INSTRUCTIONS AN©RECOMMENDED PARTSFOR MAINTENANCE

GEK-39672CSUPERSEDES GF.K -39672B

/J

POWER/VAC* METAL-CLAD SWITCHGEARTYPES VM-4.16 AND VM-13.8

FOR VACUUM CIRCUIT BREAKERTYPES VB-4.16, VB-7.2 AND VB-13.8i

s.

.* - ! -V*»-r?4-V.. i l-v

V3 (

y•:

•: •

•* <••••">« f?: .• *:

ill• ?£ i

a*

( Os: . !m \

r •.-''• i- « 't 11 * • -*• .:* ap

- V V. . :* < J

& • V>:v

I.2->£

.

4. -: :t? ' A;w;;* *.*.mm

i: .*a • ••«.

<•.

?pS

r ..\ T'i% ' 4 j

$ / J.3 'V- >:•-ii * •/

i • • :«!:’’’’ r. .> .*•- •:•:

*i, ,l:K • •V :V

<?- J: '* -a* • •

•; ’ •.=

*%[ my-•< it

•S •

$

”• “ :

>:• !-r : •V Sj"

- A -/'T.

* .•7^^.r . 1

«• •v\ . : i s, • *•:'• .

pr

-v,. ’-gj&r

: •’ v

» i1 :.

• »•:

' v;vv.;.

iV G E N E R A L E L E C T R I C£%

%

I

CONTENTS

Page

5Introduction5

Receiving, Handling & Storage . .ReceivingHandlingStorage of Indoor Equipment .Storage of Outdoor Equipment

5999

15DescriptionSecondary EnclosurePrimary EnclosureBreaker Removable ElementBreaker Lift TruckBreaker Racking MechanismRemote Racking DevicePrimary DisconnectsBus Compartment . . . . . '

Current Transformer CompartmentPrimary Termination SpacePotential TransformersCurrent Limiting Fuses and Control Power TransformerDummy Removable ElementGround and Test Device .

1515151517171719191919192020

21InstallationLocationAnchoring .

Indoor Equipment - Floor PreparationOutdoor EquipmentOutdoor Equipment With Protected AisleOutdoor Equipment With Common Aisle

Breaker Removable Element .Test CabinetAddition of Units to Existing Equipment . .ConnectionsMain Bus AssemblyTaped Joints for 13,8 kV EquipmentTaped Joints for 4.16 kV EquipmentBus DuctPrimary CablesInsulating Primary Cable TerminationsPotheadsTermination Without PotheadGround Fault Current Transformers (Through — Type)Control CablesGround BusLightning ProtectionSurge SupressorsRoof Entrance Bushing ;

2121212222222223232325252626272828282829

.292929

v . 29

2

Page

Testing and Inspection 321-J Operation

Breaker Installation .Breaker Racking with Front Door ClosedRemote Racking AttachmentPositive InterlockNegative InterlockSpring Discharge InterlockInterference InterlockClosing Spring Gag InterlockKey LockPadlocksStationary Auxiliary SwitchBreaker Position SwitchSpace Heaters

MaintenanceRecommended Annual Maintenance . . .Outdoor Acrylic Paint Finish

3232333333343435363636363636373838

Renewal Parts 39

i.

3

LIST OF ILLUSTRATIONS

PageFigure

Typical Indoor Power/Vac* Metal-dad Switchgear EquipmentTypical Outdoor Power/Vac* Metal-clad Switchgear Equipment. .Typical Outdoor Power/Vac* Metal-clad Switchgear Equipment with Protected AisleTypical Outdoor Power/Vac* Metal-clad Switchgear Equipment with Common AisleInstallation Details for Indoor Power/Vac* Metal-clad SwitchgearInstallation Details for Outdoor Power/Vac* Metal-clad SwitchgearInstallation Details for Outdoor Powcr/Vac* Metal-clad Switchgear withProtected AisleInstallation Details for Outdoor Power/Vac* Metal-clad Switchgear with Common AisleSide Section View Power/Vac* Metal-clad SwitchgearPower/Vac* Breaker and Lift TruckRemote Racking DevicePrimary Disconnects 1200, 2000, 3000 Amp .Potential Transformer Drawout CarriageControl Power Transformer Drawout Carriage .Test CabinetOutdoor Metal-clad Switchgear — Addition of Units to a Line-upOutdoor Metal-clad Switchgear with Protected Commoii Aisle — Addition of Units to Line-UpBolt Torque Values for Metal-clad SwitchgearBus Insulating BootInsulation of Connection BarsBus Duct GasketsInstallation of Primary CablesCable Termination without Pothead, Single-conductorRear View of Unit Showing Through-type Current TransformersControl Cable GuideTaping of Roof Entrance TerminationRacking Mechanism .Lift Truck Connection to RailsRacking Arm Position IndicatorPositive InterlockNegative InterlockKey Lock and PadlocksClosing Spring Discharge InterlockInterference InterlockStationary Auxiliary Switch and Breaker Position SwitchRight Hand Track Assembly for Vacuum Metal Clad .Left Hand Track Assembly for Vacuum Metal CladSpreader Bar , Chain and Idler Sprocket for Vacuum Metal CladConnection Boots for Primary Disconnects, Surge Suppressors, and Bus4.16 kV Inter Unit Barrier13.8 kV Inter Unit Barrier4.16 kV Primary Disconnect13.8 kV Primary DisconnectVacuum Metal-Clad Breaker Unit

616273 74 8,95 10,116 12,13

14,1578 169 1610 1711 1812 1913 1914 2315 2416 2417 2518 2519 2620 2721 2722 2723 2924 3025 3026 3127 3128 3329 3430 3531 3532 3633 3634 3735 3936 4037 4038 41 '

39 4140 4241 4242 4243, .4344

4

POWER/VAC* METAL-CLAD SWITCHGEARTYPES VM-4.16 AND VM-13.8

FOR VACUUM CIRCUIT BREAKERSTYPES VB-4.16, VB-7.2 AND VB-13.8( .J

INTRODUCTION

equipment is built into a weatherproof housing as in Figs. 2, 3and 4. The equipment is not designed for exposure to drippingliquids as this condition is not a usual ANSI service condition.Dripping liquids can destroy the integrity of the insulationsystem and must be avoided.

Metal-clad switchgear is equipment designed for the pro-tection, instrumentation and control of various types ofelectrical apparatus and power circuits.

\ The switchgear consists of one or more vertical sections/ which are mounted side by side and connected mechanically

and electrically together to form a complete switchingequipment. Typical equipments are shown in Figs. 1, 2, 3 and

>* •

&

NOMINALINTERRUPT-4.

TYPEEQUIP- CIRCUITMENT BREAKER

MAXIMUMVOLTAGE

CONTINUOUSCURRENTAMPERES

INGThe circuit breakers are easily removable to provide maxi-mum accessibility for maintenance with minimum interruptionof services. The switchgear is designed to provide a high degreeof safety to the operator. All equipment is enclosed in groundedmetal compartments.

CAPACITYMVAKV

VM-4.16 VB-4.16-250VM-416 VB-4.16-350

4.76 1200-20001200-2000

2504.76 350

3000The equipment is available in the ratings listed in thefollowing table. The ratings of the equipment and devices arebased on usual service conditions as covered in ANSI stan-dards. Operation at currents above the equipment rating willresult in temperature rises in excess of these standards, and isnot recommended. For outdoor installation the same basic

VM-13.8 VB-7.2-500VM-13.8 VB-13.8-500VM-13.8 VIM 3.8-750VM-13.8 VB-13.8-1000

8.25 1200-20001200-20001200-20001200-2000

50015.0 50015.0 75015.0 1000

3000

RECEIVING, HANDLING AND STORAGE

packed in one of the cases. The case is especially marked andits number can also be obtained from the Memorandum ofShipment, To avoid the loss of small parts when unpacking,the contents of each case should be carefully checked againstthe Packing Details before discarding the packing material.Notify the nearest General Electric Company representative atonce if any shortage of material is discovered.

RECEIVING

Every case or crate leaving the factory is plainly marked atconvenient places with case number, requisition number,customer's order, front or rear, and when for size and otherreasons it is necessary to divide the equipment for shipment,with the section numbers of the portion of equipmentenclosed in each shipping case.

Before leaving the factory all elements are carefullyinspected and packed by workmen experienced in the properhandling and packing of electrical equipment. Upon receipt of

The contents of each package of the shipment are listed inthe Packing Details. This list is forwarded with the shipment,

These instructions do not purport to cover all details or variations in equipment nor to provide for every pos-sible contingency to be met in connection with installation, operation or maintenance. Should further informationbe desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, thematter should be referred to the General Electric Company.

