationA rms A rms

150 7000300 7000600 8000600 1) 12000

1) Reinforced performance

Table 2

Highest Phase Service Voltage Acrossthe Regulating Winding

The table below, Table 3, shows the highest permissiblephase service voltage for different types of switching anddifferent number of positions.

Highestservice

Type of Number of voltageswitching positions Insulation across kV

Linear –17 Regulating winding 22

Plus/minus –29 Regulating winding 2231–33 Regulating winding 15

Coarse/fine –29 Fine regulating winding 17.5–29 Coarse regulating winding 17.5–29 Fine and coarse regulating 35 1)

winding

1) For 3-phase star point design BIL 200 22 kVBIL 250 30 kV

Table 3

Rated Through-Current

The rated through-current of the tap-changer is thecurrent which the tap-changer is capable of transferringfrom one tapping to the other at the relevant rated stepvoltage, and which can be carried continuously whilstmeeting the technical data in this document.

The rated through-current determines the dimensioningof the transition resistors and the contact life.

The rated through-current is stated on the rating plate,Fig. 15.

Maximum Rated Through-Current

The UZ models are designed for maximum ratedthrough-currents of 150 A, 300 A or 600 A.

Occasional Overloading

If the rated through-current of the tap-changer is not lessthan the highest value of tapping current of the tappedwinding of the transformer, the tap-changer will notrestrict the occasional overloading of the transformer,according to IEC 354 (1991), ANSI/IEEE C57.92 andCAN/CSA-C88-M90.

To meet these requirements, the UZ models have beendesigned so that the contact temperature rise over thesurrounding oil, never exceeds 20 K at a current of 1.2times the maximum rated through-current of the tap-changer.

The contact life stated on the rating plate, and given inthis guide, is given considering that overload currents ofmaximum 1.5 times the rated through-current occurduring a maximum of 3% of the tap-changer operations.

Overloading in excess of the above results in increasedcontact wear and shorter contact life.

Oil Temperature

The temperature of the oil in the on-load tap-changershall be between -25 and +80 oC for normal operation,as illustrated below.

Fig. 22. On-load tap-changer oil temperature

+80

oC

+901)

2)

3)

4)

5)

1) No operations allowed

2) Emergency overloading.The on-load tap-changer will notrestrict the occasional overloadingof the transformer according to thestandards in section OccasionalOverloading above.

3) Normal operating range

4) For operation within this range,the viscosity shall be between2-800 m2/s (=cst)

5) Operation with de-energizedtransformer only

fm_00215

0

-25

-40

Motor-Drive Ambient Air Temperature

The ambient air temperature requirements for the motor-drive mechanism are shown in Fig. 23. The normalope-rating range is between -40 and +60 oC.

Tie-in Resistors

If the service voltage and the winding capacitances aresuch that the recovery voltage of the change-overselector exceeds 40 kV, it must be limited to this value orlower, by means of a tie-in resistor. The tie-in resistorscan be placed in the tap-changer tank for UZE and UZFmodels BIL 200, 250 and 380 kV. For UZE and UZFmodels BIL 550 and 650 kV the tie-in resistors areplaced in the transformer tank. There is usually a needfor tie-in resistors for UZ models, BIL 550 and 650 kV,when delta-connected and placed in the line ends of thewindings.

Design information on tie-in resistors is provided in aseparate document, On-Load Tap-Changer Tie-inResistors, 5492 0030E-28.

Conductors from the Windings

The temperature of the conductors connected to theterminals on the back of the on-load tap-changer mustnot exceed 30 K over the surrounding oil.

Cable Lugs

The Cat. No. and requiredquantity should be orderedseparately according to thetables below.

Hole diam. For cable Cat. No. MassØ mm area mm2 kg

11 50 LL114 003-A 0.1013 70 -B 0.1115 95 -C 0.1317 120 -D 0.1419 150 -E 0.1521 185 -F 0.16

18

Fig. 23. Motor-drive mechanism ambient air temperature

Required quantity of cable lugs per tap-changer

Linear Plus/minus Coarse/fine

Number 3-phase 3-phase 3-phase 3-phase 3-phase 3-phaseof star fully star fully star fullypositions point insulated point insulated point insulated

7 22 24 – – – –9 28 30 – – – –

11 34 36 22 24 – –13 40 42 25 27 28 3015 46 48 28 30 31 3317 52 54 31 33 34 3619 – – 37 39 37 3921 – – 37 39 40 4223 – – 43 45 43 4525 – – 43 45 46 4827 – – 46 48 49 5129 – – 52 54 52 5431 – – 52 54 – –33 – – 58 60 – –

oC

-45-50

fm_00216

1) The motor-drive mechanism must beshaded from sun radiation by screens.It must be specially equipped if theambient temperature exceeds +70 oC.

2) Normal operating range.(Normal heater shall operate.)The temperature inside the cabinetmust not exceed +75 oC.

