PB Weir Substation Earth End Clamps - CE22-BESI-L2 & CE20-ESI-E1

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P & B W E I R E A R T H I N G E Q U I P M E N T C A T A L O G U E 2 0 0 0 1

Section 1

Portable Earthing Equipment for Sub-Stations

This portable earthing equipment is specifically for maintenance onoutdoor high voltage substations. It has been designed to provide safe and sure clamping where certainconnections are to be made on dirty or heavily oxidisedcopper/aluminium bars or stubs and in other cases to meet therequirements for the modern 132,275 and 400 kV substations havingtubular aluminium connection diameters 90mm,102mm, 140mm,160mm and 200mm.In their respective applications the clamps, operating poles, sockets andcables have safely withstood their respective Mechanical Type Testsand/or Short Time Current Type Tests specified in ESI 41-21 Section 5.

Terry Mcdonald

Leak Detection

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P & B W E I R E A R T H I N G E Q U I P M E N T C A T A L O G U E 2 0 0 02

1. ScopeThe complete range, capabilities anddetails of this equipment will beidentified and illustrated in Figs 1 to 17inclusive

2. Design & ConstructionAll the equipment illustrated is designedto meet the specific requirements of ESI41-21. The construction is of a robustnature and will withstand a reasonableamount of rough handling.

3. Equipment3.1 – Earth End ClampsThe spring loaded feature of all typesmakes them suitable for application byhand to copper or aluminium earth barsin any natural condition. (See paragraph5.1)3.2 - Line End ClampsAll types whether spring loaded or notshould be applied by means of anoperating socket (See paragraph 5.2)attached to an insulated operating pole.The design of all Line End Clamps issuch that once hooked over a busbarthey become self supporting whilst theoperating screw is tightened orloosened.3.3 – Stranded Conductors – LineEnd ClampIt may be necessary in some oldersubstations to apply earths to dirtystranded conductors. However, smalldiameter stranded conductors may notcarry the full rated current, but tests haveshown that Clamp Type ESI-L1successfully carried 13.1 kA (750 MVA at33 kV) for 2 seconds when attached to a200 sq. mm in polluted hard-drawncopper stranded conductor.3.4- Operating SocketsMade in light alloy material, the twotypes are illustrated in Figs 15 and 16.These essentially support the Line EndClamp when being carried at the end ofan operating pole and also actuate theoperating screw of the Line End clampwhen being secured in position or beingremoved.Socket type S9D ESI S1 (Fig. 15)supports clamps being applied in anupward direction.Socket type CEA/S ESI S2 (Fig. 16) is analternative type to the above where theoperating screw of the Line End Clamp iscontrolled by means of spring loadingenclosed in the socket.3.5– Operating Poles – InsulatedThese should be limited to a length of4.88m (16ft) as it is considered that this

is the maximum length of pole withclamp and lead attached which cannormally be handled with safety. Poles ofthese lengths are made up in multiplesections of 1.22m (4ft) lengths (SeeFig.17) the joints are machined toprovide a rigid assembly and include adouble sided snap action spring lockingdevice. All details are in accordance withSpecification ESI 41-21.3.6 – Earth LeadsOnly cables from approvedmanufacturers and terminations withapproved compression end and supportsprings in accordance with SpecificationESI 41-21 Paragraph 6.1, are suppliedfor earthing leads for connectingbetween the Line End Clamps and theEarth End Clamps.The flexible conductor is of circularcross-section made up of commerciallypure aluminium wires in the H68(BS2627) condition giving a nominalsectional area of 150mm2. The nominalnumber and nominal diameter of wires is925/0.45mm. The conductor is laid upas 37 stranded ropes each of 25 bunchedwires in 3 layers applied in the samedirection of lay around a central rope.The lengths of lay for the inner, middleand outer layers are approximately 75,125 and 175mm respectively. Theconductor has a nominal diameter of17.2mm with a maximum of 17.9mm. theconductor is wrapped with a layer of0.023mm p.t.p tape with a maximumoverlap of 25 per cent. The conductorthen has an extruded p.v.c sheath ofapproximately 1.25mm radial thicknessapplied to protect the conductor fromcorrosion and mechanical damage. Thediameter over the p.v.c sheath of thecable does not exceed 20.5mm. Theconductor resistance per 1000m at 20°cdoes not exceed 0.208 ohms.