To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards; butno such assurance is given with respect to local codes and ordinances because they vary greatly.t% , J

^Registered Trademark of the General Electric Company 5

aIT)

T*HC\oo

on

Typical Outdoor Power/Vac* Metal-Clad Switchgear EquipmentFig. 2

6

I • §

00COXt00

ON00

COob

'I-v \ "

i

x i * • i• • s"- >’

y :? •

i

:*

Fig. 3 Typical Outdoor Power/Vac* Metal-Clad Switchgear with Protected Aisley • .j

Ux

.* -i

Fig. 4 Typical Outdoor Power/Vac* Metal-Clad Switchgear with Common Aisle

7

LIFT- 5UNG SPREA.DER

<! #-!

y'+ *11 o

£J FIo>i

iii oII I I__L_LJI :

L-J—J— JT rrr VTJii i i iiii il ii i i i >i ii (I 1L. ii

OsO<NO

r"i ri, i ii LJ i-J. i ohI I

irHvuIL

SIDE VIEWFRONT VIEW

LIFT JACK

-CABLE LOOPLtFTjSSlVE

LIFTIN6ANGLE

-T

OPTIONAL METHOD-AIR-LIFT JACK.\Li.jj i 1CABier LOOP!

i CROSS LIFTINGi

I 1- SI}j—r —r—i :! I iiiI L- -.L I L,,I„J .J uJACKING TIMBER, Tr-UFT JACK.

\ 4 COftNCB;•+

LIFTINGANGif ^ +—r 'Tr* *i inR ;i +

J7

+ion :O Iy

mmm OPTIONAL METHOD -AA-TT (T FIn n- FOR MOi/EMBNT-J.tt.WJA DlR^QT\Q ° t USB ROLLER5.

EACH QQLLE& MUST SUPPORT THE FfiOf /7 MIDDLE £R5t)R£l££RlhmN£iS>

"YP/CAL JACHltJo £g£&i

Installation Details for Indoor Power/Vac* Metal-Clad SwitchgearFig. 5

8

0MINIMUM AISLESPACE FORBEEAKER REMOVAL

BOLT

yI * F/rflSH FIOOK

wim' 'Ip "?

-.—/ar/7£FROPJT

>ID

roArALTERNATE METHOD,m\oa

ON

QNJSH.FLOOR ,-BOLT. nSee HORE *»/ / \/ — |3„ „ uj \[

IP^^^ipPfPpsiPP ^sps^TpW'H I 1 1

INDOOR AMCHORIMG METHOD,

f *MAX.

SWITCH QEAR PAD 0A mwvt.o<N LUSTRE EVENAND LEVEL.o MjerBE

EVEN AND )/LEVEL . 1V>

0U'CMMCL* 0

$WITCH qtAfi FLCOS srec- L

HO re */THE ELEVATION Of THE FINISHED Ft OOK

MVSr &f Uv( l WITH OR NOT MORE THAN 3"LOWER THAN THE SWITCHGEAR. PAD ORFLOOR STEEL . NOR SHOULD THE FRO H 7 OfTliE SWITCHGEAR PAD OR FLOOR STEELPROJCCT BBVOND THE FRONT DCVK PANELOF THE POWER VAC EQUIPMENT VMMLEVEL WITH THE FINISHED FLOOR ,

\0 - FINISH FLOOR UNO.rJ§tlpfn1

VIEW -B- TYPICAL FOR CONDUIT LEADS.

Fig. 5 Installation Details for Indoor Power/Vac* Metal-Clad Switchgear (Continued)

STORAGE OF INDOOR EQUIPMENTany apparatus an immediate inspection should be made forany damage sustained while enroute. If damage is evident or anindication of rough handling is visible, a claim for damageshould be filed at once with the transportation company andthe General Electric Company notified promptly. Informationas to damaged parts, part number, case number, requisitionnumber, etc., should accompany the claim.

If it is necessary to store the equipment for any length oftime, the following precautions should be taken to preventbreakage, corrosion, damage or deterioration:

HANDLING1. Uncrate the equipment. Check it thoroughly for damage.2. Cover important parts such as jack screws, gears and

chain of racking mechanism, linkage and movingparts with a heavy oil or grease , such as D6B15 (MobilBefore uncrating, indoor equipment may be moved by

crane with slings under the skids. Spreaders should be used tokeep the cables from rubbing against the equipment. If cranefacilities are unavailable, rollers under the skids may be used.

4 Fig. 5 shows the suggested method of anchoring the switch-ry f gear after it is removed from the skids . After the equipment is

in place the lifting brackets should be removed.

28).

3. Store in a clean, dry place with a moderate temperature(such as 40 - 100°F) and cover with a suitable cover toprevent deposits of dirt or other foreign substances uponmovable parts and electrical contact surfaces.

Methods of handling outdoor equipment are shown in Figs.6, 7 and 8. After the equipment is in place the lifting bracketsshould be removed.

4. Batteries should be uncrated and put on trickle chargeimmediately upon receipt.

IJ

9

5. If dampness or condensation may be encountered in thestorage location, (can occur with rapid temperaturechanges) heaters should be placed inside the equipmentto prevent moisture damage. Approximately 300 wattsof heat per vertical stack will be required. The suggestedarrangement is one 75-watt heat element in each breakerand primary cable compartment. Remove all cartons andother miscellaneous material packed inside units beforeenergizing any heaters. If the equipment has beensubjected to moisture it should be carefully dried outusing forced warm air and then tested with a 1000 or2500 volt megger. A reading of at least 200 megohmsshould be obtained.

2. Cover important parts such as jack screws, gears andchain of racking mechanism, linkage and movingmachine finished parts with a heavy oil or grease suchas D6B15 (Mobil 28).

3. Batteries should be uncrated and put on trickle chargeimmediately upon receipt.

4. Dampness or condensation can be prevented by makinga temporary power supply connection to the heatersalr eady installed in the equipment. If the equipment liasbeen subjected to moisture it should be dried out in thesame manner as with indoor equipment as described. ;

6. Breakers should be prepared for storage separately. Re-fer to the breaker instruction book GEK-39671 fordetails. Caution: Be sure that fuses to CPT secondary have been

removed before energizing the temporary connection tothe heaters. This is to prevent a back feed of high voltageat CPT primary.

STORAGE OF OUTDOOR EQUIPMENT

5. Breakers should be prepared for storage separately.Refer to the breaker instruction book GEK-39671 fordetails.1, Uncrate the equipment. Check it thoroughly for damage.

UFT-SUte.

SPREADERSPREADER.

r:EE I J cr*.ii ZWOOD -BOTH ENDS.

LIFTANGLE;

O' oA

SIDE VIEW .FRONT VIEW.

Fig. 6 Installation Details for Outdoor Power/’Vac* Metal-clad Switchgear

10

0 :

t I

LIFT JACKi

D /-CABLE IOOPUFTitTf> EYEr~

>Nv# LIFTING

ANGLESee FG ! (a Foa PROCEDURE.

•"Oft P Z Z K G> r -i -3 D32S, C'^ 1 ‘ C'4 3L /•a TOPTIONAL METHOD-AIIV

LIFT JACKCABLE

"l.OOR" CROSS LIFTING

iJACKING TIMBER,/ r

^UFT JACK.

' \4 CfiSMEgSj&

LIFTING 'ANGuT^? ! II ? •F

wflt)viy /

• irgr3=C I-Cfl +

rr OPTIONAL METHOD -A A-rf- -3 ' FQl? MOVEMENT^1# mi'5 WRtfTlOfif Or/iY _u5£ RQuFQS,0ckRQLu-SMm.wpmBiJHM^jj i^mBJ?FLOOR CtfAHtfEt*.

LROLLERS-!?USED.a '—TYPICAL JFCKH/G AREA -LIFT JACKING METHOD.

co u)POWER * VAC ZQWPDEVICE PAM L —'

BOLT “ v

/7>y/^ '

(fl ^ ' Fr^u / PeoAS

A /Sif SPACEFOR 6REAR £7?

REMOMl,

ANCHORi M 0CJ POWER VAC EQUIP

FLOOR F«AMfSWf rCMC» £AS PADPAO Q]FPoiJr i. REAP/0 ^ZVASiV tfdOe

pfp7iP*';

* "’- o •'

ANCHORS•.* > ri SWITCHGEAR m

FLOOR $ TEE f.Q <THREADED INSERT IN COtLOWTE,POWER - VACFLOOR FRAMe0 FINISH FLOOR PAD<Tv>Sff HOTS’* )

FINISH FiOOR B mSWITCH <$ EAR PAD 0 Any> ~;

OUTDOOR ANCHORING METHOD.I’wx.r r—fl!ttSrt FLOORUM.m

~TNO TE *1

7PE EiE VAT I ON Of THf FINISHED FLOOR PADMinrae LEVEL WITH THE BOTTOM OF THE POWER-VAC FLOOR PRAMS,SWITCHGEAR PAD OR.FLOOR STEEL .THE FRONT OF THE SWITCHGEARPAD OR FLOOR STEEL MUST ROT PROJECTStIOHD THE FRONT OF THE POWER -VACEQLHPMEN T DEVICE PANEL UNLESS LEVELWITH THE FINISHED FLOOR,

VIEW-JB" TYPICAL FOR CONDUIT LEADS.Mn^Bilipwiij^ ||ffm*WWA»rKII— lUi.WW’k 'BI— « 1 — 1 Mil

Fig. 6 Installation Details for Outdoor Power/Vac* Metal-clad Switchgear (continued)

11

5

-UFT 5um. SmADSR.V:SPREADER.J 11uIfFT Affair i

4 Fil,f i / 0/f

i WITH BUBBLEADDON ,LIFTING STRUCTURS.\

ii

\

\fRUCMsm it o

H - i IT 31T

jMw mu o\tm ASM.-

Off —I:—COMPLEX 8OC^ob

*tHHH

-UFTSUfa SWHEAMR.xzSPREADERX1'

J— v,—^j— • 5y / o

j Ir

t-H•/h5?0

I, POwriteSTwerutt* o

(NO

i t>sb

»* Eii

f4-+

T

*-/-TYR AJ5U ASM.y^ . Al &Lf ASM.—«~A&E ASM,

/M*

':'K

M

Fig. 7 Installation Details for Outdoor Power/Vac* Metal-clad Switchgear with Protected Aisle

12

CHANNEL Et CAP.ROOF CAR *END CAR ^— [) GASKET.-CHANNEL

*END CABCORNER END CAP.

r END CAP. ROOF CAP.*- ROOF PANEL.f no-I*<wr/

^REAR\TRIM SHEET.