3) Extra 250 W heater should be used.

4) Extra 250 W heater and anti-condensation coverage should be used.

5) ABB Components should be consulted.

1)

2)

3)

4)

5)

-40

0

+60

Standard Version of Motor-Drive MechanismControlControl selector switch, local/remoteControl switch, raise/lowerHandcrank for manual operation

Wiring ConnectionThe wiring is of grey polyvinylchloride-insulated, strandedwire. Type and data see table below. Every wire ismarked with figures corresponding to terminal numbers.All external connections are made to disconnectibleterminals of thermosetting resin.Type and data see table below.Short circuit protection (fuses) for motor, control andheater supplies, if required, should be installed in thecontrol cabinet or other separate compartment.

ProtectionProtective switch for the motor with thermal overloadrelease and magnetic overcurrent release.Limit switches – in both control and motor circuits.Mechanical end stops.Interlocking contact in the control circuit to preventelectrical operation during manual operation.Interlocking contacts in raise and lower control circuits toprevent operation in wrong direction of rotation (withwrong phase sequence).Motor contactors are electrically interlocked.Protection against running-through in case of a failure ofthe step-by step control circuit.Emergency stop push button.

IndicationMechanical position indicatorDrag hands for max. and min. position indicationTap change in progress indicating red flagOperation counterPosition transmitter (potentiometer) for remote positionindication, 10 or 50 ohms per step.

19

Special versionSubject Standard version Alternative version at an additional price

Motor voltage 220-240/380-420 V, 208/360 V, 3-phase, 60 Hz 120 V, 240 V, 1-phase, 60 Hz3-phase, 50 Hz 220-240/380-420 V, 3-phase, 60 Hz 110 V, 220 V d.c.

440-480 V, 3-phase, 60 Hz OptionalCurrent 1.2/0.7Rated output 0.18 kWSpeed 1370 rev/min

Voltage for control circuit 220-230 V, 50 Hz 110 V, 120 V, 240 V, 50 Hz 110 V, 220 V, d.c.220-240 V, 60 Hz 110 V, 120 V, 208 V, 60 Hz Optional

Voltage for heater 220-240 V 110-127 V, 260 V Optional

Mechanical position lowest position middle position Optionalindicator marked 1 marked N (Normal position)

Terminal blocksNumber of terminalssupplied 33-Phönix URTK/S Ben

61 A, 500 V, A.C.acc. to VDECross sectional area: 0.5-6 sqmm

Max. number that can 130 - Phönix UK 4be accomodated 120 - Weidmüller SAK 4

100 - Phönix URTK/S Ben 48 - General Electric EB-25 48 - Critchley S 300 (OBA)

Cabling Type H07V2-K, 1.5 sq mm, 750 V Optional90 oC

Test voltage on control circuits 2 kV (50 Hz, 1 min)

Anti-condensation heater(Functions without extraheater down to -40 oC) 50 W Additional 250 W

Operating time approx. 3 seconds

Number of turns peroperation of the handcrank 20

Degree of protection of cabinet IEC 529, IP 54

20

Optional AccessoriesAnti-Condensation Coverage

The motor-drive cabinet inside can be supplied with ananti-condensation coverage.

Outlet

Socket outlet according to DIN or ANSI. Prepared forsocket outlet, i.e. holes are cut out in the panel andcables are wired to the panel for the outlet.

Extra Heater

Extra heater, 250 W, with thermostat and switch for e.g.use in arctic climate.

HygrostatFor tropical climate the heater can be controlled by ahygrostat.

Tropical VersionThe motor-drive mechanism can be equipped to meetthe requirements for humid tropical climate and desertconditions.

Type Symbol Number of contact rows

1 Extra position transmitter 1

2 Break before make 1

3 Make before break 1

4 Voltage transformer switch (Furnace) 1

5 Step switch for parallel control 2

6 Follower switch for parallel control 2

Note:Master switch for parallel control is a break beforemake multi-position switch.Maximum 10 extra contact rows can be accomodated.If more than 4 extra contact rows are ordered a specialdrive system for the switches is required (extra price).

Extra Multi-Position Switches

Design, Installation and Maintenance

Fig. 26.

21

UZE UZF

Transformer winding

Intermediate flange

Connection cover

Transformer leads

Connection cover

On-Load Tap-Changer withMotor-Drive MechanismDesign differences between the UZEand UZF On-Load Tap-Changers

The basic design difference between the UZE model andthe UZF model is the inclining of the active part within

Fig. 24. UZFRT 650/600 seen from theconnection side

Fig. 25. The UZF-design makes the connectionof the transformer leads to the Tap-Changer easy

L037022 L034275

the UZF tank to allow easier access to the terminals.Access to the terminals is via a connection cover on thetop of the tank. Both UZE and UZF are completely filledwith oil and have no gas/air cushion.