4. Selection of Clamps and Cables4.1 - Current RatingPortable earthing equipment for use inopen type H.V. substations consists ofLine End Clamps, Earth End Clamps,Earth Leads, Operating Poles andOperating Sockets. These componentsare suitable for assembly into sets ofearthing equipment and the minimumcurrent/time rating of one set is 17.5 kARMS for 2 seconds except that whenapplied to a 10mm diameter lineconductor the minimum current rating ofthe conductor/equipment combination is13.1kA for 2 seconds. The Clamps are

suitable for application to existing Lineand Earth End conductors of the sizesspecified.One set of earthing equipment, whichcomplies with the specified weightlimitations, is the maximum which canbe safely applied by a person of averagestrength. At locations where the faultcurrent level exceeds the specifiedcurrent/time rating of 17.5 kA for 2seconds it is intended that more thanone set of equipment be used. It shouldbe noted that with solidly earthedneutrals the single phase fault currentcan be up to 1.2 times the three phasefault current.

4.2 – Guide to Suitable Number ofLeads4.3 - Earthing Equipment subjected toFault Current in ServiceShould earthing equipment inadvertentlycarry a short circuit current it must bediscarded as there is no satisfactory wayof assessing its suitability for furtherservice.

5. Application of Earths5.1 - Earth End ClampsWhen manually applying and removingthese clamps only firm pressure by aperson of normal strength is necessaryto achieve good contact and tightness.Spring loaded clamps should betightened down until the spring is fullycompressed. Earth End Clamps shouldbe fastened securely in place before anyattempt is made to secure the Line EndClamp.5.2 - Line End Clamp – S9DOperating Socket OnlyWhen a clamp is raised to the busbar alocating lug on the clamp engages with ashort slot in the top of the socket. Assoon as the clamp is pulled down overthe busbar the lug is disengagedallowing the socket to turn, whilst thecross pin in its operating screw isretained within a long slot in the socket.The special contour of this long slot issuch as to give a fully positive tighteningaction whilst making it virtuallyimpossible for the clamp to become

inadvertently disengaged from the pole.It should be noted that at all times whentightening or loosening a clamp adownward pull should be maintained onthe pole. When the clamp is fullytightened the socket should be pushedgently up towards the clamp by 6.35mm(0.25in) at the same time maintaining thetightening pressure and the socket willautomatically become disengaged.For attachment, the operating poleshould be rotated with normal firm handpressure until a definite resistance tofurther movement is experienced. At thispoint spring loaded line end clamps willbe positively tightened and the springfully compressed.5.3 - Line End Clamp – CEA/S SocketOnlyThis socket is for application in thedownward direction, i.e., below thehorizontal, and for this reason is springloaded to ensure the clamp does not fallout of the socket inadvertently.

6. Maintenance of EarthingEquipmentIt is essential that earthing equipment ishandled and stored with care and isproperly maintained. The equipmentshould be inspected at maximumintervals of 3 months and immediatelyprior to application. The results of theregular inspection should be recorded.Clamps : Should operate freely andmoving parts should be lightlylubricated. Springs should be protectedby a heavy grease. Contact faces shouldbe clean.Flexible Cables : There should be novisible damage to strands of cables, andthe P.V.C sheath should be sound. Thejoint between the cable and terminationshould be secure and the componentsmust be in good condition. M12 boltssecuring cable termination to line endclamps must be tightened by applying atorque of 61 Nm.Poles : Should be inspected for damagewhich could lead to breakage of the polewhen lifting earthing equipment. Jointsbetween pole sections and socket mustbe in a sound condition. Poles should becleaned and re-varnished at appropriate intervals.

Acknowledgement is due to theElectricity Supply Industry forpermission to refer to and quotefrom ESI Standard 41-21.

Section 1

Prospective Single PhaseSymmetrical Fault Current

17.5 kA

31.5 kA

47.25 kA

63 kA

NumberofLeads

1

2

3

4

All sizes are in Millimetres


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sEar th End Clamps CE20/ESI-E1

Ear th End Clamp CE20/2

Ear th End Clamp CE21

Line End Clamp CE22A/ESI-L1

Fig. 1 CODE CE20/ESI-E1Earth End ClampFor application to clean or dirty copper or aluminium strip.Maximum Thickness 6.5mmMinimum Thickness 3.2mmMaximum width 50mmMinimum width 38mmProvision for attachment of one flexible lead as in Fig. 13.

NOTE: When secured the spring shall be fully compressed and this shall be readily visible.

Tested to 17.5 kA for 2 secs.

Fig. 2 CE20/2 Earth End ClampDesigned initially for use with mechanical aids to the application of portable earths,also readily compatible for use in portable earthing applications.For application to clean or dirty copper or aluminium strip.Maximum thickness 6.5mmMinimum thickness 3.2mmMaximum width 50mmMinimum width 38mmProvision for attachment of two flexible leads as in Fig.13.


Tested to 38 kA for 2 secs.