UhllT UNEi :iMETAL CLAD EQUIPMENT.HINGED

PANELTBOLTED ONPANEL. ’ -E-DET. VIEW. SHIPPING SPLIT.PROTECTED

Mh.iL. TYR AISLE SECTION SPLIT JOINT JSTAUATION.1 i

BUBBLE.? sIi MeG FR$NT

AlSlE PANEL/vJRi

FRONT* TRIM SHEET.AlSjit FLOOR LINE —7

ii 7 1OPENING COVER. GOBBLEPANFL.E££r M SHEET.w

UiAISLEBUBBLE

k4/

m.GAFltffSH FLOOR.TYR AISLE D-/ vVlTHOUT BUBBLEWITH BUBBLEO SECTION.Vl^f G‘G[ OPTIONAL ASM.i SIDE ELEVATION VIEW OF

PROTECTED AISLE. METAL CLAD ‘

EQUIPMENT WITH 'BUBBLE. A-UIP-BL A

1' INSTALLATION, rAISLE FLOOR-.I* METAL CLAD

^ CGPTFCTENT FLOOR.r°H

o>FINISH FLOOR

-F-LETAILVIEW.G\oCMor-twrH

PH

RQQE-C6R.*CHANNELEND CAP.

END CAR 4.-QIANNEL END CAR *'AISLE ROOF,

O EQUIPMENT ROOF,><D * CHANNEL END CARP4 iT-h -jr05 ra\ is 1/

END CAR /Y ANGIE.# AISLE BOBBLE PRESS TITS.

c-c•MLTAICLADEQUIPMENT.TYR S6AIIN64 ROOF JO)NT DETAIL.

r-GASKET.^~ ROOF CAR*.-—ROOF SECTION.*END CAR/'-CHANNEL END CAP.

PLAN VIEW OF PROTECTED AISLE* METAL CLAD EQUIPSA-AWITH BUBBLE,

ROOF CAP. M AISLE FLOOR LINE.-UNIT LIHESHIPPING SR.IT. SEE: FIG. 17 FOR:

PROCEDURE FOR ADDING TO PROTECTEDAISLE SWITCHGEAR

FLOOR Tie PLATE;-CHANNELEND CAR F/MlSN FLOOR Uhls.-Y~-CORNER >END CAR> AISLE FLOOR -SECTION B~B

TYR FLOOR JOINT DETAI L.

Fig, 7 Installation Details for Outdoor Power/Vac* Metal-clad Switchgear with Protected Aisle(continued)

13

ROOFjCARGABKE T.AAT

-P-B- ROOF Off END SECTION.F !: It a- END CAP. ^I 1 IIt

I *REAR\ TRIM SHEET,*REAR A*

\ .IBM SHEET

® r

A-A- TVRPOOP CAP- COMMON AISLE,

r T"i COMMON METAL CLAP EQUIPMENT.METAL 'CLAD- EQUIPMENT.i i

i i i/FRONT&TRIM SHEET. I

1i iL II ^ TRIM SHEET.t 1 * ROOF CAP- METAL CLAP

EQUIPMENTBUBBLE,- BUS OPENINGEDS*OPENINGam. caCOVER. JA'cDETAIL VIEW-E-AT ROCf CAP,JOINT

JTT

J o^-COMMON AISIE FLOOR. >SIDE ELEVATION VIEW OF

COMMON /VSLLA.KIP,JJTAL CLAD EQUIPMENTSHOWN WITH BUBBLE

FOR PLAN VIEW SEE 5W*g

—f «2r -f /fi/fSH FLOOR.

00

DETAIL VIEW-C

8<NO0000

»rHPH

D :

„ f-*—-1

/zooe 1-nePtATt EQUIR ROOF;ii

ST-DTc— #R0OF CAR.fE. CHANNEL

END CARH ij- -.

~L~z ANGIE!.:HSS5JH£TU-METAL CLAD ECUIPMENt,END CAP #

-METAI HAD EQUIPMENT. AH-H

TVR

PRESS TtTE.dgrip CAP1.JLl- COMMON AISLE

WITH BUBBLE.PJ.M V|£W OF COMMON AISLE.METAL CLAD EQUIPMENT

\M)TH ftlJBBI. E.£FLOOR TIE PLATE.

A T, LCOMMON Al&tEpfflsF,

PAHEL ,

“*«£0* *CHANNEL ENDCAR \v X” ROOF CAP.*-IK

GA-CQMPiTlQM.mi£UBBL£'

COMMON AISLE ROOR UNc.WITHOUT BUBBLE.

VIEW-g-ffPTI^lA^M.CQNPITIQN ASREO'JXEHD CAP T' * y- r“UNIT UNe -sSHlPPlNGSPLIT,ry?

Fft/tSH FLOOR L /tfe,r- - rS- 1*END CAR

COMMON AISLE FLOOR -SECTION Bj)VIEW -F- VIEVJ-F-

TVt> WITH BUBBLE TYP FLOOR JOINT DETAIL.ZtB

Fig. 8 Installation Details for Outdoor Power/Vac* Metal-dad Switdigear with Common Aisle

14

.- GASKET.ROOF CAP.*V y- ROOF PANEL.COQOE\\ PANEL:

A.|L ' "J'' ' W 1©' *> <ss> 1'

.-HINGED PANELriBOUCPBOLTED

PANEL , UNIT LINE SHIPPING,

VIEW-K-TYB Sf/.TION t ROOFJOINT PET.

L y- A!5LE FLOOn|tt))N£.F/tf/SH FLOOR.tfFgh

AN f. BlIBftt F h-«— AISLE SECTIONS AS REQUIRED PER 1

-4- +—INSTALLATION.JzlSEE $HT*i

Fig.8 Installation Details for Outdoor Power/Vac/' Metal-clad Switchgear with Common Aisle (continued)

DESCRIPTION

BREAKER REMOVABLE ELEMENTEach unit is made up of a secondary enclosure and aprimary enclosure as shown in Fig. 9.

The removable element consists of a Power/Vac* circuitbreaker which includes an operating mechanism, interlocks,primary and secondary disconnecting devices. The Power/Vac*breakers are equipped with wheels for easy movement alongthe floor.

SECONDARY ENCLOSURE

The secondary enclosure is located at the front of the unitwhere the breaker is withdrawn. This enclosure consists of acompartment with a hinged panel upon which are mountedthe necessary instruments, control and protective devices. Theterminal blocks, fuse blocks, and some control devices aremounted inside the enclosure on the side sheets and on theinternal device panel. A wiring space is provided across the topof the unit to run wires between vertical sections.

A lift truck (Fig. 10) is provided for insertion and removalof the circuit breaker from the metal-clad unit.

Power/Vac* circuit breakers of the same rating are inter-changeable in their corresponding metal-clad units. An inter-ference interlock is provided on the rear of each circuitbreaker to insure that the properly rated breaker is used within the proper metal-clad unit. (See OPERATION — INTER-FERENCE INTERLOCK).

PRIMARY ENCLOSURE

The primary enclosure contains the high voltage equipmentand connections. It consists of the breaker compartments, thebus compartment, the cable termination compartment, andauxiliary compartments for potential and control powertransformers. Each of these compartments is separated fromthe others by metal barriers for reliability and safety.

For a detailed description of the Power/Vac* breaker andits operation the breaker instruction book GEK 39671 shouldbe consulted.

BREAKER LIFT TRUCK

Interference Interlocks (Fig. 34) are provided on the metal-clad unit to permit only the circuit breaker with the correctvoltage, continuous current , mva and momentary rating to beinserted.

For ease of breaker handling during installation andremoval, a breaker lift truck is furnished as a standard

15

*•» •

1 — Primary Bus2 — Breaker Compartment3 — Load Take-Offs4 — Secondary Compartment

• r ;•

? .;

3

r

Fig. 9 Side Section View Power/Vac* Metal-clad Switchgear

r-— ,v7"‘‘mi

'r>s: * '

:

I' C r .

-

.. ;>':

:

•••' A '1-Uco

j roft/# \r i co>Vi 1 — Lift Truck

2 — Breaker3 — Rails4- Interlock

******* ON00

®cm*< oY—t

' r~*

Pw«

!:• v-*1

2;

!. *?«1 -r <

! !

/ <f> ,j!I \i

\*£•“ St i

K -3i

i * w.rst.\it i i :* -

'' }r>4 > .V T

. , Y

Fig. 10 Power/Vac* Breaker and Lift Truck

16

.{* •V -= .