Transformer tank

Schematic Diagrams

Table 4 shows all the basic connection diagrams for theUZE and UZF series of on-load tap-changers. The basicconnection diagrams illustrate the different types ofswitching and the appropriate connections to thetransformer windings. The diagrams illustrate the

Linear Plus/Minus Coarse/Fine

Max Regulating Steps 16 32 28Max Voltage Positions 17 33 29

6 Regulating Steps

Number of Loops 6Tap Positions (Electrical) 7

8 Regulating Steps


10 Regulating Steps

Number of Loops 10 5Tap Positions (Electrical) 11 11

22

connections with the maximum number of turns in thetransformer winding connected in position 1. The tap-changer can be connected in such a way that position1gives a minimum effective number of turns in the trans-former winding with the tap-changer in position 1.

23

Linear Plus/Minus Coarse/Fine

12 Regulating Steps

Number of Loops 12 6 6Tap Positions (Electrical) 13 13 13

14 Regulating Steps


16 Regulating Steps


18 Regulating Steps


Plus/Minus Coarse/Fine

20 Regulating Steps


22 Regulating Steps


24 Regulating Steps


26 Regulating Steps


24

Plus/Minus Coarse/Fine

28 Regulating Steps


30 Regulating Steps


32 Regulating Steps


Table 4. Basic connection diagrams for the UZE and UZF series of on-load tap-changers

25

Drying

Drying of the tap-changer is not normally necessary. Ifthe tap-changer is to be subjected to a drying process,ABB Components should be consulted.

Painting

The tap-changer tank and the motor-drive mechanismcabinet can be supplied with various types of painting.The standard painting consists of a rust protective primerboth inside and outside, and a finishing coat inside thetap-changer tank and the motor-drive mechanismcabinet.

26

On-load tap-changer Approx. weight in kg

Tap-changer Required TotalType designation without oil oil

UZELN, 200/150, 300, 600 725 500 1225UZELT, 250/150, 300, 600 700 500 1200UZEDN, 380/150, 300, 600 930 950 1880UZEDT, 550/150, 300, 600 1100 1250 2350UZERN, 650/150, 300, 600 1100 1250 2350UZERT

UZFLN, 200/150, 300, 600 750 400 1150UZFLT, 250/150, 300, 600 720 400 1120UZFDN, 380/150, 300, 600 900 750 1650UZFDT, 550/150, 300, 600 1100 1050 2150UZFRN, 650/150, 300, 600 1100 1050 2150UZFRT

Example underlined in the table above: UZFRT 550/300

Table 5

Oil Filling

For the correct oil filling procedure, consult theappropriate Installation and Commissioning Guide.

Installation

For installation instructions, consult the appropriateInstallation and Commissioning Guide.

Maintenance

The UZ range of on-load tap-changers have beendeveloped over many years to provide a maximum ofreliability. The simple and rugged design gives a servicelife that equals the service life of the transformer. Aminimum of maintenance is required for absolutelytrouble-free operation. The only parts that require main-tenance during the service life are the contacts that mayneed to be replaced, and the motor-drive mechanism.

Maintenance is easy to carry out since the designprovides for quick and easy access and inspection. Thefront-cover is just removed after the oil has been drained,providing access to the entire selector switchmechanism.

An annual inspection should be carried out to read thecounting device. These readings are used to determinewhen overhaul is due. Overhaul shall normally be carriedout every seven years, and consists of checking thedielectric strength of the oil, filtering the oil, and checkingcontact wear according to the Maintenance Guide. Themotor-drive mechanism should also be checked andlubricated, and the pressure relay checked.

The Maintenance Guide should be consulted if you needfurther information.

As an option, the tap-changer may also be deliveredready with a finishing coat outside. Special painting willbe quoted for on request.

Weights

Table 5 contains the weights of all the models in the UZrange of on-load tap-changers. The motor-drivemechanism and the oil volume is included in the overallweight.

}}

27

Pressure Relay

General Description

Fig. 27.

General Description

Protection for the on-load tap-changer is provided by apressure relay which is mounted on the tap-changertank. In the event of an over-pressure in the tank, therelay will trip the transformers main circuit breakers. Aftera pressure relay trip, the tap-changer must be openedand carefully investigated according to the Repair Guide.Faults, if any are located, should be repaired before thetap-changer is energized.

Design

The pressure relay is mounted on a three-way valve. Onthe other two outlets of the valve there is a connectionflange on one side, and a connection for test equipmenton the other, see Fig. 27.

The pressure relay housing is made of copper-freealuminium alloy and is externally coated with an enamel.A stainless steel model can be provided on request.

��

ABB Components

30 54 67

Cable gland~200~35

110

~155

15

32

11

One single-poleswitching contact

Two single-poleswitching contacts

NO NC C NO NC C64 66 65 61 63 62

NO NC C61 63 62

Connection fortest equipment

The pressure relay has been pre-set by themanufacturer. The pressure relay is sealed to avoidunauthorized entrance. The electrical connection shall bemade to the terminal block inside the pressure relayhousing. These measures are done to ensure a safefunction. The pressure relay is designed for one or twoswitching elements.

