KA 01-01-12-02 Catalogue Buchholz Relay
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Transcript of KA 01-01-12-02 Catalogue Buchholz Relay
Transformer Protection Relays(Buchholz Principle)
Elektromotoren und Gerätebau Barleben GmbH
2
Elektromotoren und Gerätebau Barleben GmbH
Table of contentsPage
Company history 3
1. Preface 4
2. Design features 5
3. Function 73.1. Gas accumulation 73.2. Insulating liquid loss 83.3. Insulatingliquidflow 8
4. Tests 9
5. Typelistofsingle-floatBuchholzrelays 105.1. Single-floatBuchholzrelayswiththreadedconnection 105.2. Single-floatBuchholzrelayswithflangedconnection 10
6. Switchingsystemdesignoptionsforsingle-floatBuchholzrelays 11
7. Typelistofdouble-floatBuchholzrelays 127.1. Double-floatBuchholzrelayswiththreadedconnection 127.2. Double-floatBuchholzrelayswithflangedconnection(round) 137.3. Double-floatBuchholzrelayswithflangedconnection(square) 157.4. Double-floatBuchholzrelayswithgeometricalflangedimensions according to Chinese norm 157.5. Double-floatBuchholzrelayswithgeometricalflangedimensions according to former French norm 167.6. Double-floatBuchholzrelayswithgeometricalflangedimensions accordingtoformerBritishstandard 17
8. Switchingsystemdesignoptionsfordouble-floatBuchholzrelays 18
9. Technical data 22
10. Specialdesigns 2310.1. Explanationstocodes23or24 2410.2. Explanationstocode32 25
11. Explanationstocode60-Buchholz relay NM series 2611.1. DesignfeaturesofBuchholzrelayNMseries 2611.2. ExtrafunctionofBuchholzrelayNMseries 2611.3. Analogue measuring unit - Analogue measurement of gas volume 27
12. Ordering data/Type code 2812.1. Single-floatBuchholzrelays 2812.2. Double-floatBuchholzrelays 28
13. AdditionaldevicesforBuchholzrelays 3013.1. GassamplingdeviceZG1.2. 3013.2. OtheradditionaldevicesforBuchholzrelays 33
14. Other protection devices 35
3
Company historySinceitsfoundationthecompanyhaspassedthroughaneventfulhistorywithregardtoownership,affiliationandchangeofnameassociatedwithsuchdevelopment.
1921 DevelopmentofBuchholzrelaybyMaxBuchholz
1943 BranchofSIEMENSMagdeburg
1948 VEBElektromotorenwerkBarleben;VEM (state-ownedfirm)
1951 VEBStarkstromanlagenbauMagdeburg (state-ownedfirm)
1951 StartofmanufactureofBuchholzrelaysinBarleben
1965 StartofmanufactureofmonitoringrelaysfortapchangersinBarleben
1970 VEBElektrotechnikundGerätebauMagdeburg;EGEM (state-ownedfirm)
1980 VEBKombinatElektromaschinenbauDresden VEBElektromotorenwerkBarleben;VEM;ELMO (state-ownedfirm)
1990 VEMAntriebstechnikAGDresden ElektromotorenwerkBarlebenGmbH;VEM;ELMO (publiclimitedcompany)
1993 ElektromotorenundGerätebauBarlebenGmbH;EMB (privatelyownedcompany)
2005 StartofmanufactureofBuchholzrelaysNMseries
2009 NewpremisesinBarleben
Figure1-EMBcompanybuilding
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Elektromotoren und Gerätebau Barleben GmbH
1. Preface
TheBuchholzrelaywasdevelopedin1921byMaxBuchholz,Oberrat(seniorcouncillor)atPreußi-scheElektrizitäts-AG(Prussianelectricitysupplycompany)inKassel.Sincethattimeithasbeenanimportantprotectionandmonitoringdeviceforinsulatingliquid-filledtransformerswithconservatorsandchokecoils.Italsoallowsseparatemonitoringofoil-filledbushingsorcableterminalboxes.Itis mounted in the cooling cycle of the appliance to be protected and responds to faults such as gas generation,lossofinsulatingliquidandexcessivelyhighflowratesofthelatter.
Fortransformerswithhermeticalclosurebymeansofamembrane(rubbersack)intheconservatorBuchholzrelayscanbeusedalsoasindicatingdevices(“aircellfailurerelay”)ofthismembrane.
TheBuchholzrelayissuitableforopen-airaswellasindoorinstallations.
Buchholzrelaysareavailableinanumberoftypeswhichcomplywithnormsandstandardsandmeet special customer requirements. The type of relay to be used depends on the nominal rating and construction features of the appliance to be protected. Our range of products permits optimum flexibility.
ElektromotorenundGerätebauGmbH(EMBGmbH)providesmorethan60yearsexperienceinproducingBuchholzrelaysandotherprotectiondevicesforliquid-cooledandliquid-insulatedappli-ances.Itranksamongthemostdistinguishedmanufacturersofthistypeofequipment.EMBBuch-holzrelayscomplywithDINEN50216-2andareknownfortheireasyoperation,highreliabilityandextremelylonglife.
Figure2-DINENISO9001/2008certificate
Ourstaffofhighlyqualifiedengineersandexperiencedskilledworkersdotheirbesttoguarantee top quality high-precision products. ThecasingsaremachinedonmodernCNC-controlled machine tools. All products are subjectedtofinalinspectionwhenallfunctionsarecheckedusingspecialtestequipment.