-Sv-V.v;

^7Y

Fig, 11 Remote Racking Operator

accessory with each Power/Vac* switchgear order (Fig. 10).This accessory device is used to elevate the breaker from thefloor or working platform to the level of the tracks in theswitchgear cubicle. Docking of the lifting device rails to theswitchgear tracks is provided for maximum safety. (See

O OPERATION - BREAKER INSTALLATION).

easily mounted to the breaker unit front door and is designedfor quick transfer between units.

The remote racking operator is furnished in two operatingvoltage versions. The 115 VAC, 50/60 hertz model has a sixfoot electrical cord with standard three prong plug to fit agrounded receptacle or extension cord. The 230 VAC, 50/60hertz model has a three wire six foot cord to which the pur-chaser applies his standard plug.

The remote racking operator is provided with a two posi-tion directional switch, an “On-Off 5 circuit breaker and a pushbutton control box attached with a 30 foot extension cord.

Instructions for the remote racking operator are found inGEK-39683.

s&tit

BREAKER RACKING MECHANISM

When installed in the switchgear cubicle the removableelement is supported by two horizontal steel tracks, one oneach side of the cubicle. The racking mechanism moves thebreaker element along these tracks between the connected andtest positions. This mechanism consists of heavy-duty steeljack screws which carry nuts that engage the sides of theremovable element. The racking mechanism may be manuallyoperated with the racking handle which is furnished with eachequipment.

PRIMARY DISCONNECTS

The 1200 and 2000 ampere primary disconnects consist oftwo rows of silver-plated copper fingers mounted on eitherside of the circuit breaker studs. These fingers are held in placewith a spider which positions the fingers and fastens them tothe breaker. Wipe pressure is obtained by tension springsbetween the rows of fingers which pull them together. Whenthe circuit breaker is connected to the metal-clad studs, thespring force on the fingers is divided between the breaker studand metal-clad studs. See Fig. 12.

I The breaker cannot be moved between the connected and

|test positions unless it has been tripped. The breaker cannot be? closed unless it is in the connected or test position.1

••SS

For a detailed explanation of the racking mechanism referto description under OPERATION - CLOSED DOOR BREAK-ER RACKING.

REMOTE RACKING OPERATOROn 3000 ampere primary disconnects silver-plated copper

fingers are positioned in a circular configuration and aresupported by a noil-magnetic spider. This spider spaces thefingers equally around the breaker stud and fastens them to

The electrically operated racking device (see Fig. 11)provides a convenient means for racking a breaker between theconnected and test positions from a remote location. It is

17

- J (

.-i';ri

*.;= -v ON

(Nv v- \ -1 - 1200 AMP 00

V .-*

ico3ONGOv—'

2-2000 AMP'T

ij

A' ‘l

f.I f"3-3000 AMP

•3

Si-

Fig. 12 Primary Disconnects

18

provided in tills compartment for connecting the purchaser’sprimary cable by means of potheads or clamp-type terminals.Two hole NEMA drilling for two cables per phase is providedat all cable connection points.

the end of the stud. The fingers are held in contact with thebreaker stud by a stainless steel garter spring. A second garterspring on the outer end of the finger provides contact pressurewhen the finger assembly is connected to the tube in themetal-clad unit. See Fig. 12.

In double breaker vertical sections a steel duct serves as apull-box and barrier to separate the two outgoing cablecircuits.BUS COMPARTMENT

The main buses are enclosed in a metal compartment withremovable front covers to provide accessibility. The bus issupported and insulated by molded glass-reinforced-polyesterbarriers which are flame retardant and track resistant. In ISkV equipments polyester supports with porcelain sleeves are

1 provided.

The primary termination space of a unit is accessible byremoval of the bolted rear cover.

POTENTIAL TRANSFORMERS

Potential transformers are located in an auxiliary unit, Upto three transformers can be mounted on a movable carriageequipped with primary and secondary disconnecting devices.When the potential transformers are disconnected, they are ata safe striking distance from all live parts of the switchgear. Inaddition a grounding device is provided which contacts thefuses when the potential transformers are disconnected,effectively discharging the transformers. In this position thetransformer fuses may be safely removed and replaced. Abarrier mounted at the rear of the carriage moves with thecarriage to a position in front of the stationary part of theprimary disconnect device, providing a safe striking distancefrom all live parts. See Fig. 13.

Bus bars are insulated with high dielectric thermosettingepoxy insulation applied using the fluidized bed process. Thisinsulation is suitable for a total temperature of 105°C. Allbolted joints have silver-to-silver connections for low contactresistance. The joints are insulated with a molded polyvinyl-chloride boot.

CURRENT TRANSFORMER COMPARTMENT

The current transformers are mounted over the primarybushings in the rear of the breaker compartment and areisolated from the breaker by the shutter barrier. Currenttransformers are front accessible by removal of the shutterbarrier. The equipment must be deenergized, before anycomponent is touched or serious injury could result.

PRIMARY TERMINATION SPACE

CURRENT LIMITING FUSES AND CONTROL POWERTRANSFORMER

Current limiting fuses with high interrupting rating aresometimes used in metal-clad switchgear to protect smalltransformers or circuits where circuit breakers cannot beeconomically or functionally justified.The primary termination space of each breaker unit is

isolated from the other equipment by metal barriers. Space is

Q<NCO3 ... v-.-. . . . .:'v i ; .* isi ‘

.* '= -i. ...* ;i -s

x* i ; %? V-:-i ->•.\

i-H • v •- •'1* *'.? C-Os !' >:s . >00w- - . - :;v' ^

gjr- ‘ -•= =': ' ?

' s. ' •

?CO V . - :i• -V4

: :Y . •;.; .. . . * 4: i - t. ,v-v< j.oh :

i • .>.. ...:' <« T“t ~:_

:V :•* . . s

•*„ •: :•• •;mms•Vi

f .• >1

iIV •V:

I 1; nt ..\

>;

r:i- o . » ^ •

• 5A r-

•ov >CN : -.:- m i-- .. y.\ .V >'CO mm-..:X1:Os : ! 1

t—I •: . '' V.f - ‘ i:

'> . J -00 " :t iw1 .*! •I : .c •.v. - ntS..- •: •?'.v r- \

~y*• .ob ,< • ?• .

:•

i x .• ‘ .1

•• s .- ’ • *

•

» • ' .: •• 1 •- .:!‘' >'

' -v

• •9 •;• :: - •

.5• Vi : •i- •

'v

Fig. 14 Control Power Transformer Drawout CarriageFig. 13 Potential Transformer Drawout Carriage

19

The fuses are mounted o% a movable carriage equipped withprimary and secondary disconnecting devices. Single phasecontrol power transformers of 15 leva and smaller and theirsecondary breaker are mounted on the carriage with the fuses.See Fig. 14. Larger control power transformers up to 37.5 kvasingle phase or 45 kva 3 phase are located in the cablecompartment behind their associated fuse carriage and theirsecondary breaker is located behind a hinged cover on theupper cable compartment .

available the key interlock can be operated to withdraw thepositive interlock extension. The dummy element now lookslike an open breaker, and it can be racked in or out. As long asthe positive interlock extension is withdrawn, the key iscaptured and it cannot be released unless the dummy elementis in the CONNECTED or TEST position or completely with-drawn. Hence, the sources to which the dummy may con-nect cannot be re-energized until the dummy is in one of thesethree positions.

»

When the fuses are disconnected, they are at a safe strikingdistance from all live parts of the switchgear. In addition agrounding device is provided which contacts the fuses afterthey are disconnected, effectively removing any static chargefrom the fuses. In this position the fuses may be safelyremoved and replaced. The disconnecting devices are capableof interrupting transformer magnetizing current , but shouldnot be used to interrupt load current. Mechanical or keyinterlocks are applied to prevent operating the disconnectingdevice while the load is connected. This is generally ac-complished by interlocking so that the transformer secondarybreaker must be locked in the open position before thedisconnecting device can be connected or disconnected.

The key for the dummy element interlock will usually beobtained from a transfer lock at which all the source keys areaccumulated and captured before the dummy element key canbe obtained.

GROUND AND TEST DEVICE

This device is designed to make either the upper or lowerprimary conductors in the breaker unit readily accessible. Thetype PVV ground and test device, provides a convenientmeans of grounding the cables or the bus in order to safeguardpersonnel who may be working on the cables or theequipment. The device can be used for applying power forhigh potential tests or for fault location. It can be used tomeasure insulation resistance (megger). By using potentialtransformers, it can also be used for phasing out cables. Referto the instruction book provided for this device. If “hot sticks”are used they should be insulated.

Current limiting fuse and control power transformer roll -outs are located in auxiliary units.

DUMMY REMOVABLE ELEMENT

Dummy removable elements, are used as a means ofisolating circuits or bus sections, where operation is infrequentand a circuit breaker cannot be economically justified. Thedevice consists of a circuit breaker mechanism frame andprimary insulator supports with six primary studs includingdisconnecting devices. Copper rods are bolted in the locationnormally occupied by vacuum interrupters. The stationarystructure is the same as for a circuit breaker. When the deviceis fully racked in, it connects the top set of metal-clad primarydisconnects to the bottom set .