Operation

When the pressure acting on the face of the pistonexceeds the spring load of the piston, the piston willmove and activate the switching element.

The operation time is less than 10 ms. The operationtime is the time it takes from the pressure in the tap-changer tank exceeds the function pressure, until thepressure relay gives a stable signal for operation of thetransformer main circuit breakers.

Function Pressure

The function pressure (trip pressure) is 50 kPa (7 Psi) ifthe oil level is less than 4 metres above the level of thepressure relay. Pressure relay with higher functionpressure can be delivered on request.

Testing

At commissioning of the transformer and for testing thepressure relay, the instructions in the Installation andCommissioning Guide should be consulted.

Breaking capacity Withstand voltageVoltage Resistive Inductive between open

load load contacts

110 V DC 0.8 A 0.2 A < 40 ms

125 V DC 0.6 A 0.15 A < 40 ms

220 V DC 0.4 A 0.1 A < 40 ms

125 V AC 5 A 5 A cos ϕ > 0.4

250 V AC 2.5 A 2.5 A cos ϕ > 0.4

Table 6.

2 kV, 50 Hz, 1 min

LR

LR

LR

fm_00213

Dimensions, On-Load Tap-Changer,type UZE

All dimensions are in millimetres unless otherwise stated. It should be noted that the dimensions may change withspecific models.

28

Fig. 28. Dimensions, on-load tap-changer, type UZE standard tank with standard accessories. TC_00179

Type BIL Dimensions (mm)

UZE kV A A1 B B1 B2 H H1 P P1 R

Three-phase 200 130 75 1200 1500 700 1000 1060 770 775 1140250 115 75 1200 1500 700 1000 1060 770 775 1140380 100 90 1560 1885 730 1100 1255 840 855 1530550, 650 90 60 1850 2140 695 1300 1430 810 885 1750

Table 6. Dimensions, on-load tap-changer, type UZE

P1

PB1

A

B2

Max 135o

B

R

A1

Opening 300 x 100

H1H

Dimensions, On-Load Tap-Changer,type UZF

All dimensions are in millimetres unless otherwise stated. It should be noted that the dimensions may change withspecific models.

29

Fig. 29. Dimensions, on-load tap-changer, type UZF standard tank with standard accessories. TC_00180

B B2

Type BIL Dimensions (mm)UZF kV A A1 B B1 B2 H H1 H2 P P1 P2 R

Three-phase 200 130 75 1200 1500 700 1000 1050 160 825 835 60 1140250 120 75 1200 1500 700 1000 1050 160 825 835 60 1140380 140 70 1600 1905 710 1100 1145 155 850 860 120 1530550, 650 95 40 1900 2160 665 1300 1295 105 855 925 140 1750

Table 7. Dimensions, on-load tap-changer, type UZF

B1A1 P

H

H1

P2

H2

P1

A

Max135o

Opening 300 x 100

R

30

On-Load Tap-Changer, type UZE with Accessories (standard and options)

Fig. 30. On-load tap-changer, type UZE with accessories. TC_00181

Fig. 31. On-load tap-changer, type UZF with accessories. TC_00181

On-Load Tap-Changer, type UZF with Accessories (standard and options)

Oil level indicator(with or without alarm)

Cable box for alarmedoil level indicator

Valve for oil filling,draining and filtration

Pressure relay

Pressure reliefvalve Valve for oil

filtration

Pressure relief valve Valve for oil filtration

Thermoswitch housing

Valve for oil filling,draining and filtration

Flange for oil conservator,or breather

Dehydrating orone way breather

Pressure relay

Flange for oilconservator

Thermoswitch housing

Oil Conservator for UZF

TC_00182Fig. 32. Dimensions, oil conservator for on-load tap-changer, type UZF

515L

31

UZF BIL DimConservator kV L

200, 250 625380 1090550, 650 1500

Table 8. Dimensions, oil conservator for on-load tap-changer, type UZF

645

Dehydratingbreather

Cable box for alarmedoil level indicator

Oil conservator for UZF(only when ordered)

Oil level indicator(with or without alarm)

1ZVN460100-C

3 Cooling Equipment

3.1 Fans

Transformer Cooling FansFE063

DB-TR-007 - GB

��

��

��

��

��

��

��

��

�� !� �! ��"#$%&'(� ��%

�"��"��

#�$�"��$��%��"�� )*+��,�-�� .�/��0��12�� .� ��

"� � �� 2��$3��.��.� �� .��

��"4 �� '(��5%6(7�

#��0�� -8"393�&'/

#��"��9�� 2��

��

��

�

�� !