Fig. 3 CE21 Earth End ClampFor application to clean or dirty copper or aluminium strip.Maximum thickness 13mmMinimum thickness 3.2mmMaximum width 50mmMinimum width 25mmProvision for attachment of one flexible lead as in Fig.13.


Tested to 17.5kA for 2 secs.

Fig. 4 CODE CE22A/ESI-L1Line End ClampFor application to clean or dirty copper or aluminium tube, within the range:-10-38mm diameterProvision for attachment of one flexible lead as in Fig 13.

NOTE: For attachment the operating pole should be rotated with normal firm handpressure until a definite resistance to further movement is experienced.


127Max width 70 mm

Max width 44mm

Cable Ends

147

103

127

125

100

Cable Termination

Max width - 63.5

203 max

230

Max width 44mm

127

104

Cable Termination

103

Max


Line End Clamp CE22B/ESI-L2

Line End Clamp CE22C/ESI-L3

Line End Clamp CE22 A+B

CE16/5/ESI-L4

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Fig. 6 CODE CE22C/ESI-L3Line End ClampFor application to clean or dirty copper or aluminium tube, within the range:-60-90mm diameterProvision for attachment of one flexible lead as in Fig 13.



Fig. 8 CE16/5/ESI-L4For application to aluminium tube 127mm diameter only. Provisions for attachment of three flexible leads as in Fig.13.

Tested to 50kA for 3 secs.

Fig.5 CODE CE22B/ESI-L2Line End ClampFor application to clean or dirty copper or aluminium tube, within the range:-38-76mm diameter Provision for attachment of one flexible lead as in Fig 13.

NOTE: For attachment the operating pole should be rotated with normal form handpressure until a definite resistance to further movement is experienced.


Fig. 7 CODE CE22C/A+BLine End ClampFor application to clean or dirty copper or aluminium tube, within range:- 19-76mm diameter.



Max width = 63.5

Max width = 63.5

270 max

230

235

Max width = 81

238

Cable end

208 325Max width = 51

187

245 max

230


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CE16/5.5/ESI-L5

CE25

CE50&CE51

Fig. 9 CE16/5.5/ESI-L5For application to aluminium tube 140mm diameter only. Provisions for attachment of three flexible leads as in Fig.13


Fig. 11 CE50 & CE51CE50 for application to aluminium tube 190 to 200mm diameter andCE51 for application to clean or dirty aluminium tube 140 to 160mmdiameter.Provision for attachment of two flexible leads as in Fig, 13.


Fig. 10 Code CE25 Line End Clamp (Mechanical Aid)Designed specifically for use with mechanical aids to the application of portableearths and to permit the raising of two earthing leads.For application to clean or dirty copper or aluminium tube.Maximum diameter 75mmMinimum diameter 35mmProvision for attachment of two flexible leads as in Fig.13


Tested to 38 kA for 2 secs.

Cable Ends (3)

Max width = 133

197

X

Z m

ax

Max width = 133 Y

ESI – T1(x2)

Fig. 12 CE57 Earth Tape ClampFor application to damaged aluminium or copper earth tapes in aclean or dirty condition, ranging from 25 x 3mm to 100 x 6mm.Providing a drain earth before fitting a bridging earth suitable forfault protection.

272 - max

M10 screws

145

- max

1945

Conductor Range100 x 6 max25 x 3 max

CE57

229(

9”)

Cable Ends

238 (9.375”)

Max. width = 133 (5.25”)

Clamp X Y ZCE50 269 348 493CE51 240 310 455

368

262


Ear th ing Lead ESI-C1-2T1

Operat ing Socket CEA/S:ES1-S2

ESI/T1

Operat ing Socket S9D:ESI-S1

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Fig. 13 Code ESI-C1-2T1Earthing LeadTo be terminated only with terminations as Fig 14.For attachment to earth end and line end clamps as in Figs.4 to 11 inclusive.


Length as required.

Fig 15 S9D:ESI-S1 Operating SocketFor attachment to glass fibre operating pole as in Fig.17 and application of line end clamps as in Fig. 4 to 11 inclusive.

Fig. 16 CEA/S:ES1-S2 Operating SocketFor attachment in glass fibre operating pole as Fig. 11 and application of lineend clamps as in Figs. 4 to 11 inclusive.

Fig. 14 Code ESI-T1Compression Termination to suit 150mm2 Aluflex.Compress to 22.73 A/Fx 76.2mm Bite Length.

All sizes are in Millimetres unless otherwise stated

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Operat ing Poles ESI-P1

Fig. 17 CODE ESI-P1 Operating PolesEarthing poles should be limited to a maximum length of 16ft.(4.88m) and may bemade up in either of the following alternatives:-ALTERNATIVE ‘A’Top – Item 1– 8ft(2.44m) long single section.Bottom–Item 2– 8ft(2.44m) long single section with end plug, item 5.