Profoundexperienceandexpertiseareasound basis for high product quality. Extensivereferencesfromreputedtransformermanufacturersaswellasotherusersareproofof the high qualitative level of the products.
ThecompanyiscertifiedtoDINENISO9001/2008.
5
2. Design features
Casing
Thecasingismadeofweather-resistantcastaluminiumalloyprovidedwithapaintcoat.Itissuppliedeitherwithscrewedorflangedconnection(1).Thedifferentcasingdesignsavailableareshowninsection5forsingle-floatBuchholzrelaysandsection7fordouble-floatBuchholzrelays,othersareavailableonrequest.
Tochecktheswitchingsystemforproperfunction,thecasingisprovidedwithsightglas-ses(2).Thesightglassesprovidedwithscalespermit reading of collected gas volume.
Therelayscanbeprovidedwithhingedlids(3)to protect the sightglasses.
Cover
The upper section of the cover accommodates theterminalbox(1).Thetestvalve(2)andthetestkeycoveredbyacapnut(3)aswellasaplatewithinstructionsforactuatingthetestkey(4)arearrangedinfrontofthecover.Theterminalbox(1)accommodatestheearthterminal(5)anduptoeightbushings(6)forthe terminals provided in the base of the cover. The number of these bushings determines the designoftheswitchingsystemsintermsoftype and quantity of the magnet contact tubes.
Theterminalbox(1)issealedbyanaluminiumcap(7)sothatitissafetotouchandprotectedagainst pollution. If the cap is opened the gra-phicsymbolandtheconnectiondiagram(8)areshown.Thecablecanbeinsertedthroughthecablegland(9).
Figure5-Coverwithcapremoved
2
1
Figure4-Casingwiththreadedconnection
1
3
Figure3-Casingwithflangedconnection
7
8
6
95
1
23
4
6
Elektromotoren und Gerätebau Barleben GmbH
Switchgearofasingle-floatBuchholzrelay:
- Float -Permanentmagnet(s)-Magnetcontacttube(s)- Damper
The damper is held in its normal position by a magnet.
Switchgearofadouble-floatBuchholzrelay:
-Upperfloat-Lowerfloat-Permanentmagnet(s)forupperfloat-Permanentmagnet(s)forlowerfloat-Magnetcontacttube(s)forupperswitchingsystem-Magnetcontacttube(s)forlowerswitchingsystem- Damper
The damper is held in its normal position by a magnet andactsonthelowerswitchingsystem.
Switchgear
Theswitchgearhasthefollowingmaincomponents:
-Switchingsystem- Frame-Mechanicaltestingunit.
Whereasthesingle-floatBuchholzrelayhasonlyoneswitchingsystem,thedouble-floatBuchholzrelayhasanupperandalowerswitchingsystem.Permanentmagnetandfloatarerigidlylinkedforminganintegratedwholethatismovablyfittedtotheframetogetherwiththemechanicaltes-tingunitandthemagnetcontacttube(s).
Figure6-Single-floatBuchholzrelay
Figure7-Double-floatBuchholzrelay
7
3. Function
TheBuchholzrelayisinstalledinthepipebetweenthetankofthedevicetobeprotected(trans-former,reactor)andtheconservator.Duringnormaloperationitisfilledcompletelywithinsulatingliquid.
Duetobuoyancythefloatofthesingle-floatrelayandbothfloatsofthedouble-floatrelayareattheir top position.
Theupperandlowerswitchingsystemsformafunctionalunitinthesingle-floatBuchholzrelaysothatintheeventofafaultthetransformerisimmediatelydisconnectedfromthepowersystem.
InthefollowingthefunctionofaBuchholzrelayisexplainedusingtheexampleofadouble-floatBuchholzrelay.Ifafaultoccursinsidethetransformer,theBuchholzrelayrespondsasfollows:
3.1. Gas accumulation
Fault: Free gas is available in the insulating liquid.
Response:Thegasintheliquidmovesupwards,accumulatesintheBuchholzrelayanddisplacesthe insulating liquid level.
Themovingfloatactuatesaswitchcontact(magnetcontacttube).Analarmsignalistripped.
Thelowerfloatisnotaffectedasfromacertaingasvolumethegasflowsthroughapipingtotheconservator.
Gas
Öl
Figure 8 - Gas accumulation
Oil
Gas
8
Elektromotoren und Gerätebau Barleben GmbH
3.3. Insulatingliquidflow
Fault:Aspontaneousincidentgeneratesapressurewavemovinginthedirectionoftheconservator.
Response:Theliquidflowreachesthedamperarrangedintheliquidflow.Iftheflowrateexceedstheoperatingvalueofthedamper,thelattermovesinflowdirection.
Duetothismovementaswitchcontactisactuatedsothatthetransformerisdisconnected.
Afterreleaseofthepressurewavethelowerswitchingsystemreturnstoitsstartingposition.
BuchholzrelaysmanufacturedbyEMBareequippedwithadamperheldbyapermanentmagnet.
Öl
Figure10-Insulatingliquidflow
3.2. Insulating liquid loss
Fault:Insulatingliquidlossduetoleakage.
Response:Astheliquidlevelfallsthetopfloatmovesdownwards.Analarmistripped.Iftheliquidlosscontinues,conservatorandpipingaswellastheBuchholzrelaywillbeemptied.
Astheliquidlevelfalls,thelowerfloatmovesdownwards.Themovingfloatactuatesaswitchcon-tact so that the transformer is disconnected.