�"��

� �� . ��:��-8"393%(%'�/�� *�;��

0�� . ��:��2�� <�;&(( �

=��

�� -<�;&(( /�>��?�� . ��

��

�� !@ ��'((,A%(B�CD2E(1:!@��' (,A%(B�CD2 (1:

�� 8"393 ((!'�%-"9�!'�%/

��

�� ?�� .�� %�� 2�� 2!�� .� �� 2'�� .��F ��E��

=�� .��.�� .�� ?� ��

�� 2��

�� !"�#��$�� %&!��'(�� %!!!��)

�� .�� &�$��!�� '��"(��%�� .�� .� ��.��"��2�� .�� .� �� G�� "� �� 2 ��.��2�� '��)�!��

��

��

!@�� CD �� H��DH��

��

>% ��>� ��,% ��,� ��0% �� I0� ��

�� !�"�� *(J�� K�� J�%'��G�% � ��

*+!�,

#��$��

�� .�� ;

��

�� #�� .� �� .�� .�� . ��

�� .�� 8"3'E !E ��C�� "#$ !J''2 G �� %-G�� /�"� ��2�� .�� ;

� ��

��.�� .� � �� 6�� .�� -��" � �� "�/� �� .�� .�� 2 �� .�� ;

� ��

�� .�� .�� C�� I�� .�� 8"3 ( E%�� %�

�� I��?��.�� .�� .�� .�� . �� .�� .��

#�� %��"" ��)"$�"� $��(��&��$��%��&��"� $��(��&��

��.�� .�� .�� .��-�� 2��8"3'E !EG ��%��/�� !�4��.��

�-��

#��

$�%&�

�� '

��() *�+�� ,-��

��

��()*�+�� ,-��.!��

#��$��

��'��%��&��"� $��(��&��(%��"�&��"� ��"�*�"� $��(��+"' �� "�!

L�� .�� .�� .��-�� /2��.�� .��.�� .�� .�� .�� 8"3'E !EG ��%�� "" ��"""�

�� .�� .��2��.�� .�� I�� ""�� 2�� 2�� .�� .�� 6�4��

��.�� .��.�� I�� """��.��'�42�� 2�� .�� .�� %�E�4��

��'��%��"� $��"" ��&��4 �� .�� 2��.��;

�� %�� J�4��.��;

��

�� .�� 2��.��2�� .��

��.�� .�� ",�

0

��)/* ��"�� "��,��"��0��-��

��(�)))* 1�"��"�� 0��

��(�))* .�� 0��"��"��

��

��!�!� ��

��"�"��

��"�"��

0

1

2

dB

��!�!� ��

��

��"

��"

�#"

��"

dB"

$!��

�

%��!� ��

��

� &

��"�"��

�" �" &"� �""

84 12 16 20 24dB

1 2 5 10 15 20 250

5

10

15

dB

�

�

�

�

�

Difference in level of two sound sources

��

2��

%��&��

��

,!�� -��. ��! /��0

�9( !�#8;�'"�! E(C (1: %�6&((

�9( !�#8;�'"�! E(C (1: %�6&(%

��?�,�� G�� 3�� #�� #� �� .�� .��

1: , �� *0 �4-�/ �� !@'((,A%(B� &�( ! 6J( (� JJ '2! �9( !�#8;�'"�! %�6&((

!@'((,A%(BD JE( �2' '( (2' & %2' �9( !�#8;�'"�! %�6&((!@�!(,A%(B� JE( �2' '( (2' & �2' �9( !�#8;�'"�! %�6&((!@'%E,A%(B� &�( ! 6J( (2 JJ !2 �9( !�#8;�'"�! %�6&(%!@'%E,A%(BD JE( �2' '( (2' & %2� �9( !�#8;�'"�! %�6&(%!@�!(,A%(B� JE( �2' '( (2' & �2% �9( !�#8;�'"�! %�6&(%

�� !@' (,A%(B� %(J( !2 &J( %2(E 6( '2! �9( !�#8;�'"�! %�6&((!@' (,A%(BD 6�( �2J '( (26 & %2' �9( !�#8;�'"�! %�6&((!@� E,A%(B� 6�( �2J '( (26 & �2' �9( !�#8;�'"�! %�6&((!@' (,A%(B� %(E( !2E &'( % 6( !2 �9( !�#8;�'"�! %�6&(%!@' (,A%(BD J&( �2 �( (2E & %2� �9( !�#8;�'"�! %�6&(%!@� E,A%(B� J&( �2 �( (2E & �2% �9( !�#8;�'"�! %�6&(%

�� .�� .�� .�� ?�� G�� -:�� I��/2�� 2�� 8"3�'% !� ��-"#$E6(%/�G�� 'B��JB�

Ziehl-Abegg AGHeinz-Ziehl-StraßeD-74653 KünzelsauTelefon ++49 (0) 7940 / 16-0Telefax ++49 (0) 7940 / 16-300E-mail [email protected]://www.ziehl-abegg.de