ALTERNATIVE ‘B’Top – Item 1– 8ft (2.44m) long in 2x4ft (1.22m) long sections permanently joined by a chain. Intermediate or Bottom – Item 4 – 4ft (1.22m) long.End Plug – Item 5 – only supplied when specified on order.

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Section 2

Portable Earthing Equipment for Overhead Lines

This equipment is specifically portable earthing for use on 132, 275and 400 kV overhead line conductors during erection and maintenance work. It is designed to be as light as possible,employing aluminium alloy clamps, aluminium earthing leads andglass fibre operating poles. These have been developed in conjunction with The National Grid Company Limited and are currently included in their Standard 43921 TPS 1/113 (OverheadLines), Or NSI4 (Work on High Voltage Overhead Lines).

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1. ScopeThe complete range, and details of thisequipment will be identified andillustrated in Figs. 1 to 14 inclusive, atthe end of section 2.

2. Design and ConstructionAll clamps are designed with an ultimatestrength well in excess of normalworking loads, and all designs are typetested at normal loading before beingapproved for production. Theconstruction of all equipment is of arobust nature and will withstand areasonable amount of rough handling.

3. Equipment3.1 Earth End Clamp Code CE10/A1(Standard) Fig.1For direct application by hand to towersteelwork. The large thumb screw of thisdevice has a captive hardened steel tipwhich penetrates through painted,weathered or non conductive surfacesand indents into steel work ensuring astrong efficient connection to earth.3.2 Earth End Clamp Code CE18/A(Bridging) Fig. 2For earthing line conductor over tensionset insulators to tower arm couplingduring maintenance, bolts to coupling

through clearance hole for arcing hornbolt which is removed prior to earthing.3.3 Line End Clamp Code CE52/A(Normal Type) Fig. 3Intended to be applied only by means ofan operating socket attached to aninsulated operating pole in either upwardor downward direction. Spring loadedjaws enable clamp to be slipped easilyover the line conductor and retainsclamp in position whilst operating screwis being tightened/loosened.3.4 Line End Clamp Code CE13/A(Angled Type) Fig. 4As above but designed to be applied innear horizontal position from tower crossarm over tension set insulators to lineconductor.3.5 Line End Clamp Code CE23/A(Running Earth) Fig. 5Designed specifically for earthing lineconductors during "Stringing"operations. Enables cable to run freelybetween contact roller faces whilstproviding a positive contact to earth.3.6 Operating Socket Code OL1Fig.10Made in light alloy material with internalspring loaded plunger which maintainsgrip pressure on the inserted operatingscrew, holding both screw and clamp

rigid whilst being directed into position.3.7 Operating Poles Figs. 12,13,14Made in strong glass fibre material inaccordance with C.E.G.B. Specification43921. Supplied as single 2.4m (8ft)section complete with operating socketor as 2.4m (8ft) heavy duty telescopicextending to 4.8m (16ft) with twointermediate positive stop positions.Lengths of the telescopic poles can beincreased further by use of a single 1.8m(6ft) extension pole, supplied whenspecified. Carrying slings for telescopicand extension poles can be supplied asoptional extra.3.8 CE60 ‘Sparrow’ Plate Fig 8Multiple earth tower bonding platedesigned for control of induced currents.Manufactured from aluminium alloy andprovided with location for up to twelveportable drain earths fitted with PB50Fferrule type terminations. Also providedwith bolted connections for up to fourinterconnecting earth leads. Sixthumbscrews with (replaceable)hardened tips for effective bonding to thetower structure are also incorporated.3.9 CE61 ‘DEAS’ Bar Fig .9Developed by the National GridCompany as an earthing bar for use inthe arcing horn bolt hole of the earth side

insulator string arrangement, whenlowering off tension set insulators. Madefrom aluminium alloy, this equipmentmay be used in conjunction withCE52/A, CE31/A Line End Clamps,CE10/A1, CE10/A Earth End Clamps andCE18/A Bridging Earth.3.10 Earthing LeadsFlexible conductors are of commerciallypure aluminium wires in the H68condition. The conductor is wrappedwith a layer of P.T.P. tape and coveredwith an extruded clear P.V.C sheath.Earth End to Line End Clampinterconnecting leads are 50mm2

nominal sectional area. These areterminated by PB50F type ferruleterminations. Flexible clear P.V.C stressrelieving sleeves are fitted to preventexcessive wear about the compressionjoints, which can occur due to windoscillation in service.Earth leads are 120mm2 nominalsectional area are terminated by PB120palm type terminations. Flexible clearP.V.C stress relieving sleeves are fitted toprevent excessive wear about thecompression joints.