CAUTION - NOTE THAT THE MAIN SWITCHGEARBUS IS CONNECTED TO THE LOWER STUDS WHEN THEDEVICE IS INSTALLED IN AN UPPER COMPARTMENTAND TO THE UPPER STUDS WHEN THE DEVICE ISINSTALLED IN A LOWER COMPARTMENT’ Refer to Fig.9, which shows a side section view of the switchgear, forclarification.

In addition to the device described above, there is availablethe deluxe power-operated type PMV' device which has a .

self-contained bus or line selector switch and a separatelycontrolled, power operated, three-phase grounding switch. ThePMV device is a dead-front design with mechanical andelectrical interlocks, provision for remote control and plug-type cable testing and phasing. The primary conductorsrequired for grounding are self-contained, with no externalcable connections required.

An interlock system is provided to insure that the dummyelement cannot be racked in or out , unless all sources to whichit may connect are de-energized. The dummy element includesan extension from the side which is an exact duplicate of thepositive interlock extension on a standard circuit breaker whenthat breaker is closed . Hence, insofar as the racking mechanismis concerned the dummy element locks exactly like a closedcircuit breaker , and the positive interlock prevents it frombeing racked in or out.

The PMV device is designed for maximum safety topersonnel while accomplishing all the basic required groundingand testing functions. Refer to the instruction book providedfor this device.

A key lock is provided on the dummy element. It takes akey which becomes available only when all sources, to whichthe dummy might connect , are de-energized. When the key is

20

INSTALLATION

The switchgear structure can be secured by bolting it tothe floor channels using at least 5/8 inch bolts at locationsshown in Fig, 5. Plug welding can also be used at the samelocations if desired.

Provision should be made in the floor for conduits forprimary and secondary cables, located as shown on the floorplan drawing furnished for the particular requisition. Ifdesired, the conduits may be installed before the switchgear.Consideration should be given to conduits which might berequired for future connections, Conduits must extend nomore than one inch above the finished floor prior to theinstallation of the switchgear. If shipped in more than onesection, shipping sections must be assembled in the propersequence due to the location of conduits, The left hand sec-tion of a switchgear line-up must be positioned in its finallocation first. Then the section located immediately to theright must be positioned as close as the lifting memberspermit with the front in alignment with the first section.Remove the lifting members and then push or jack the unitto the left until it is flush with the first section. Be sure todistribute the forces over the side frame using appropriatetinigers so as not to deform or damage the surface of thestructure.

Before any installation work is done, consult and study alldrawings furnished by the General Electric Company for the

:" particular requisition. These drawings include arrangement and

floor plan drawings, elementary, connection and inter-connection diagrams and a device summary ,

Occasionally additional shipping members are installed inthe primary area to protect against shipping damage,

CAUTION — Shipping braces must be removed prior toenergizing. Shipping braces are painted yellow and may be

dpF&l found in any unit with a red “CautioiT’Tabel attached to the

^|front of the unit. Shipping braces may be applied to devicesas well as to current-carrying conductors.

After the shipping braces have been removed all joints mustbe properly tightened and insulated before energizing the bus.

Mats, screens, railings, etc. which are external to theswitchgear , but which may be required to meet any localcodes, must be furnished by the purchaser.

LOCATION

The recommended aisle space required at the front and atthe rear of the equipment is shown on the floor plan drawingfurnished for the particular requisition. The space at the frontmust be sufficient to permit the insertion and withdrawal ofthe circuit breakers, and their transfer to other units. No partof a foundation “PAD” or “SILL” may extend more than 3inches beyond the front of the equipment.

The space at the rear must be sufficient for installation ofcables, inspection and maintenance.

OUTDOOR EQUIPMENT

Switchgear support should be concrete or reinforcedconcrete with depth, fill, drainage, etc,, according to recom-mended foundation design for the loading, type of con-struction, and local conditions involved. The base furnishedwith the switchgear should be supported on a level surfaceover the full area of the switchgear. Steel supporting membersshould be furnished if required for leveling the foundation andsupporting the switchgear , Refer to Fig, 6 for recommendedfoundation and anchoring.ANCHORING

INDOOR EQUIPMENT- FLOOR PREPARATIONThe station floor must be strong enough to prevent sagging

due to weight of the switchgear structure and to withstand theimpact stress caused by the opening of the circuit breakers\under short circuit conditions. The impact loading is ap-

f proximately 1-1/2 times the static load.Suitable means must be provided by the purchaser for

anchoring the equipment to the floor. It is essential that thefloor be level to avoid distortion of the switchgear structureand the equipment be completely aligned prior to finalanchoring. The recommended floor construction is shown inFig. 5. The floor channels must be level and straight withrespect to each other. Steel shims should be used for finalleveling of the switchgear if necessary. Care should be taken toprovide a smooth, hard, and level floor under and in front of

% the units to facilitate installation and removal of the breaker.If the floor is not level and flush with the floor channels, itwill be difficult to handle the breaker" because it will not belevel with respect to the stationary element.

Primary and secondary conduits should be installed inaccordance with the requisition drawings, before the equip-ment is put into place. Conduits must extend no more thanone inch above the finished floor prior to the installation ofthe switchgear ,

When outdoor equipments are shipped in more than onesection, the roof joint between the sections must be assembledas shown in Fig. 7. Shipping sections must be assembled in theproper sequence due to the location of conduits. The lefthand section of a switchgear line-up must be positioned in itsfinal location first. Then the section located immediately tothe right must be positioned as close as the lifting memberspermit with the front in alignment with the first section.Remove the lifting members and then push or jack the unitto the left until it is flush with the first section. Be sure todistribute the forces over the side frame using appropriatetimbers so as not to, deform or damage the surface of thestructure.

(,

21

OUTDOOR EQUIPMENT WITH PROTECTED AISLE The following procedure outlines the steps necessary toinstall outdoor equipment with a common aisle;

When specified by the purchaser, outdoor equipment isfurnished with an enclosed, weatherproof operating aisle. SeeFig. 3. The aisle enclosure is shipped separately from theswitchgear.

K\(1) Install one of the switchgear lineups in accordancewith the procedure given above for outdoor equip- ^ment.

The following procedure outlines the steps necessary toinstall outdoor equipment with a protected aisle: (2) Remove the shipping covers from the control panels.

Since the relay and instrument cases are not weather-proof, the control panels should be protected frominclement weather until the installation of the aisleenclosure is completed.

(1) Install the switchgear in accordance with the proceduregiven above for outdoor equipment.

(2) Remove the shipping covers from the control panels.Since the relay and instrument cases are not weather-proof , the control panels should be protected frominclement weather until the installation of the aisleenclosure is completed.

(3) Install the aisle floor assembly and bolt into place asshown in Fig. 8.

(4) Move the second switchgear lineup into position andbolt to the aisle floor assembly in the same fashion.After the switchgear is secured to the aisle floor, itshould be anchored to the concrete pad using theanchor clips provided. Install anchor bolts in accord-ance with the requisition drawing,

(3) Install gasketing material and aisle assembly intoposition taking care to align the lap joint between theaisle and switchgear roof assemblies as shown in Fig. 7.Note that aisle sections are provided with liftingmembers which must be removed before joining theaisle to the switchgear. The aisle should be positionedabout 4 inches away from the switchgear, the liftingmembers removed and then the aisle slid into its finalposition. Care should be taken to distribute thepushing forces over the aisle frame with suitabletimber.

(5) Install gasketing material and lower aisle roof assemblyinto place taking care to align the lap joint between theaisle and switchgear roof assemblies. Bolt into place asshown in Fig. 8. jgs?^

(4) Bolt the aisle enclosure in place at the top and on bothends as shown. After bolting the aisle in place, theyellow shipping braces along the open side of the aisleshould be removed.

(6) If the aisle roof assembly was shipped in more thanone section, bolt the sections together in the mannerdescribed above for roof joints in outdoor switchgear.

(7) Install aisle end panels and/or aisle bubble section asshown in the requisition drawings. Install gasketingmaterial as shown in Fig. 8.

(5) If the aisle enclosure was shipped in more than onesection, bolt the sections together and assemble theroof caps in the manner described above for roof jointsin outdoor switchgear..

(8) Connect secondary wiring to lights, convenience out -lets, etc., in accordance with the wiring diagramsfurnished for the equipment.(6) Anchor the base of the protected aisle assembly to the

concrete pad using the anchor clips provided. Installanchor bolts in accordance with the requisition draw-ing, See Fig. 7.

• •’S'"

iSrBREAKER REMOVABLE ELEMENT •gva

(7) Connect secondary wiring to lights, convenience out-lets, etc., in accordance with the wiring diagramsfurnished for the equipment.

Before installing or operating the removable element ,consult the circuit breaker instruction book GEK 39671 fordirections on installation and inspection.

OUTDOOR EQUIPMENT WITH COMMON AISLEThe operation of the racking mechanism, positive and

negative interlocks and associated features are described underOPERATION OF EQUIPMENT and should be reviewed beforeinstalling removable element.

A typical outdoor common aisle equipment is shown in Fig.4. The aisle enclosure sections are shipped separately from theswitchgear.

w

22

<NCO

Ooo00

OX)

Fig. 15 Test Cabinet

When the units are in place and bolted together, assemblethe main bus and other primary connections per the in-structions below.