DB-

TR

-007

- Tra

nsfo

rmer

Coo

ling

Fans

FE0

63 -

01/

02

��2%3'

��

��

��((�6 %� �. ��:�� 8"3E(& % �� <�;&((

��G�� E

��"��$��

'� ��'��

��.�� = ��

�� .�� =�� < �� 8�� $��

1��:�� ! % 'E

,�� ' ��E � ((((�6E!J6

,�� ' ��E � EJ(,�� '� �� ! ((

((�6E!6(,�� '� �� ! EJ(

(��)�� &��* �� &��*

��(��

��(�� (�2 ��(��

��(�' ��(�'

$$��$

��'�

%�$�� %�$�

��'

��'�

1ZVN460100-C

3 Cooling Equipment

3.2 Radiators

ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam

Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 1 of 5


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 2 of 5


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 3 of 5


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 4 of 5


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 4 of 5


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 5 of 5

1ZVN460100-C

4 Current Transformer

1ZVN460100-C

5 Other Accessories 5.1 Pressure Relay

5.2 Pressure relief valve

5.3 Winding temperature indicator

5.4 Oil temperature indicator

5.5 Oil level indicator

5.6 Bucholz Relay

5.7 Dehydrating breather

5.8 Rapid Pressure Rise Relay

Pressure relay for on-load tap-changers

Technical information

Table 2. Function pressureTable 1. Technical data - Micro-switch

General descriptionProtection for the on-load tap-changer is provided by a pressurerelay which is mounted on the tap-changer oil compartment. Inthe event of an overpressure in the tap-changer oil compartment,the pressure relay will trip the transformer main circuit breakers.

DesignThe pressure relay is mounted on a three-way valve. On the othertwo outlets of the valve there is a connection flange on one side,and a connection for test equipment on the other, see fig.

The relay is made of copper-free aluminium alloy and is externallycoated with an enamel. A stainless steel model can be providedon request. Degree of protection IP66.

The function pressure (set point) has been set by the manufacturerin accordance to the requirements for each application.

The electrical connection shall be made to the terminal blockmounted onto the pressure relay.

The pressure relay is designed for one or two switching elements(micro-switches). The micro-switch is hermetically sealed andfilled with nitrogen with over-pressure, and separated from theconnection space with a sealed cap.

Piston

NO NC C NO NC C64 66 65 61 63 62

NO NC C61 63 62

Switching contact - micro switch

Connection fortest equipment

~200

One single-poleswitching contact

Two single-poleswitching contacts

~155

Adjusting nut

Spring

��

ABB Components

OperationWhen the pressure acting on the face of the piston exceeds thespring load of the piston, the piston will move and activate theswitching element. See fig.

The function time is less than 15 ms in the temperature range of-40 °C to +80 °C, with a pressure increase of 20-40 MPa/sec. Thefunction time is the time from the pressure in the on-load tap-changer oil compartment exceeds the adjusted set point of thepressure relay until the pressure relay gives a stable signal foroperating the main circuit breakers.

Function pressureThe value of the adjusted function pressure (set point) dependson the distance (H) between the pressure relay and the oil levelin the oil conservator.

Further information in the Technical, Installation & Commissioning,Maintenance and Repair Guides for each type of on-load tap-changer.

Mounting detailsThe following parts are supplied together with the pressurerelay: studs M10x40 (4x), nuts M10 (4x), washers 10x22x2 (4x)and O-ring 44.2x55.6 (1x).

675430

~35

110

32

15Pr 22.5

11

Distance H Type of OLTC Function pressurein metres (set point)

H < 4 UZ 50 kPa (7 psi)

4 ≤ H < 7 UZ 100 kPa (14 psi)

H < 7 UB, UC 100 kPa (14 psi)

7 ≤ H < 10 UZ, UB, UC 150 kPa (21 psi)

10 ≤ H < 14 UB, UC 200 kPa (28 psi)

Breaking capacity Withstand voltageVoltage Resistive Inductive between open

load load contacts

110 V DC 0.8 A 0.2 A < 40 ms

125 V DC 0.6 A 0.15 A < 40 ms

220 V DC 0.4 A 0.1 A < 40 ms

125 V AC 5 A 5 A cos ϕ ≈ 0.4

250 V AC 2.5 A 2.5 A cos ϕ ≈ 0.4

2 kV, 50 Hz, 1 min

LR

LR

LR

1ZS

E 5

492-

151

en,

Rev

. 3, 2

000-

11-1

5

Printed in Sweden by Globe, Ludvika, 2000

ABB Components ABSE-771 80 Ludvika, SWEDENTel.+46 240 78 20 00, Fax +46 240 121 57E-mail: [email protected]/transmission