Luft
Öl
Figure 9 - Insulating liquid loss
Oil
Oil
Air
9
4. Tests
EachBuchholzrelayisprovidedwithaworks-numberthatisspecifiedonthetestcertificateandthenameplate.ThetestscarriedoutontheBuchholzrelayarerecordedinthetestcertificate.
- Dielectric strength test -Leakagetest - Functional test -Flowtest.
Buchholzrelaysaredeliveredincardboardboxes.Foreachrelaydeliveredthefollowingdocumentsinthelanguageagreedareproviced:
- Operating instructions -Testcertificate.
Thenameplatecoversthefollowinginformation:
Figure12-FlowtestFigure11-Functionalandleakagetest
works-no.6 digits
switchingelementS = normally-openÖ = normally-closedW = changed-over
IP code
type code
date of manufacture(week/year)Type
10
Elektromotoren und Gerätebau Barleben GmbH
5. Typelistofsingle-floatBuchholzrelays
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2
01(AG 25)(CG 25)
ThreadedconnectionG1½“
25 - - - - 16 185 170 62 3,1 ≤1600KVA
Figure13-Dimensionaldrawing,type01
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2
02(AF 25/6)
(-)
Flange4-hole 25 100 75 60 12 12 185 195 62 3,6 ≤1600KVA
03(AF 25/10)
(-)
Flange4-hole 25 115 85 68 14 16 200 205 62 4,0 ≤1600KVA
25(AF 25)
(-)
Flange4-hole 25 100 75 - 12 10 160 195 62 3,3 ≤1600KVA
5.2. Single-floatBuchholzrelayswithflangedconnection
Figure14-Dimensionaldrawing,type02,03,25
5.1. Single-floatBuchholzrelayswiththreadedconnection
250
300350
cm3
80
d1
d4
d3
d2
h2
h1
fl
170
R80d5
250
300350
cm3
80h2
170
d1
G11/2"
h1
l
R80
f
11
...1 ...2 ...3 ...4 ...5 ...6
1NO 1NC 2NO 2NC 1NOand1NC 1 CO
13
14
11
12
13
14 24
23 11
12 22
21 13
14 12
11
4
1
2
...7 ...8 ...92 CO 1NOand1CO 1NCand1CO
24
21
22 12
11
14 14
11
1224
23
14
11
1222
21
6. Switchingsystemdesignoptionsforsingle-floatBuchholzrelays
Magnetcontacttubesareusedasswitchingelements.Thesearenormally-open(NO),normally-closed(NC)andchange-over(CO)contacts.Themagnetcontacttubedesigncanbederivedfromthelastdigitofthetypecode.Forcoding,seeOrderingdata/TypecodeunderSection 12.1. on page 28.
Explanation of symbols: Example:coding„... 6“Magnetcontacttube(s)design
4
1
2 1 CO
Graphicsymbolwithterminalmarking
Connectiondiagraminterminalbox
The inner side of the cap accommodates a plate with the graphic symbol and the connection diagram. The schemes show the switching systems in their neutral position. The neutral positionistheoperatingconditionwhentheBuchholzrelayisfilledwithinsulatingliquidupthe required level and the device to be protected operates without any fault.
12
Elektromotoren und Gerätebau Barleben GmbH
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2 h3
04(BG 25)(DG 25)
ThreadedconnectionG1½“
25 - - - - 16 185 235 90 - 4,2 ≤5000KVA
21(BG 25 S)
(-)
ThreadedconnectionG1½“
25 - - - - 16 185 235 90 - 3,6 ≤5000KVA
7.1. Double-floatBuchholzrelayswiththreadedconnection
Figure15-Dimensionaldrawing,type04
Figure16-Dimensionaldrawing,type21
7. Typelistofdouble-floatBuchholzrelays
250
300350
cm3
80h2
h1
l
f
R143
170
d1
G11/2"
250
300350
cm3
80h2
h1
l
f
150
d1
G11/2"
13
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2
05(BF 25/6)
(-)
Flange4-hole 25 100 75 60 12 12 185 235 90 4,4 ≤5000KVA
06(BF 25/10)
(DR 25)
Flange4-hole 25 115 85 68 14 18 200 235 90 4,8 ≤5000KVA
23(BF 25/10 S)
(-)
Flange4-hole 25 115 85 68 14 18 200 235 90 4,4 ≤5000KVA
07(BF 50/6)
(-)
Flange4-hole 50 140 110 90 14 12 185 235 80 4,6 ≥5000KVA
≤10000KVA
08(BF 50/10)
(DR 50)
Flange4-hole 50 165 125 102 18 16 195 250 80 5,9 ≥5000KVA
≤10000KVA
09(BF 80/10)
(-)
Flange4-hole 80 200 160 138 18 15 195 265 80 6,2 ≥10000KVA
09-26.(BF80/10/8)
(DR 80)
Flange8-hole 80 200 160 138 18
M16 15 195 265 80 6,2 ≥10000KVA
24(BF 80/6)
(-)
Flange4-hole 80 190 150 130 18 15 195 260 80 6,0 ≥10000KVA
7.2. Double-floatBuchholzrelayswithflangedconnection(round)
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Elektromotoren und Gerätebau Barleben GmbH
Figure17-Dimensionaldrawing,type05,06,07,08,09,24
Figure18-Dimensionaldrawing,type23
Figure19-Dimensionaldrawing,type09-26.