Section 2

Ear th End Clamp CE10/A1

Ear th ing End Clamp (Br idging) CE18/A

Fig. 1 Code CE10/A1

Fig. 2 Code CE18/A

32

60

144

6.35

PB50F Ferrule or Bared 50sq.mmAluflex

11 m

ax

51

8392

54

312/0.45mm (50mm2)Earthing Lead

12.4

Dia


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Line End Clamp CE52/A

Running Ear th CE23/A

Lug PB50 Ferrule PB50F

Fig. 6 Code PB50Compression Termination to suit 50mm2 AluflexCompress to 15.5mm A/F x 30mm Bite Length.

Fig. 7 Code PB50FFerrule TerminationTo suit 50mm2 AluflexCompress to 15.5mmA/F. Bite Length 35/37mm

Fig. 5 Code CE23/A

Fig. 3 Code CE52/AConductor range 13 to 42mm diameter.

125 max48

275

max

Flexible Earth lead 50mm2

Aluflex fitted on site (O.D.12.4)or PB50F Ferrule (Fig. 7)

336

Max width =103

127

406

Use barbatia No. 2 contact grease

or similar

Max diameter = 42

12.4 Dia

312/0.45mm (50mm2)Earthing Lead


CE60 Sparrow Pla te

CE61 Deas Bar

Socket OLI

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Fig. 8 Code CE60Used to provide a common point of connection for portable drainearths that will permit the safe and effective control of inducedcurrents and voltages.

Fig. 9 Code CE61Used for connecting into thearcing horn landing hole toprovide a temporary point ofconnection for partial bridgingearths and drain earths whenlowering off a string of insulators.

Fig. 10 Code OL1Socket for Operating Clamps with Long Taper Operating Screws

420

230

150

100

305 nom



Telescopic Pole

Br idging Ear th Pole

Extension S

EC

TIO

N 2

Po

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39.7 Dia(1.562”) Dia

Nonslip grip

304.

8(1

2”)

1,83

0(6

’-0”)

Pole Closed Pole Open

152 (6”) Min.width collars toprevent innerpole pulling out

Non slip grip

Fully close locking peg2,500 (8’-6”) Total

4,000 (13’-0”) Total

Intermediate Positions

4,400 (14’-5”) Total

35 (1.375”) O.D28.5 (1.125”) I.D

Fully extended locking peg4,830 (15’-10”) Total

44.5 (1.75”) O.D38.7 (1.562”) I.D

304.

8(1

2”)

A

B

C

D

Single Sect ion Pole

Fig. 12 Fig. 13

Fig. 14

46 DIA(1.812”)DIA

83.4

(3.2

81”)

2440

Sec

tion

(8’-0

”)

force to compressspring 9lb min (40N)

10lb max (45N)

Fig. 11Single section LightweightGlass Fibre Pole.


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Section 3

Fixed Earthing Devicesfor Sub-Stations

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1. Scope,AcknowledgementsThis equipment covers fixed devices forearthing 132kV sub-stations having faultlevels up to 5,000 MVA and 275 kVsubstations having fault levels up to15,000 MVA. It was designed anddeveloped by P&B in conjunction withthe CEGB and is manufactured to theCEGB Standard TPS 3/4 (Switchgear).Acknowledgement is due to theElectricity Supply Industry forpermission to quote form the Standard.2.Design and ConstructionEach earthing device consists of a singlephase assembly shown typically in Fig.1and having the following features:The operating pole is a glass fibre polelocated vertically in two or more guides.The lower guide has a bolt which isnormally located in a hole in the pole,thus preventing the pole from beingraised. The bolt can be withdrawn onlywhen freed by use of a conventionalinterlock key or padlock key.A double hooked line end clamp ispermanently attached to the top of thepole. One or two cables according torating are permanently attached to the

line end clamp and to the nearest earthbar.A special earth bar clamp has beendeveloped which is suitable for attachingto existing copper earth bars to give afully rated permanent connection. A hole8.73 mm diameter (11/32") is requiredfor each clamp. Ensure that the earth baris clean back and front. If attaching tonew earth bar secure aluminium orCopper/aluminium compressionterminal direct to clean (tinned in thecase of copper) earth bar by 12.7mm(1/2") diameter bolt through 8.73mmdiameter hole ensuring that ‘shoulder’ onfitting is hard against the edge of theearth bar.The guides are attached to suitable steeladaptors which secure the equipment toconvenient parts of structures providedfor main equipment. They vary with thenature of the structure and are notsupplied by P&B but a range of steeladaptors suitable for most applicationsis included in CEGB Standard TPS 3/4.Interlock boxes for standard locks with16mm (5/8") long stubs are available forsingle way or three way arrangements.The single way boxes will normally be