TEST CABINET

The test cabinet, Fig. 15 is used to operate a breaker thathas been removed from the metal-clad equipment. It shouldbe installed on the wall at a location where maintenance andtesting of the breaker can be conveniently done. Conduitsmust be installed for cables to supply control power for test-ing. Make certain that the green ground conductor is con-nected to the electrical ground.

ADDITION OF UNITS TO EXISTING EQUIPMENT

Before adding units to existing equipment, consult andstudy all drawings furnished with the equipment. In additionto the usual drawings furnished with new equipment specialdrawings may be furnished covering complicated or specialassembly work . Also, check to make sure all necessary partsare on hand.

Secondary wiring and control bus connections should bemade in accordance with the wiring diagrams furnished withthe equipment.

CONNECTIONS

The main bus bars and other connection bars will be eithercopper or aluminum. In either case, the contact surfaces willbe silver surfaced or equivalent. Do not use unplated copper oraluminum bars. All field assembled joints in primary con-ductors, regardless of material or method of insulation, shouldbe made as described below:

BEFORE ANY COVERS ARE REMOVED OR ANYDOORS OPENED WHICH PERMIT ACCESS TO THEPRIMARY CIRCUITS* IT IS ESSENTIAL THAT THE CIR-CUIT OR CIRCUITS BE DE-ENERGIZED AND BREAKERSBE WITHDRAWN TO THE TEST POSITION AND TAGGED.

(1) Wipe silver clean. Do not use steel wool, sandpaper orany abrasive on the silvered surface. Avoid handling ofcleaned surface as much as possible.

(2) After cleaning, apply D50H47 contact compound tothe silvered surfaces in sufficient quantity so that thecontact area will be thoroughly sealed with excesscompound squeezed out of the joint when tightened .The bolts should be tightened to the torque values,shown in Fig. 18. After the bolts have been securelytightened, the joints are insulated using the moldedpolyvinyl-chloride boots which are furnished. Theseboots are placed over the bolted joints and the bootflaps are secured with nylon rivets.

Fig. 16 indicates the special procedures required to add newmetal-clad units to outdoor equipment without a protectedaisle, and Fig. 17 indicates the special procedures required toadd new metal-clad units to outdoor equipment with aprotected aisle. For indoor equipment, it is usually necessaryonly to remove the end trim sheets and to reassemble them onthe new units after these are located and bolted to the existingunits. Otherwise , the installation procedure is the same asdescribed above.

23

PROCEDURE FOR ADDING TO OUTDOOR (NO AISLE)

A. REMOVE THE FOLLOWING ITEMS,MARKED WITH ASTERISK **)FROM THE EXISTING METALCLAD SECTION AND MOVE TO THE ENDOF THE NEW ADDITION.1. CHANNEL END CAPS2. ROOF CAPS3. METALCLAD END AND CORNER CAP4. METALCLAD FRONT TRIM SHEET5. METALCLAD REAR TRIM SHEET6. BUS OPENING COVER

B. TO INSTALL NEW METALCLAD UNITS.1. SET NEW UNITS IN PLACE AND BOLT TOGETHER2. ASSEMBLE BUS OPENING COVER, FRONT AND REAR TRIM SHEETS.3. ASSEMBLE NEW ROOF CAPS AND FRONT AND REAR CHANNEL END CAPS.4. ASSEMBLE GROUND BUS SPLICE BETWEEN EXISTING AND NEW

GROUND BUS.6. ASSEMBLE BUS BARS AND INSULATING BOOTS.6. REASSEMBLE A-t THROUGH A-3

ONv—HO

500CNO -

NOT”“1

w>yr°4(X

Fig. 16 Outdoor Metal-Clad Switchgear Addition of Units to a Line-up (Refer to Fig. 6 and 7)

PROCEDURE FOR ADDING TO PROTECTED / COMMON AISLE O

A. REMOVE THE FOLLOWING ITEMS,MARKED WITH ASTERISK <*->,FROM THEEXISTING PROTECTED/COMMON AISLE AND METALCLAD SECTION AND MOVETO THE END OF THE NEW ADDITION,

1. CHANNELENDCAP2. ROOF CAPS3. METALCLAD END CAP ( S )4. FLOOR TIE PLATE5. AISLE END BUBBLE ENCLOSURE6.METALCLAD FRONT TRIM SHEET

METALCLAD REAR TRIM SHEET8- BUS OPENING COVER

B. TO INSTALL NEW METAL CLAD UNITS -1,SET NEW UNITS IN PLACE a BOLT TOG ETHER -2,ASSEMBLE BUS OPENING COVER, FRONT 8 REAR TRIM SHEETS.3.ASSEMBLE NEW ROOF CAPS 6 REAR CHANNEL END CAP.'4.ASSEMBLE GROUND BUS SPLICE BETWEEN EXISTING 8 NEW

GROUNDBUS.5 ASSEMBLE BUS BARS 8 INSULATING BOOTS.

C. TO INSTALL NEW PROTECTED AISLE UNITSI* APPLY PRESSTITE SEALER TO METALCLAD ROOF.2, INSTALL NEW AISLE ASSEMBLY, BOLT IN PLACE,3* ASSEMBLE NEW ROOF CAP 8 CHANNEL END CAP,

4. ASSEMBLE NEW FLOORIlE PLATE,5 REASSEMBLE ITEMS (A-l) THROUGH

«2oto

ONoO

t-Hbbts

Fig. 17 Outdoor Metal-Clad Switchgear with Protected Common Aisle — Addition of Units to Line-up(Refer to Fig. 7 and 8)

24

(5) Place the PVC bus insulating boots over the joints asshown in Fig. 19 and secure with furnished nylonrivets. Joint insulation is now complete.

TorqueFoot PoundsBolt Size

3/8 - 161/2 - 135/8 - 11

20 - 2530 - 3543 - 47

The material may be aluminum or copper

Fig. 18 Bolt Torque Values for Metal-Clad Switchgear

(3) All field assembled primary joints and terminationsmust be insulated. There are two methods of insulatingjoints* boots where applicable and taped joints for allothers.

.* •

i -. f •• , .• •.l#.-e V •• •-

Mm

- -M . v •/-•‘1* •*’.

:V . ? •'f .. i

• \

vMAIN BUS ASSEMBLY - • !.• .*

: V

.1 V. •>iw ... >.The procedure shown below should be followed when

So assembling the main bus at shipping splits or when adding neweg units to existing equipment.

(1) Unbolt and remove the inter-unit horizontal barriersfrom the vertical sections to be joined. Do not removethe small trays on which the position switch,auxiliaryswitch and ground shoe are mounted. See Fig. 35.

* :i

iaisfco

t.

i.%*$ >' « *-.*:• hj•>' m

- -'11

C\

i iv, vV.:v-- i

; »&pu... .i .

. .." .or

‘ V -s..'. -• - y* 1-1

i =A • . I-(2) Unbolt and remove first the lower and then the upperunit bus cover from the vertical sections to be joined.The bus compartments of the two sections will now beexposed. It is not necessary to remove the secondarycoupler or the racking mechanism chain in order toassemble the bus bars. Fig. 19 Bus Insulating Boot

(3) Install the lower (phase 3) bus bar(s) from theright-hand section. If the main bus uses porcelaininserts, take extreme care not to chip the porcelainwhen installing the bus bars. Position the rubberbushings furnished on the bus bars that assemblethrough the porcelain in the middle of the porcelain.Bolt splice plates and bus bars together, followingassembly instructions as given under CONNECTIONS.The sequence of parts from rear to front is : (1) spliceplate with press nuts, (2) main bus bar (with spacers if2 bar bus) (3) riser bars to breakers or roll outs, Nextinstall the middle phase 2 bus bar(s) in the samefashion.

(6) Replace all barriers and cover plates previously re-moved.

TAPED JOINTS FOR 13.8 KV EQUIPMENT

(1) Prepare all joints as outlined under CONNECTIONS.Clean off any grease on the outside of the joint.>

(2) Fill all cavities around bolts and nuts with A50H119compound to form a smooth surface for taping. Thiscompound is not an insulating medium and should notbe used for that purpose.

(4) From the left-hand section install the upper (phase 1)bus bar(s) as described above.