250
300350
cm3
80
lf
h2
h1 R143
d5
170
M16
d1
d4
d3
d2
250
300350
cm3
80h2
fl
h1
d1d4d3d2
d5
150
250
300350
cm3
80
d1
d3
h2
fl
h1
170
143
d4
d2
d5
15
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 b d3 d4 d5 f l h1 h2
10(BF 80/Q)(DQ 80)
Flangesquare4-hole
80 125 132 - 18 20 200 235 80 5,0 ≥10000KVA
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 b d3 d4 d5 f l h1 h2
63(BC 80)(QJ 80)
Flangesquare4-hole
80 160 160 - 18 15 185 245 80 5,0 ≥10000KVA
Figure20-Dimensionaldrawing,type10
Figure21-Dimensionaldrawing,type63
7.3. Double-floatBuchholzrelayswithflangedconnection(square)
7.4. Double-floatBuchholzrelayswithgeometricalflangedimensions according to Chinese norm
SuitableforconnectiontoChinesebutterflyvalves(squareflange).Othertypesonrequest.
250
300350
cm3
80h2h1
l
f
R143
d3
d5
b
d1
b
170
250
300350
cm3
fl
80h2
h1
R143
b
b
d1
d5
170
d3
16
Elektromotoren und Gerätebau Barleben GmbH
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2
41(NF 25)
(-)
Flange4-hole 25 115 85 - 14 8 240 235 90 4,2 ≤5000KVA
42(NF 50)
(-)
Flange4-hole 50 165 125 - 18 11 240 250 80 5,1 ≥5000KVA
≤10000KVA
43(NF 80)
(-)
Flange4-hole 80 200 160 - 18 11 240 265 80 5,5 ≥10000KVA
7.5. Double-floatBuchholzrelayswithgeometricalflangedimensions according to former French norm
Figure22-Dimensionaldrawing,type41,42,43
250
300350
cm3
d5
90°
l
80h2
h1
d1
d3
150
b
b
17
TypeInternal descriptionDINdescription
Type of connection
Pipe diameterDN(mm)
Flange dimensions(mm)
Device dimensions(mm) Weight
(kg)
Suited fortransformerratings of
d1 d2 d3 d4 d5 f l h1 h2
51(BS 25)
(-)
Flangesquare4-hole
25 --
722,83
--
M10M10
--
1275
2359,25
903,54 3,7 ≤5000KVA
52(BS 50)
(-)
Flange6-hole 50 140
5,511104,33
--
120,47
120,47
1857,28
2359,25
803,15 4,8 ≥5000KVA
≤10000KVA
53(BS 80)
(-)
Flange6-hole 80 160
6,301305,12
--
120,47
130,51
1857,28
2409,45
803,15 5,0 ≥10000KVA
Figure23-Dimensionaldrawing,type51
Figure24-Dimensionaldrawing,type52,53
7.6. Double-floatBuchholzrelayswithgeometricalflangedimensions according to former British standard
250
300350
cm3
170
d1
d3
d5
h1
f
l
d2
R143
80h2
250
300350
cm3
d5
90°
l
80h2
d1
d3
150
b
b
h1
18
Elektromotoren und Gerätebau Barleben GmbH
8. Switchingsystemdesignoptionsfordouble-floatBuchholzrelays
Magnetcontacttubesareusedasswitchingelements.Thesearenormally-open(NO),normally-closed(NC)andchange-over(CO)contacts.Themagnetcontacttubedesigncanbederivedfromthelasttwodigitsofthetypecode.Forcoding,seeOrderingdata/TypecodeunderSection 12.2. on page 2.
...11 BS 25...11 ...12 ...13 ...14 ...15Alarm Alarm Alarm Alarm Alarm Alarm1NO 1NO 1NO 1NO 1NO 1NO
13
14
13
14
13
14
13
14
13
14
13
14
Disconnection Disconnection Disconnection Disconnection Disconnection Disconnection
1NO 1NO 1NC 2NO 2NC 1NOand1NC
23
24
23
24
11
12
23
24 34
33 11
12 22
21 23
24 12
11
...16 ...17 ...19 ...21Alarm Alarm Alarm Alarm1NO 1NO 1NO 1NC
23
24
13
14
13
14
11
12
Disconnection Disconnection Disconnection Disconnection
1 CO 2 CO 3NO 1NO
14
11
1224
21
22 32
31
34
23
24 34
33
44
4313
14
19
...22 ...23 ...24 ...25 ...26 ...27Alarm Alarm Alarm Alarm Alarm Alarm1NC 1NC 1NC 1NC 1NC 1NC
11
12
11
12
11
12
11
12
21
22
11
12
Disconnection Disconnection Disconnection Disconnection Disconnection Disconnection
1NC 2NO 2NC 1NOand1NC 1 CO 2 CO
21
22
13
14 24
23 21
22 32
31 13
14 22
21
14
11
12 24
21
22 32
31
34
...31 ...32 ...33 ...34 ...35 ...36Alarm Alarm Alarm Alarm Alarm Alarm1 CO 1 CO 1 CO 1 CO 1 CO 1 CO
24
21
22 24
21
22 24
21
22 24
21
22 24
21
22 24
21
22
Disconnection Disconnection Disconnection Disconnection Disconnection Disconnection
1NO 1NC 2NO 2NC 1NOand1NC 1 CO
13
14
11
12
33
34 44
43 31
32 42
41 13
14 12
11
14
11
12
20
Elektromotoren und Gerätebau Barleben GmbH
...41 ...42 ...43 ...44 ...45 ...46Alarm Alarm Alarm Alarm Alarm Alarm2NO 2NO 2NO 2NO 2NO 2NO
13
14 24
23 13
14 24
23 13
14 24
23 13
14 24
23 13
14 24
23 23
24 34
33
Disconnection Disconnection Disconnection Disconnection Disconnection Disconnection
1NO 1NC 2NO 2NC 1NOand1NC 1 CO
33
34
11
12
33
34 44
43 11
12 22
21 33
34 12
11
14
11
12
14 34 3313
...51 ...52 ...53 ...54 ...55 ...56Alarm Alarm Alarm Alarm Alarm Alarm
1NCand1NO
1NCand1NO
1NCand1NO
1NCand1NO
1NCand1NO
1NCand1NO
11
12 14
13 11
12 14
13 11
12 14
13 11
12 14
13 11
12 14
13 21
22 24
23
Disconnection Disconnection Disconnection Disconnection Disconnection Disconnection
1NO 1NC 2NO 2NC 1NCand1NO 1 CO
23
24
21
22
23
24 34
33 21
22 32
31 21
22 24
23
14
11
12
21
The inner side of the cap accommodates a plate with the graphic symbol and the connection diagram. The schemes show the switching systems in their neutral position. The neutral positionistheoperatingconditionwhentheBuchholzrelayisfilledwithinsulatingliquidupthe required level and the device to be protected operates without any fault.