Manufacturer:BETA B.V., Rijswijk, The Netherlands

ABB LTD. Km 9, National High Way 1A, Hoang Mai, Hanoi, Vietnam

Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 1 of 4

PRESSURE RELIEF DEVICE

Dimension Drawings


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 2 of 4


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 3 of 4


Telephone : + 84 - 4 - 8611010

Fax : + 84 - 4 - 8611009

Page 4 of 4

206 Series Medium Pressure Relief Device

Relief youcan count onProvenprotectionfor distributionand small powertransformers

Th

e

So

lu

ti

on

s

En

gi

ne

er

s

The 206 SeriesMedium PressureRelief Device

When transformer pressure rises beyondits predetermined limit, you need a pressurerelief device you can count on to protectyour valuable equipment. Designed toquickly relieve large volumes of gas orfluid inside distribution and small powertransformers, the Qualitrol 206 SeriesMedium Pressure Relief Device (PRD)delivers unprecedented reliability andperformance. Though it offers the standard125 mm bolt circle mounting typicallyfound on transformers with up to 3000liter tanks, the 50+ mm diameter openingis the largest available.

When internal tank pressure rises, thevalve within the PRD begins to lift offthe top seal. The exposed area of thevalve increases to the side seal, causinga proportionate and sudden increasein pressure. The valve then opens witha burst to rapidly release pressure. Oncepressure is relieved the valve returns quicklyto its sealed position.

The 206 also offers a better seal, bothinternally and between the device and thetransformer. Internally, the top and side

seals are molded as one part, combiningto create an extremely effective multisealgasket, which is securely fastened to theflange. This superior design eliminates thepotential of seal blowout and providesmore reliable resealing after pressure relief— you can rest assured that dirt andmoisture will not find their way into thetank. Externally, the mounting gasket’sflat, rectangular shape provides bettersealing on the potentially irregular exteriorsurfaces of transformers.

The 206 Series MediumPressure Relief Device offers:

The largest diameter opening

Superior reliability with a mechanically fastened multiseal gasket

Completely corrosion-resistant

Standard Nitrile or optional Vitonsealing gaskets

Optional diverter cover and alarm switch

100% tested for certified performance

Customized Relief

The Qualitrol 206 Medium PressureRelief Device offers several featuresand options:

The ability to adjust the operating pressure of the 206 allows you to customizeyour PRD to meet your needs. Operating pressure is adjustable in three ranges(2.9 to 5.7 PSI, 5.8 to 8.6 PSI and 8.7 to 11.6 PSI) based upon model ordered.Pressure is adjusted with a locknut and adjustment nut on the valve stem. A springpin fastened to the end of the valve stem prevents the locking hardware fromdropping into the tank.Choose between Nitrile or Viton gasket materials – for both the valve gasket and mounting gasket – depending upon your requirements.Up to two alarm switches and an operations indicator can be provided, mountedon a stainless steel plate. The alarm switches are made of durable thermoplastic.

For further protection of equipment and personnel, a stainless steel diverter cover redirects the flow of hot oil and gas should the PRD operate. Mounted to the top of the device, it redirects effluent away from personnel or critical parts on the transformer.The cover accommodates up to two alarm switches and an indicator.

A 50+ mm flow diameter Multiseal gasket securely locked

to the flangeCorrosion-resistant stainless steel and chromate coated aluminum materials

Standard bleed system for removalof gas on solid liquid filled systems

Adjustable operating pressure Optional plate, diverter cover

and alarm switch

206 Series MediumPressure Relief Device

Features and Options

The 206 Series Medium Pressure Relief Device

When the pressure rises, the unit will exhaust rapidly with a percussive “bang.”

The device positively reseals at approximately half its normal operating pressure.

Optional alarms or the indicator will trip as the mechanism actuates.

100% Tested for Reliability

Each and every Pressure Relief Deviceis tested prior to shipping to ensureproper operation.

The flange, ring and valve are made from aluminum with a chromateconversion coating.

The exposed aluminum components are additionally coated with two partepoxy paint.

The optional switch plate and diverter cover boast the strength and longevityof stainless steel.

Corrosion Resistance

The 206 is designed to survivethe toughest environments.

With optionaldiverter cover

Withalarmswitch

Dimensions

Optional Features

Cover/Plate Diameter: 162.9 mm (6.41 inches)

Flange Diameter: 156.6 mm (6.17 inches)

Mounting Diameter: 125 mm (4.92 inches) bolt circle mounting

External Height: 47.5 mm (1.87 inches)

Flow Diameter: 50.8 mm (2.00 inches)

Recommended 75 mm (2.95 inches)Tank Opening:

Materials

Flange: Aluminum with iron phosphate coating andASA 70 light gray thermosetting powder coat

IP 66, PG-13.5 cable entry,max. 2.5 mm2 stranded wire (14 AWG)

Alarm Switch:

Ambient Operating -40°C to +80°C (-40°F to +176°F)Temperature:Environmental

ResistanceOil Operating Temperature: -20°C to +100°C (-4°F to +212°F)