.• KT*

V

25

* v-Gl^S TAPfc .AMala

isefi- 4"' ENg,— 1/2'-*-KFIS,I

SUSS TAPE . 3/4viBMUM.TAPE- 'H3/ 4

*- i '/ j—£E£-IRRMHEUE

APPROXIMATE AMOUNT Of INSULATION RETIRED TO TAPE ONE LINEAR FOOTS I Z E O P B A RINSULATION

I VOLTFIUTER?TAPE, .25 X2.0 .25X6.0 ,38x &0 .50X 6.0*38 X 6,0BARwiWdl re LENGTH OF TAPE IN FEET

27. 6 V .O28.0¥ 2 27.0>0.0I 600 5000 17 5><: >ao 20.519056.0

6.55T>D $2 sooipspoefJL>c 55.0 61554, 020.03i 1 7 * 5 310teo 1 9 06 . 5

* IRRATHENE ?02TAPE:HIPTH j j£,THJCKNK& *iOJO,LAYERS A5TABULATED WOUND 2/5LAP,ONE LAVER Of IRRATHENE TAPE(WOUND #3LAP,) REQUIRES 3TURNS AROUND THEBARlN ONE WIDTH OF THE TAPE *

THE THICKNESS OF ONE LAVER IS 3TIMES THE THICKNESS OF THE WE.WHEN EARS ARE TAPED ON THE BENCH ASA SUB-ASSEMBLY, THE BOTTOM OF THE 61AS5 TAPE SHOULD STOP AT JLTAB FROM THE END Of THE IRRATHENE 202 TAPE AS SHOWN ABOVE*

b WHITE CLASS TAPE(A2U2B)iWIPTH-lte’x.004 THICK,

( i ) ONE LAYER WOUND1/2 LAP.PAINT AS NOTED ABOVE.,

OJDr*-<

Li,

Fig. 20 Insulation of Connection Bars

*>^2

(3) Wrap with the provided insulating tape 4 layers, 2/3lapped maintaining tension on the tape while wrapping,as shown in Fig. 20. Where there are sharp angles applyadditional layers to obtain equivalent of the simula-tion on tile flat surfaces.

All joints in the bus, including adjustable joints, should be %assembled and insulated as described above for main busesexcept that only yellow joint compound should be used. Thisgrease should also be used at the switchgear riser bars. Ad-justable joints are provided in long runs of bus duct to allowfor variations in building construction, etc. These jointsshould be loosened before installation of the duct , thentightened after being set in the position required by the fixedpoints at the ends of the duct.

(4) Over the insulating tape, apply one layer of glass tape,half lapped as a protective covering as shown in Fig.20.

(5) Over the glass tape, brush a heavy coat of U310(brown) varnish. Varnish may be thinned, if necessary,with Xylene D5B9.

Outdoor bus ducts must be gasketed at the joints betweenshipping sections. Coat both sides of the flat gasket and theflanges of both duct sections with Sterling U310 varnish be-fore assembly. Bolt the two duct sections together. Remove|||the top cover from one duct section and place 3/8 inch elasticcompound bead along top of joint slightly overlapping thesides. Bolt top cover in place and fasten roof cap in place overthe joint. See Fig. 21. When top covers are removed after in-stallation for inspection the 3/8 inch elastic compound beadmust be replaced to insure a tight seal.

TAPED JOINTS FOR 4.16 KV EQUIPMENT

(1) The instructions for the bolted joint and application ofthe tape insulation is the same as outlined for the 13.8kV equipment except use 2 layers 2/3 lapped ofinsulating tape and use the U310 (brown) varnish. Re-fer to Table in Fig. 20.

BUS DUCTRemovable front and rear covers of vertical sections of bus

duct must also be gasketed . Coat both sides of the gasket, theflange of the duct, and the edges of the inside surface of the||§)cover with Sterling U310 varnish before assembly. Do notbolt these covers in place until all interior assembly workon the duct is completed and access will no longer be required.

Bus ducts connecting between groups of metal-clad switch-gear, or between metal-clad switchgear and other apparatus,should be installed as shown on the arrangement drawingsfurnished with the ducts. Supports should be provided asindicated on the drawings.

26

3. Remove cable trough cover and pull-box cover./ 8£AD

'BCAO>4) 4, Remove cable trough(2), Fig. 22.

\! Jm A

Hh-Wf 5. If primary cables enter switchgear from below, terminatecables for lower unit first. If primary cables enter fromabove, terminate cables for upper unit first.

\ 6M8r ! LLV—< //<N \H L j-o

l^r-'CiAbKETCO 6. Replace cable trough.COoh

» t«4

7. Terminate primary cables in remaining unit , (Pullingcables thru cable trough.)Fig. 21 Bus Duct Gaskets

v Outdoor bus ducts of the 13.8 kV cla^s are provided with|heaters, Connect these heaters in accordance with the wiring

|diagrams furnished with the equipment before energizing thebus duct.

ftps 8. Replace pull-box cover, cable trough cover, batten andrear bolted covers.\

Before any primary cable connections are made, the cablesshould be identified to indicate their phase relationship withthe switchgear connections. This is necessary to assure thatmotors will rotate in the proper direction and that the phaserotation is the same when interconnecting two differentsources of power.

PRIMARY CABLES

The primary cable connections are reached by removing therear bolted covers.

When circuit breakers are stacked two high and primarycable terminations must be made in both upper and lowerunits, the procedure described below should be followed.(Refer to Fig. 22.)

There are two common methods of making primary cable,connections:

(a) PotheadsPotheads are used when it is desired to hermeticallyseal the end of the cable to make a moisture-proofconnection between the cable and switchgear bus. Apothead also prevents seeping of oil from the end of oilunpregnated varnish cambric or paper insulated cable.

(b) Clamp type terminals and stress cones.

1. Remove rear bolted coversm2, Remove batten (1), Fig. 22.

No insulation materials are furnished for cable termina-tions. When potheads are supplied as part of switchgear,insulation materials are furnished for the bar terminations tothe pothead studs.

r-Ho%

1 — Batten2-Trough3 — Pull Box

00 \CNO \

\<N\ s

00 t: • •H -« rHULi \ r SI

•xII t,

s Vi-

* If }I rr: u* M

I i T-Hcn-.f- hI •5 00

r-$ Vi

I 2 a s 2S£ ;

'y17

X H COV-•• £

-•iSr2! CNV

U5. V 00'' 314; it [Sw

T- ri 'if '* ii;• .

V

lv^';

Fig. 23 Cable Termination without Pothead, Single ConductorFig. 22 Installation of Primary Cables

27

In all eases carefully follow the cable manufacturer'srecommendations for installation of the type of cable beingused. A typical example of terminating a shielded cable isshown in Fig. 23. If the cable is aluminum, the conductorsurface must be carefully abraided and the cable coveredliberally with a joint compound recommended by the cablemanufacturer.

more space. However,the cable termination space provided inPower/Vac* is never less than the minimum recommended fora hand taped stress cone.

In making up stress cone terminations, ground clamps andground leads are installed , Care must be taken to assure thatthese grounded elements are installed such that the requiredclearances to energized parts are maintained. For insulatedbars or unshielded cables, these areINSULATING PRIMARY CABLE TERMINATIONS

For 5kv equipments — at least 2 inchesFor 15 kV equipments — at least 3 inchesAll field assembled joints for primary cable terminations

should be prepared as outlined under CONNECTIONS. Uponcompletion of the cable, termination, care must be exercisedwhen taping the exposed joint. When terminating three conductor cables which flare out to|

single conductor terminations, the crotch at the root of theflare out should be adequately sealed to prevent possibleentrance of moisture into the three conductor jackets.

ftL Check to see that a sufficient area of insulating tape

extends beyond the fluid bed insulation furnished on theterminal bars (2 inches for 5 kV, 3 inches for 15 kV).Refer to Fig. 20. For long cable runs within the equipment, a support to

restrain lateral movement of the cables under short circuitconditions will be provided approximately 20 inches from thetermination point. The customer’s incoming cables should belashed securely to this support.

2. All terminations should be insulated as outlined in table,Fig. 20, for correct layers of insulating and glass tape.

3. The instructions for application of the tape insulation isthe same as outlined for TAPED JOINTS. There is no provision in the Power-Vac* equipment to

support the weight of primary cables.POTHEADS

GROUND FAULT CURRENT TRANSFORMERS(THROUGH-TYPE)

Installation procedures for a three-conductor lead-sheathedcable with a wiping sleeve cable entrance fitting on thepothead are outlined in Russgreen Cat. No. P66. This is thetype most generally used. The factory does not furnish insulat-ing materials for completing stress cones and cable terminations.In all cases carefully follow the cable manufacturer’s recom-mendation for installation of the type cable being used.

Through-type current transformers (see Fig. 24) arefurnished where specified for sensitive protection againstground faults. These transformers are normally installed in ahorizontal position directly above or below the primary cableterminals so that the primary cable or cables can pass throughthem, One transformer is required for each three-phase circuit.TERMINATION WITHOUT POTHEAD

Where armored cable is used, the armor must be terminatedand grounded before the cable passes through the transformer.Armor clamps are furnished for this purpose when specified.

The factory does not furnish insulating materials forcompleting the termination of primary cables, nor does itfurnish stress cone material, The cable manufacturer’srecommendations should be followed for the type of cablebeing used. When lead or other conducting sheath cable, or cable with

shielding tape or braid is used, it is recommended that thesheath or shield be grounded solidly to the switchgear groundbus, The ground lead should be bonded to the sheath or shieldon the side of the current transformer away from the primaryterminals. In cases where the ground cannot be applied beforethe cable passes through the transformer, bond the lead to thesheath or shield between the transformer and the primaryterminals. The ground conductor must then be passed backalong the cable path through the current transformer beforebeing connected to the ground bus.

When stress cones are required, packaged stress cone kitssuch as the GE Termi-MaticT Cable Termination System arefrequently used . Information and ordering data can be foundin GEA-1017. Since the termination is inside the metal-cladenclosure, the Indoor type A system is generally applicable. Ifexcessive contamination is a problem, the padmount type Gsystem may be desirable. No matter which system is used, stepby step pictorial instructions will be furnished as part of thekit .