Explanation of symbols: Example:coding„...1 2“Magnetcontacttube(s)designUpperswitchingsystem-AlarmLowerswitchingsystem-Disconnection
13
14
11
12
Alarm1NO
Disconnection1NC
Graphicsymbolwithterminalmarking
Connectiondiagraminterminalbox
22
Elektromotoren und Gerätebau Barleben GmbH
9. Technical data
Parameter Data NotesVoltage AC12V-max.250V
DC12V-max.250VCurrent AC0.01A-max.2A
DC0.01A-max.2Acosφ>0,5L/R<40ms
Switchingcapacity ACmax.400VADCmax.250W
Dielectric strength AC2500VAC2000V(normally-opencontact)AC1000V(change-overcontact)
betweenelectriccircuitandearthbetweenopencontacts
Temperaturerange:- Ambient temperature
- Operating range * Temperature of the insulating liquid
* Viscosity of the insulating liquid
-40°Cto+55°C-40°Fto+131°F
-40°Cto+115°C-40°Fto+239°F
1 mm2/sto1100mm2/s
Climatic testing acc. toDINEN60068-2-78:2002-09
Othersonrequest:extremefrigidopen-airconditionsbelow-40°Coroffshore
Resistanceagainstvibration Class4M6 Classificationacc.toDINEN60721-3-4
Resistancetopressure 0.25MPaResistancetovacuum <2.5kPaInsensitivitytomagneticfields 25 mT Staticmagneticfieldofany
direction and polaritySwitchingsystem:-Numberofswitchingcontacts-Switchingelement- Damper
Responsetimeofdamper
1MagnetcontacttubeHeldbymagnets
<0.1s
Moreonrequest
Responseofswitchingsystemincaseof:- Gas accumulation
-InsulatingliquidflowPipediameterDNof25mm,50mmor80mm
200cm3to300cm3
min.0.65tomax.3.00m/s+/-15%
For possible data see Ordering data/Type code under Section 12 on pages 28 and 29.
Cable gland M20x1.5;M25x1.5 Others on requestNominalinstallationposition 0°to5° AscendingtowardsconservatorIP code IP54;IP56;IP66 Others on request
Casing colour Two-componenttexturepaint On polyurethane basis
ThetechnicaldatalistedinTable1areapplicabletoallBuchholzrelaysmanufacturedbyEMB.EMBBuchholzrelaysareincompliancewithDINEN50216-2.OptionsavailablearespecifiedintablesofSection10onpage23.ThesespecialdesignsarecodedusingtherespectivecodewhenorderingBuchholzrelays.
23
10. Special designs
Climate-proofversion(extremefrigidopen-airconditionsbelow-40°C) 34Climate-proofversion(offshore) 36
Climate-proof version
Explanation CodeNMseries-Buchholzrelaywithanaloguemeasurementofthegasvolume(onlydouble-floatBuchholzrelays) 60
Buchholz relay NM series
Withoildrainplug(onlydouble-floatBuchholzrelays) 28WithpremountedHarting-Connector(Theoptionisindicatedbyaletterafterthecode.) 59
Casing
Upperswitchingsystemequippedwithtwomagnetcontacttubes 35Lowerswitchingsystemequippedwithtwomagnetcontacttubes 25Upperandlowerswitchingsystemeachequippedwithtwomagnetcontacttubes 33 Lowerswitchingsystemequippedwiththreemagnetcontacttubes 99Testingoftheswitchingsystemsbymeansofcompressed-airandtestkey(onlydouble-floatBuchholzrelays) 32 Damperheldinresponseposition(onlydouble-floatBuchholzrelays) 23SpecialdesignapprovedbyRWE,Germany(onlydouble-floatBuchholzrelays) 24
Switching system (fordesignoptionsseepage11orpages18-20)
Specialrequest(onspecialagreementwithcustomer) 29
Special request
CasingcolourRAL7001(silver-grey) 41 CasingcolourRAL7012(basalt-grey) 42 CasingcolourRAL7022(umber-grey) 43 CasingcolourRAL7033(cement-grey) 44 CasingcolourRAL7038(agate-grey) 45 CasingcolourRAL7035(light-grey) 46CasingcolourRAL7016(anthracite-grey) 47CasingcolourRAL9002(grey-white) 48CasingcolourRAL7032(siliceous-grey) 49
Casing colour
Insulating liquid silicone oil 20Insulating liquid based on esther 21
Insulating liquid
IP code IP 56 38IP code IP 66 39
IP code
24
Elektromotoren und Gerätebau Barleben GmbH
10.1. Explanations to codes 23 or 24 Buchholzrelayswiththefeature„damperheldinresponseposition“aredesignedsuchthatthedamperafteritwasoperatedduetoanunacceptablehighflowrateoftheinsulatingliquidislockedinitspositionand,henceiskeptinthispositionevenaftertheflowratehasbeenreduced.This means that the signal generated is maintained.