fitted to two phases and the multi-waybox to the third phase. Any number oflocks can be added to the multi-way bymeans of extension boxes.If required the equipment may beinstalled without interlocks but withprovision for padlocking in the "OPEN"position only.The "lift" of the pole is limited by thedistance between the bottom guide andthe ground, so that where the initial “lift”is insufficient, one or two extensionpoles are required. These extensions areof light weight glass fibre with snapaction sockets. A simple resting device isavailable which permits the pole to besupported at suitable locations so thatboth of the operator’s hands are free forfitting and removing extension poles.The line end clamp is suitable for rigidcircular conductors or stubs of anydiameter between 38 to 76mm (11/2" to3") and is provided with one of threesettings as required. The conductor orstub must be substantially horizontal. Aseries of busbar spigots are availableeach suitable for a prescribed positionwhere the busbar is not substantiallyhorizontal or the busbar consists of a

stranded conductor.See Section 6. Special attention has beenpaid to the prevention of accidental ordeliberate defeat of the interlockingsystems.All current carrying parts are of copper orcopper based alloys. Other metal partsare stainless or galvanised steel. It is notanticipated that there should be anydeterioration of the equipment due tobeing located permanently outdoors butglass fibre poles may require to berevarnished from time to time.3. Technical ApplicationThe equipment has been fully tested forthe fault ratings to be found on theCEGB’s systems. For fully interlockeddevices only one cable per phase isrequired irrespective of the fault level.For padlocked equipment flexible earthleads must be provided according to therating listed in Table 1.4. Supply of ComponentsThe components supplied by P&B are asshown in full on Fig .1.The interlock locks and keys are notincluded.

System Voltage kV

132132132275275

Rated Fault Level Three PhaseSymmetrical MVA

250035005000750015000

Maximum Single Phase Fault Current r.m.s.kA

11.015.426.315.831.6

No. of Cables

11212

Cross Sectional Area ofCable/s Sq. In.

0.1250.1250.1250.1250.125

Table 1


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Fig 1

Aluminium or Copper Busbar

Label CarrierAluminium Earth Lead

Earth Clamp only supplied ifrequired. (See Plant Standard)


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Section 4

General Purpose Earthing Equipment

Use wi th Opera t ing Screw GS1 Opera t ing Screw SE

Code SESquare Ended Operating Screw

Code GS1Socket for operating Clamps WithSquare Ended Operating Screws


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Codes for Clamp Types, Material, Operating Screws and Earth LeadAttachments:-

MaterialCode/A AluminiumCode/B BronzeCode/MI Malleable IronCode/MS Mild SteelCode/SS Stainless Steel

Operating ScrewsCode/SE Square ended Operating Screw/GS1 SocketCode/LT Long Taper Operating Screw/OL1 SocketCode/ST Short Taper Operating Screw/CEA Socket or S9D SocketCode/RT Ring Type Operating Screw/RT SocketCode/SP Special Operating Screw AssembliesCode/SH Short Insulated HandleCode/LH Long Insulated HandleCode/HW HandwheelCode/TB Tommy BarCode/TS ThumbscrewCode/HCP Hand-Operated Cross Pin

Earth Lead AttachmentsCode/105H 10.5mm hole for bolted Earth Lead AttachmentCode/135H 13.5mm hole for bolted Earth Lead AttachmentCode/JCA Jumper Connector Aluminium

Please refer to our Sales Dept to Discuss your Particular Requirements


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Operat ing Screw LTOperat ing Socket OL1

Hook Type Socket Opera t ing Screw RT

Code LTLong Taper OperatingScrew

Code OL1Socket for Operating Clamps with LongTaper Operating Screws

Code RT SocketSocket for Operating Clamps with Ring TypeOperating Screws. Hook is spring loaded toensure clamp is securely retained duringapplication.

Code RTRing Type Operating Screw.


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Shor t Taper Opera t ing Screw ST

Socket CEA

Socket SL

23

Code STShort Taper Operating Screw

Code CEASocket for Operating Clamps with Short Taper Operating Screw(Spring Loaded)

Code SLSliding Socket for Operating Line Clamps with Short TaperOperating Screws.


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Tommy Bar type Screw TB Hand Opera t ing Screw HCP

Thumb Screw TS

22

Code TB Code HCP

Code TS

Insula ted Handles

Code SH or LHAvailable in Colours Grey, Red,Orange & Yellow.