Ring: Aluminum with chromate conversion coating

Valve: Aluminum with chromate conversion coating and ASA 70 light gray epoxy paint - Sealing areas coated with silicone-based lubricant

Indicator: Brass

Bushing: Stainless steel

Spring: ASTM A229 oil tempered spring wire with zinc plate and chromate

Spring Seat: Aluminum

Valve Stem: Carbon steel with zinc plate and chromate

Gaskets: Nitrile (standard) or Viton (optional)

PRD External Hardware: Stainless steel

Plate/Cover: Stainless steel

Studs: Stainless steel

Alarm Switch: Thermoplastic enclosure

Cover/Plate Height: 98.9 mm (3.89 inches); 122.4 mm (4.82 inches) with switch

Operating -25°C to +85°C (-13°F to +185°F)Temperature:

Rated Impulse 2500 VDCWithstand:

Ratings: 6 A @ 120 VAC, 3 A @ 240 VAC0.55 A @ 125 VDC non-inductive,0.27 A @ 250 VDC non-inductive

206

Seri

es M

ediu

m P

ress

ure

Relie

f De

vice

Technical Specifications

© Qualitrol 2000 Qualitrol and Qualitrol AKM are ISO 9001 system certified companiesQSB 206, 8/00. Information subject to change without notice.

AB Qualitrol AKMFlygfältsgatan 6CSE - 128 30 SkarpnäckSweden

Phone: +46 8 447 54 50Fax: +46 8 604 68 10

E-mail: [email protected]

Qualitrol Corporation1385 Fairport RoadFairport, New York 14450USA

Phone: 716-586-1515Fax Orders: 716-377-0220Fax Quotes: 716-377-9613

E-mail: [email protected]

Notes: (unless specified otherwise)1. Dimensions are in mm [inches].2. Materials: flange/valve are aluminum,

conversion coated and gray epoxy painted;cover/plate are stainless steel.

Sealed Alarm Switch(optional)

4 equally spacedØ18.0 [Ø.71] mounting holeson Ø125 [Ø4.921] B.C.

CoverVents

Ø162.9 [Ø6.41]2nd Alarm Switch(optional)

PG - 13.5 Cable Entry

Cover (optional)

Bleed Screw

(optional)Indicator normallyflush (extends as

shown dashed afterdevice has operated)-pushdown to reset-

193.4 [7.62]

71.0 [2.79]

98.9 [3.89]

47.5 [1.87]

Mounting Gasket suppliedfor Ø 98.4 [Ø3.875] O.D.X Ø79.4 [Ø3.125] I.D.X 3.2 [.13] DP. Gasket Groove

Ø156.6 [Ø6.17]

Ø95.0 [Ø3.74]

Ø60.5 [Ø2.38]

Switch Wiring

Notes:1. 21 and 22 are closed, 13 and 14 are open

when alarm switch is mounted and armedas shown.

2. When device operates: 21 and 22 open,13 and 14 close.

3. When the indicator is reset: 21 and 22will close and 13 and 14 will open.

4. Rated impulse withstand: 2500 VDC.

21 13

22 14

2 0 6 - -

01

0129N

V

2345

0000

678

000

kPa (2.9 PSI) 1

kPa (4.3 PSI) 1

kPa (5.8 PSI) 2

kPa (7.2 PSI) 2

kPa (8.7 PSI) 3

kPa (10.1 PSI) 3

kPa (11.6 PSI) 3

1 - Adjustable 20-39 kPa (2.9 - 5.7 PSI)



SeriesOperatingPressure

GasketMaterial

SwitchOptionCover

Option(includes indicator

unless noted)

No indicator, no switch

Switch (qty 1)3 amp at 240 VAC

Switches (qty 2)3 amp at 240 VAC

Indicator, no switch

No Cover(standard)

Cover

Nitrile(standard)

Viton

How to Order


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 1 of 15

OIL AND WINDING TEMPERATURE INDICATOR SERIES 34 & 35

1. METHOD FOR MEASURING


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 2 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 3 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 4 of 15

2. MATCHING RESISTANCE


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 5 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 6 of 15

3. INSTRUCTION


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 7 of 15

4. ELECTRICAL CIRCUIT 4.1. ELECTRICAL CIRCUIT FOR OIL TEMPERATURE INDICATOR


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 8 of 15

4.2. ELECTRICAL CIRCUIT FOR WINDING TEMPERATURE INDICATOR


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 9 of 15

4.3 ELECTRICAL CIRCUIT – LAST VERSION OVERVIEW


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 10 of 15

5. MEASURING RANGES AND BULB TYPES


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 11 of 15

6. DIMENSION DRAWINGS AND CONTACT RATING 6.1. DIMENSION DRAWINGS


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 12 of 15

6.2. TECHNICAL DATA FOR SWITCHES


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 13 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 14 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 14 of 15


Telephone : + 84 - 4 - 8611010Fax : + 84 - 4 - 8611009

Page 15 of 15