Thedamperhastobeunlockedmanuallybyturningthetestkeyanticlockwise.Whenunlockingthedamper,alsochecktheinsulatingliquidlevelintheBuchholzrelay.BleedtheBuchholzrelay,if required.
Forengineeringreasonsthefollowingspecialdesignscannotbecombinedinthesamedevice:
Code combination Code combination Code combination60-32 32-23,24 33-23,2460-33 32 - 25 33 - 9960-34 32 - 3360-35 32 - 35 35-23,2460-36 32 - 99 35 - 9960-5960-99 99-23,24
25
10.2. Explanations to code 32
ForBuchholzrelaysprovidedadditionallywithanairnipple(code32),themechanicalfunctionofthetwoswitchingsystemscanbetestedbymeansoftestkey(1),andtheupperswitchingsystem(alarm)canbetestedbypumpinginairviathetestvalve(2)usingasuitabletestpump.Additi-onally,theswitchingsystemscanbetestedpneumatically.Tothisend,airissuppliedviaanairsupplynipple(3)providedwithacheckvalve.PerformthetestwhiletheBuchholzrelayisfilledwithinsulating liquid up to the required level.
Pneumatic test of the upper switching system (alarm) using compressed air:Air is introduced slowlyintotheBuchholzrelaythroughtheairsupplynippleandthepipeairuntilthealarmcontactismadewhentheupperfloatislowered.
Pneumatic test of the lower switching system (disconnection) using compressed air:Through the air supply nipple and the pipe air is applied suddenly to the damper. When the damper responds the disconnection contact is made. Afteranytestusingair,bleedtheBuchholzrelaythroughthetestvalve.
ThefunctionaltestusingcompressedairresultsfromBritishStandardB.E.B.S.T2of1966.
Figure25-Coverwithadditionalairsupplynipple
2 3 1
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Elektromotoren und Gerätebau Barleben GmbH
11.2. Extra function of Buchholz relay NM series
ThestandardBuchholzrelaydetectsundissolvedgasesintheinsulatingliquidandindicatestheirpresencewhenaspecifiedthresholdisexceeded,meaningthatuptoacertaingasvolume,nosignalisgenerated.Neitherisitpossibletogatherinformationaboutthelengthoftimeittakesforgas to accumulate.
The process of the generation of unsolved gases in the insulating liquid over time is a very im-portant criterion for the evaluation of the fault as the quantity and composition of the fault gases dependonthekindandquantityoftheenergyoftheunderlyingfault.Spontaneousandenergy-richfaultscauselargegasquantitieswithinashortperiodoftime,whilstsmallvolumesofgasaregenerated in the case of minor and insidious faults.
TheBuchholzrelayofNMseriesallowscontinuousandanaloguegasvolumemeasurementsothatgaseswhichhaveaccumulatedintherelayaredetectedatanearlystage,informationaboutthe generation of the gases obtained and the conditions provided for the analysis of the fault at an early stage.
11. Explanations to code 60 - Buchholz relay NM series
11.1. Design features of Buchholz relay NM series
TheprincipalconstructionoftheBuchholzrelaywithfloatsanddamperaswellastheirelectro-mechanical functions have been maintained.
TheBuchholzrelayofseriesNMisequippedadditionallywithacapacitivesensor.ThesensorisinstalledinthecoveroftheBuchholzrelay.Thecapoftheterminalboxaccommodatestheelec-tronicamplifierofthemeasuringunit.Sensorandamplifierareconnectedbyashieldedcableinthree-wiretechnologyof15mlengthwithacableconnector.Thiscableisusedforthesupplyvoltage and the output signal.
Figure26showsthearrangementofthemeasuringunitusingtheexampleofaBuchholzrelayBF80/10/8.Apartfromthedusthoodandthecapoftheterminalboxwhicharehigherbyapprox.30mm,theinstallationdimensionsoftherelayhavenotbeenchanged.Hence,relayswithanaloguemeasuringunitscanbeinstalledinexistingsystems.
Figure26-DimensionaldrawingBuchholzrelayNMseriestype09-26.(BF80/10/8)
109
80
291
19515
138
200
170
M16
18
80
160
R143
27
11.3. Analogue measuring unit - Analogue measurement of gas volume
The measured value is based on capacitance variation of the sensor caused by variation of the insulatingliquidlevelintheBuchholzrelay.
Analoguemeasurementofthegasvolumeispossiblebetween50cm3and300cm3.Lowergasvolumescannotbemeasuredreliablybecauseofhighinaccuracies.Measurementsbeyondthisrangearenotnecessaryasinthiscasetheupperswitchingsystemwillrespond.Besides,theconstructionoftheBuchholzrelay(largergasvolumesescapetowardstheconservator)doesnotallowsuchmeasurements.Theoperatingpointoftheupperswitchingsystem(upperfloat)isagasvolumeof200-300cm3.
Fault: Free gas is available in the insulating liquid.