Available lengthsSH = 115LH = 250 or 350

115

X

30


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Ear th End Clamps CE3

Line End Clamp CE4

Line End Clamp CE5

Ear th End Clamp With Handwheel CE5/HW

Code CE3

Code CE4For 22mm to 50mm diameter conductors

Code CE5For 12.7mm to 25.4mm diameter conductors

Code CE5 HWSpecial assembly for 12.7mm to 25.4mm diameter conductorsCode CE5/B/HW/135H

101.6

50.8

16.7

31.8

76

9090

131

max

76

116 Max

80


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Line End Clamp CE7



Line End Clamp C12

Code CE7For 4.2mm to 19.5mm dia conductors

Code CE8For flat bars 38mm wide x 6.35mm thick (suitable for steel cross arm straps).

Code CE10

Code CE12

For 20mm thick bars and up to 15mm diameter round conductors.

Tested to 17.5kA for 2 seconds.

35 80

35

35 32

16.5 52

90 43

90

8434

206

max

45

57


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Line End Clamp CE15

Line End Clamp CE27

Ear th End Clamp For Pole Opera t ion CE29

Code CE15 For 90mm diameter conductors.Provision for attachment of two flexible leads.

Code CE27For 101.6mm diameter conductors.


Code CE29Suitable for cross arm straps

L ine End Clamp CE33

Code CE33 For 4.7mm to 15mm conductors.L.V. Line shorting and by-pass jumper connector.

ESI-CI-2TI

187

(7.3

75”)

Max. width = 135

173

295

Cable EndMax. width = 51

208325

187

(7.3

75”)

3545

35

115

ø30

250

366 max

102


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Line End Clamp H1B

Code CE35Suitable For:-‘T’ Bar Earthing StubsBall Type Earthing StubsFlat Bar:-Max Thickness 12 mmMin Width 31 mmRound BarMax 25 mm DiameterMin 12 mm Diameter

Tested at 17.5 kA(indoor use only)

Code H1B H1B LIve Line TapConductor range 5.7 to 11.0mmdiameter.

53.2

15.8

28.6

44.5

7.2

137

max

25.4

12

5

245 max

46

60

98 (n

om)


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Ear th End Clamp S9A

Ear th End Clamp S9A

Ear th End Clamp S9B

Ear th End Clamp S9C

Code S9A /A/TB/PT/135HFitted with Hardened Steel Tip.For up to 20mm thick bars.


Code S9A /A/–/RB/135HFitted with Aluminium Alloy Rocker Block For 12.7mm thick bars and for 6.4 to 20mm round conductors.


Code S9B For 6.3mm to 38mm diameter conductors.


Code S9CFor 38mm to 76mm diameter conductors


146

max

76

76

111

111

159 max

120

168

max

216 Max

Max width = 50mm

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Section 5

Portable Earthing EquipmentFor Electro-Static Precipitators

This equipment is specifically portable earthing for maintenance onelectrostatic flue-gas precipitators in generating stations and localauthorities waste disposal units.It has been designed to provide safe and sure clamping to the specialstubs (Fig.1) which are fillet-welded into the appropriate positions on tothe precipitator electrode frame in accordance with BS5135.

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Stub ST/M.S/225/1

Ear th Clamp CE10/GS

1.ScopeThe equipment illustrated in Figs 1 to 6 providesportable earthing for maintenance in accordance with theCEGB Safely Rules and National Safety Code of PracticeSR-EM 21.

2.Design and ConstructionBoth Line end clamp and earth end clamp are designedwith an ultimate strength well in excess of normalworking loads and all designs are type tested at normalloading before being approved.

3.Equipment3.1-Line End ClampThis is designed to make positive line contact with thespherical stub no matter what the angle of applicationand it should be applied by means of the operatingsocket Fig 6 attached to the appropriate insulatedoperating pole.

3.2-Earth End ClampThis should be applied by hand to the appropriate earthbar to the maximum torque possible without the use ofmechanical aids.3.3-Operating SocketMade in light alloy and illustrated in Fig 6 and is fittedwith an enclosed spring to give a positive hold to theconductor clamp when it is being applied.3.4-Operating Poles – InsulatedThese are limited in length to a maximum of 2440mm.There are two types.1.A 1220mm long top section fitted with the appropriatesocket, plus a 1220mm bottom section Figs 7a & b.2.A 2440mm long telescopic pole also fitted with theappropriate socket but capable of closing down to 1220mm for ease of transportation. Fig 7c.3.5-Earth LeadsOnly cables by approved manufactures and fitted withapproved compression lugs shall be supplied for the

earthing lead connection between the conductor clampsand earth end clamps.The flexible conductor shall be stranded 312/0.45mmaluminium (50mm2 aluminium) with clear /greentranslucent PVC sheathing to an overall diameter ofapproximately 12.4mm.