Response:Thegasintheliquidmovesupwards,accumulatesintheBuchholzrelayanddisplacestheinsulatingliquid.Thisdecreasesthelevelofinsulatingliquid.Liquidlevelchangesleadtovaria-tion of the capacity of the sensor. This change is converted into an analogue current signal.
It should be noted that for design reasons the current value of the sensor remains relatively con-stantuptoagasvolumeofapprox.50cm3.Thefunctionequationwillprovidetheactualvolumeonlywhenthecurrentsignalbecomessmallerand,hencethecalculatedvolumenoticeablylarger.
TheextrafunctionoftheNMseriesrelaysisensuredbyacapacitivesensorandtheappropriateelectronic components. Supply voltage of this assembly is DC 24 V. This voltage must be made available by the user. The output signal of the measuring unit is a standard current signal of DC4to20mA.Itdependsontheuserhowandinwhatformthissignalisprocessed.
ExtrafunctionoftheBuchholz relayNMseries
Standard functionoftheBuchholzrelay
Monitoring-system
Conversion and processing
Disconnection Alarm
DC 24 V
DC4-20mA
DC12V-max.250VDC0,01A-max.2A
Figure27-ExtrafunctionofBuchholzrelayNMseries
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Elektromotoren und Gerätebau Barleben GmbH
12. Ordering data/Type code
Forplacingorders,please,usethefollowingkey:
For switching system design options for single-floatBuchholzrelays,seeSection6onpage11.
12.1. Single-floatBuchholzrelays
Type(seeSection5)
Special design(seeSection10)
0=notoccupied
Dampersetting(m/s)
01=0,65+/-15%02=1,00+/-15%03=1,50+/-15%
Contact setting ofswitchingsystem
1=oneNOcontact2=oneNCcontact3=twoNOcontacts4=twoNCcontacts5=oneNOandoneNCcontact 6 = one CO contact7=twoCOcontacts8=oneNOandoneCOcontact9=oneNCandoneCOcontact
XX XX. XX. X X0
Orderingexamplefordouble-floatBuchholzrelays:
YouneedaBuchholzrelayoftypeBF80/Q.Thedampershouldrespondataflowrateof1.50m/s.Theupperswitchingsystemshouldbeequippedwithoneswitchingelement(magnetcontacttube)andthelowerwithtwoswitchingelements(magnetcontacttubes).Theupperswitchingelementshouldbedesignedasonenormallyopencontact,andthelowerastwonormallyopencontacts.ThedeviceshouldbedeliveredincolourRAL7033andshouldhaveoneoildrainplug.
Basedonthedataonpage29therelayorderedhasthefollowing
Typecode: 10-25.28.44.-0313
Explanation: 10=Double-floatBuchholzrelaytype10(BF80/Q) 25=Lowerswitchingsystemequippedwith2magnetcontacttubes 28 = With oil drain plug 44=CasingcolourRAL7033(cement-grey) 03=Dampersetting:1.50m/s+/-15% 1=Contactsettingofupperswitchingsystem:1NO 3=Contactsettingoflowerswitchingsystem:2NO
Legend:NO=normally-opencontactNC=normally-closedcontact CO = change-over contact
12.2. Double-floatBuchholzrelays
29
Double-floatBuchholzrelays
Forswitchingsystemdesignoptionsfordouble-floatBuchholzrelays,seeSection8onpages18-20.
Type(seeSection7)
Special design(seeSection10)
Dampersetting(m/s)
01=0,65+/-15% 11=1,20+/-15%02=1,00+/-15% 12=1,25+/-15%03=1,50+/-15% 13=1,30+/-15%04=2,00+/-15% 14=1,40+/-15%05=2,50+/-15% 15=1,80+/-15%06=3,00+/-15%
Contact setting of lowerswitchingsystem(disconnection)
1=oneNOcontact2=oneNCcontact3=twoNOcontacts4=twoNCcontacts5=oneNOandoneNCcontact 6 = one CO contact7=twoCOcontacts
9=threeNOcontacts
Contact setting of upperswitchingsystem(alarm)
1=oneNOcontact2=oneNCcontact 3 = one CO contact4=twoNOcontacts5=oneNCandoneNOcontact
XX XX. XX. XX XX
Legend:NO=normally-opencontactNC=normally-closedcontact CO = change-over contact
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Elektromotoren und Gerätebau Barleben GmbH
13. Additional devices for Buchholz relays
13.1. Gas sampling device ZG 1.2.
ThegassamplingdeviceismountedonthetransformerandconnectedtotheBuchholzrelaybymeansofapipe.Itallowssamplingoftherelaygasatnormaloperatinglevel.
Thelengthofthepipecanbeselectedbythecustomer(please,seepage31).
Thedevicecanbedeliveredwithalockablebox.
Figure 28 - Gas sampling device ZG 1.2. Figure 29 - Gas sampling device ZG 1.2. inlockablebox
Figure30-PipeofgassamplingdeviceZG1.2. Figure 31 - Sightglass cover for gas sampling device ZG 1.2.
31
Parameter Data NotesGas outlet opening G1/8“ Others on requestOil outlet opening G1/8“ Others on requestTemperaturerange:- Ambient temperature
- Operating range * Temperature of the insulating liquid
* Viscosity of the insulating liquid
-40°Cto+55°C-40°Fto+131°F
-40°Cto+115°C-40°Fto+239°F
1 mm2/sto1100mm2/s
Othersonrequest:extremefrigidopen-airconditionsbelow-40°Coroffshore
Weightwithoutpiping 2,2kgDimensions of pipe Ø6x1copperLengthofpipe <20m As requested by customerCasing colour Two-componenttexturepaint On polyurethane basis
Technical data
Insulating liquid silicone oil 20Insulating liquid based on esther 21
Insulating liquid
Climate-proofversion(extremefrigidopen-airconditionsbelow-40°C) 34Climate-proofversion(offshore) 36
Climate-proof version
Explanation CodeCasingcolourRAL7001(silver-grey) 41 CasingcolourRAL7012(basalt-grey) 42 CasingcolourRAL7022(umber-grey) 43 CasingcolourRAL7033(cement-grey) 44 CasingcolourRAL7038(agate-grey) 45 CasingcolourRAL7035(light-grey) 46CasingcolourRAL7016(anthracite-grey) 47CasingcolourRAL9002(grey-white) 48CasingcolourRAL7032(siliceous-grey) 49
Colour
Specialrequest(onspecialagreementwithcustomer) 29
Special request
Special designs:
32
Elektromotoren und Gerätebau Barleben GmbH
Figure32-Dimensionaldrawing,typeZG1.2.
90 XX. XX. X XX,XXm
Type for ZG 1.2.
Lengthofpipein meters
Special designs(seepage31)
0=withoutbox1=withbox
Ordering example of gas sampling device ZG 1.2.:
Typecode: 90-34.44.-0-10,50mExplanation: 90=GassamplingdeviceZG1.2. 34=Climate-proofversion(extremefrigidopen-airconditionsbelow-40°C) 44=CasingcolourRAL7033(cement-grey) 0=Withoutbox 10,50m=Lengthofpipe10,50m
Ordering data/Type code of gas sampling device ZG 1.2.
125
9
15
93
210
30
10
33
Gas testing device ZG 3.1.
ThegastestingdeviceisusedtotestthegasaccumulatedintheBuchholzrelay.ItcanbeinstalledeitherdirectlyonthetestvalveoftheBuchholzrelayoronthegasoutlettapofthegassamplingdevice.TheBuchholzgasflowsthroughtwodifferentchemicalsolutionsanditscolourreactionsindicatethenature of the fault.
Use of the gas testing device is no substitute for a gas chromatographic analysis.
RefluxlockZG4.1.
Thedevicepreventsinsulatingliquidfromflowingintothegastestingdevice.ThedeviceisinstalledbetweentheBuchholzrelayorgassamplingdeviceand the gas testing device.
Test pump ZG 5.1. and ZG 5.2.
Thetestpumpchecksthefunctioningoftheupperswitchingsystem(alarm)oftheBuchholzrelaybypumpinginair.Thetestcanbeperformeddirect-lyontheBuchholzrelay.Forthatpurpose,thetestpumpisconnectedtothetestvalveoftheBuchholzrelay.Whenthetestisperformedviathegassamplingdevice,thetestpumpisconnectedtothegasoutlettapofthegassampling device.
- ZG 5.1. manually operated- ZG 5.2. pedal-operated
Oil sampling device ZG 6.1.
TheoilsamplingdeviceisconnectedtotheBuchholzrelayviaapipeandisusedtotakeoilsamplesfromtheBuchholzrelay(suitableforusewithBuchholzrelayswithanoildrainplug).Thepipeissuppliedtothecustomer’sspecifications.
13.2. Other additional devices for Buchholz relays
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Elektromotoren und Gerätebau Barleben GmbH
Buchholz gas sampler BGS
TheBuchholzgassamplerprovidesasafemethodoftakingandtransportinggassamplesfromtheBuchholzrelayorthegassamplingdevice.Itscapacityis100ml.
Buchholz gas tester BGT
TheBuchholzgastesterisusedtomeasurethehydrogenconcentrationoftheBuchholzgases.Themeasurementcanbeperformeddirectlywherethesampleistaken.
Forothergastestingequipment,please,contactus.
35
MonitoringrelayfortapchangersÜRF25,ÜRF25/10,ÜRF25/10-26
Themonitoringrelayfortapchangers,alsoknownastheprotectionrelayfortapchangersoroilflowrelay,isamonitoringdeviceforinsulatingliquid-filledtapchangerswithconservator.Itprotectsthetapchangerandthetransfor-merfromdamage.Themonitoringrelayrespondstoexcessiveoilflowinthedirection of the conservator and generates a signal disconnecting the tap changer and the transformer immediately from voltage supply.
PipediameterDN:25mm(1“)Typeofconnection:threadedorflanged
Oilflowindicator SG25,SF25,SF25/10
Theoilflowindicatorisaprotectiverelaymonitoringthecirculatingoillubri-cation or circulating oil cooling of machines and equipment. It indicates faults incirculatingoilsystemsorshutsdownthemachineorequipment,thuspre-ventingdamage.Theflowindicatoroperatesataverylowservicepressure,soitcanbeinstalledinanoilreturnpipewheretheoilflowisensuredbythesloping pipe.
PipediameterDN:25mm(1“)Typeofconnection:threadedorflanged
14. Other protection devices
Forfurtherinformation,pleaseaskforspecialreferencematerial.
Duetotechnicalimprovementofourproducts,theinformationcontainedinthiscatalogueissubjecttochangewithoutnotice.Wewouldliketoapologizeforanyprintingerrorswhichhavenotbeenfounddespiteofintensiveproof-reading.
Edition:CatalogueBuchholzrelaysKA01/01/12/02English
EMBGmbHOtto-von-Guericke-Allee12D-39179Barleben|Germany
Phone: +4939203790Fax: +49392035330
Email: [email protected]: www.emb-online.de www.buchholzrelay.com
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