4.Certification of clamps and cables.All completed equipment i.e. conductor clamp, earthclamp and interconnection lead are to be subjected to aresistance test as appropriate.All measurements in milimeters

Fig. 1. CodeST/M.S./225/1Stub – Weld on type

Fig. 2. Code CE10/GS/A/225/3Earth End ClampMax Conductor 15.9 mm (5/8’’)

Spherical

24 Dia

25.4 Dia

11 Dia

40.5

9.5

3

45 0

1.5 RAD

6.35 RAD

110

(max

)

123.8

16.7


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LIne End Clamp CE30

Bal l Stub Bol t on

T/Bar Stub

Fig. 3.Code CE30/SS/225/2Line End Clamp

Fig. 5.Bolted type T/Bar Stub.

Opera t ing Socket GS1

Fig.6.Code GS1/A/225/4Operating Socket.

23 44

M12

16

50

25.4

Sphe

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4423

M12

Fig. 4.Bolted type Ball Type Stub.


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Pole Sect ions

(a)

(b)

Fig. 7. (a) Code GFP4/TSTop Section Pole

(b) Code GFP4/BSBottom SectionExtension Pole

(c) Code GFP4/BTELTelescopic Pole

(c)

CORSHAM WILTSHIRE ENGLAND

CORSHAM WILTSHIRE ENGLAND


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Section 6

Earthing Stubs


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Type A Aluminium

Type A Bronze

1.ScopeThe stubs illustrated in figures 1-11inclusive may be mounted in stipulatedpositions in the appropriate aluminiumor copper substations.2.DesignThe stubs are designed with bolt fixingcentres of 127mm P.C.D. or 178mmP.C.D. according to their appropriatemounting positions. Check if the typerequired has the correct fixing centres forthe position in which it is to be mounted.

3.Mounting1. The stubs must be mounted instipulated positions in the appropriatealuminium or copper busbarsubstations.2. On 275 kV or 400 kV substations,where the stubs are not located belowand parallel with the busbar, coronashields may be fitted as an integral partof the stub. See Figure 11.This applies to aluminium stubs only.

Notes:a) Stub lengths other than thoseillustrated on request.b) Apply NGC standard jointingprocedure when fitting to switchgearequipment.

Fig. 1.Code A/127/X290/ALSuitable for 275kV (15000MVA) RCP Isolators and 132kV (5000MVA) posts and isolators.

Code A/127/X230/ALSuitable for portable Earths

Fig. 2.Code A/127/X495/BZSuitable for 275kV (15000 MVA) R.E.P. isolators

Code A/127/X290/BZSuitable for 132kV (5000MVA) posts and isolators

Code A/127/X230/BZSuitable for portable Earths

Type B Bronze

Fig. 3.Code B/178/X40/BZSuitable for 275kV (15000MVA) posts

Code B/178/X460/BZ

Code B/178/X290/BZGeneral purposes

40 D

ia

(1.5

7”)

385 (15.16”)290 (11.42”)

160

(6.3

”)18

0 (7

.09”

)

4 equi-spaced slots 18 (0-71”) wide on 127 (5”) p.c.d

160

(6.3

”)18

0 (7

.09”

)

40 D

ia

(1.5

7”)385 (15.16”)

495 (19.49”)

40 D

ia

(1.5

7”)



230

(9.0

5”)

180

(7.0

9”)

410 (16.14”)420 (16.53”)


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Type B Aluminium

Type C Aluminium

Type D Aluminium

Type E&M Bronze

Fig. 4.Code B/178/X290/ALSuitable for 275kV (15000MVA) posts

Fig. 5.Code C/90/X230/AL

Code C/90/X165/AL

Fig. 6.Code D/63.5/X230/ALFor isolator or circuit breaker head

Fig. 7.Code E/75/X410/BZCode M/38/X203/BZ

40 D

ia

(1.5

7”)


290 (11.42”)

180

(7.0

9”)

420 (16.53”)

230

(9.0

5”)

502 (19.76”)

410 (16.14”)

40

177.8 (7”)

133.

35 (5

1 /4”

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Type H Aluminium

Type K Aluminium

Type L Aluminium

Corona Shie lds


Fig. 8.Code H/140/X381/AL

Code H/165/X381/ALSuspended types for 140 diam. and 165 diam. busbars

Fig. 9.Code K/63.5/X254/ALFor portable EarthsMounting: Isolator or circuit breaker head

Fig. 10.Code L/69.85/X445/AL

Code L/69.85/X470/ALSuitable for fixed earthing devicesMounting: Isolator head

Fig. 11.Code CS/AlAvailable as integral or Bolt-on Type for 275kV. Available as Bolt-on Type for 400 kV.


Notes

PB Weir Substation Earth End Clamps - CE22-BESI-L2 & CE20-ESI-E1

Technology

Transcript of PB Weir Substation Earth End Clamps - CE22-BESI-L2 & CE20-ESI-E1