Where potheads are used in units provided with ground ^fault current transformers, the pothead mountings must beinsulated from ground.

The space provided for primary cable terminations in thestandard Power -Vac arrangements is more than sufficient forthe Termi-MaticT system. Hand taped stress cones require

28

the circuit breakers are operated. See testing instructions.m

Where units have been split for shipment, any control orother secondary leads which must connect across the split willbe arranged with terminal blocks at the top or on the sidesheet so that the wires can be reconnected. The wires will becut to length and formed before being folded back so that aminimum of time will be required for reconnecting them.

'V

GROUND BUS

Where the equipment is shipped in more than one section,the ground bus must be connected by using the splice platesfurnished with the equipment. Assemble the ground bus jointsas outlined under CONNECTIONS.

* The ground bus is bolted to the rear of the frame near thebottom. It is arranged so that connections to the stationground can be made in any vertical section. Ground bus risersare provided in each cable compartment to provide a con-venient place to ground cable armor, cable sheath, shields orground wires. The switchgear ground bus must be connectedto the station ground bus by a conductor having a current--carrying capacity equal to that of the switchgear ground bus.It is very important that the equipment be properly groundedto protect the operator from injury when short circuits orother abnormal occurrences take place and to ensure that allparts of the equipment, other than live parts, are at groundpotential.

b: I .

i .-.rCN

irO

O00

CN !V,inoh» tH

’ Wife *4& v "

:1- f

V-

‘fi LIGHTNING PROTECTIONj; i’-

ll will be the responsibility of the purchaser to specifysuitable lightning arresters to protect the switchgear fromdamage due to lightning. The General Electric Company’srecommendations as to the types of circuits requiring lightningprotection, and a list of recommended lightning arresters; arecontained in Bulletin GER441, copies of which are availableupon request ,

i :

i I*•

’ * ti.-'

Fig. 24 Rear View of UnitShowing Througli-Type Current Transformers

When lightning arresters are furnished the primary cableterminal will be insulated at the factory unless it must bedisconnected for shipment. When this connection is completedin the field it will be necessary to insulate the primaryconnection before the switchgear is energized.

CONTROL CABLES

When control cables enter the unit from below, the conduitshould not extend more than one inch above the floor. Thecontrol cables may be pulled through the conduits before orafter the switchgear is installed, whichever is more convenient.

Control cables should be guided toward the side sheet andrun behind the track assembly as shown in Fig. 25. This willprevent the circuit breaker or roll-out carriage from inter-fering.

SURGE SUPPRESSORS

General Electric surge suppressors are provided on eachfeeder circuit. These are self contained units which requireno maintenance.

ROOF ENTRANCE BUSHINGConnect the cables to the terminal blocks in accordance

with the wiring diagrams furnished for the requisition. When assembling the connection bar end of roof entrancebushings-inside the switchgear and other terminations whereporcelain insulators are used, insulation should be applied asfollows:

The cables from the control power source to the switchgearshould be large enough to avoid excessive voltage drop when 29

0COvps

ROLLOUT El BOTTOMAPARTMENT,

Fig. 25 Control Cable Guide

(1) Prepare the connection bars as outlined under CON-NECTIONS.

(2) Fill all cavities around the contact nuts and connectionbars with A50H119 compound. Form a smoothsurface for taping. The compound is not an insulatingmedium and should not be used for that purpose.

00T-H

<NooL, CN(3) Wrap joint with insulating tape provided, maintainingtension on the tape while wrapping as shown in Fig.20. Where there are sharp angles apply additionallayers to obtain equivalent of the insulation on the flatsurfaces.

o’w'VO(N

39UH

(4) Over the insulating tape, apply one layer of glass tape,half LAP as a protective covering as shown in Fig. 20.

:*Tivw FiMlt>•vV T&%V

(5) Over the glass tape, brush a heavy coat of U310 brown(for 15kV) or U311 black (for 5kV) varnish. See Fig. EXE*

i~nr*26.

Si>.

Fig. 26 Taping of Roof Entrance Termination

30

1 -Position Indicator2 - Racking Shaft3- Rail4 -Shaft Bearing5- Racking Nut6 — Jack Screw7 - Interlock

I

Fig. 27 Racking Mechanism

CN'—iCOs 2.00

1 - Lift Truck2 - Truck Locking Handle3 — Wheel Locking Handle4 D o c k i n g Hooks

oo<N 3 -

4HJ PUU P ORASP to? OR BOTTOM WllltKsitU:

T;- -£;:t?

ML—i

Fig. 28 Lift Truck. Connection to Rails

31

TESTING AND INSPECTION

drop. The voltage at the terminals of the breaker closing coils,when the breaker is being closed , should not be less than 112.5volts for 125-volt coils and 225 volts for 250-volt coils.

After the equipment has been installed and all connectionsmade, it should be tested and inspected before putting it inservice. Although the equipment and devices have beencompletely tested at the factory, a final field test should bemade to be sure that the equipment has been properlyinstalled and that all connections are correct and have notbecome loose in transportation. The primary equipmentshould be completely de-energized while the tests are inprogress.

Directions for testing devices such as relays, instrumentsand meters are given in the instruction book furnished for eachdevice. The settings of the protective relays must be coordin-ated with the other relays on the system and therefore theserelays must be set by the purchaser. General instructions onsetting the relays are given in the relay instruction books.Special instruction books are furnished for complicatedautomatic equipments, describing the sequence of operation ofthe devices required to perform the desired function.

The operation of the breaker with its associated devicesmay be tested in the unit while the equipment is energized byracking the breaker into the test position and engaging thesecondary coupler. This is accomplished by lowering thehandle on the right-hand side of the breaker mechanism andpushing forward until the coupler engages.

High potential tests to check the integrity of the insulationare not necessary if the insulation instructions in this book are £ )fcarefully followed. Should the purchaser desire to make highpotential tests, the test voltage should not exceed 14 kValternating current for 4.16 kV and 27 kV alternating currentfor 13,8 equipments. These voltages are 75 percent of factorytest voltages and are in accordance with ANSI standards.

When transformers are furnished to supply the controlpower, the primary taps should be selected so that the controlvoltage indicated on the wiring diagram is obtained on thesecondary of the transformer. When a battery is used to supplythe control power, the cables from the battery to theswitchgear should be large enough to avoid excessive voltage

Potential transformers, control power transformers, light-ning arresters, and surge suppressors must be disconnectedduring high voltage testing. When bus ground studs and capsare furnished, the caps are removed in order to attach ground-ing cables. The purchaser must replace the ground stud capsafter testing and/or maintenance is complete.

OPERATION

The metal-clad switchgear provides safe operation and easyremoval and replacement of the circuit breaker. Circuitbreakers of the same type, rating and duplicate wiring may beinterchanged. Various interlocks are provided between themetal-clad and breaker to insure safe operation. The followinginstructions explain how these interlocks should function. Ifthe breaker and metal-clad do not function in the mannercalled for in these instructions, do not force, modify, adjustor remove any interlocks. Consult your local General ElectricInstallation and Service representative. Failure to follow thefollowing instructions could result in serious injury .BREAKER INSTALLATION AND REMOVAL

With ail primary and control power circuits deenergized andbefore installing the breaker clean the mating surfaces of themetal-clad and circuit breaker primary disconnects, secondarydisconnects and ground shoe and apply a thin coating ofD50H47 contact grease. This will prevent galling of thesilvered-contact surfaces.

Check the racking mechanism to make certain that it is inthe disconnect position , see Fig. 27. The tape indicator shouldread “Disc/Test” and the drive nuts on the jack screws shouldbe in the forward position against their respective stops. Theracking mechanism is accurately leveled and checked at thefactory and should need no adjustment.

Check the circuit breaker to ensure that it is in the “OPEN”and “DISCHARGED” condition .

Pick up the breaker with the lift truck by moving them insuch a position that the channel type rails on the lift truckslide over the wheels on the side of the breaker .

Lock the breaker on the truck by pulling the wheel lockinghandles (3) Fig. 28 out to the side and secure the wheel lockby pulling the truck locking handles (2) Fig. 28 forward untilthe wheel locking handle engages a notch. Operate bothhandles first on one side and then on the other.

Operate the lift truck crank to raise the breaker until thetruck rails are slightly higher than the rails in the metal-cladunit into which the breaker is to be inserted. Move the lifttruck toward the metal-clad unit and lower the lift truckslightly , if necessary, to engage the docking hooks and check S, J®ythat the lift truck rails are approximately level.

Move the truck locking handles (2) forward. This actionreleases the breaker wheel locking handles (3) and locks thelift truck and metal-clad rails together.

Push the breaker into the metal-clad unit until the rackingarms are engaged as indicated by the label on the front coverof the breaker. (1) Fig. 29. A safety catch on the right handmetal-clad rail will prevent the breaker from rolling back outin case the racking arms are not engaged , see Fig. 44.

The lift truck may now be released by moving the breakerwheel lock handle (3) out and the truck locking handle for-ward .

m

32

1 ' DO NOT MAKE ANY ADJUSTMENT. COMMUNICATEWITH THE NEAREST GENERAL ELECTRIC COMPANY IN-STALLATION AND SERVICE ENGINEERING OFFICE FORINSTRUCTIONS.

BREAKER RACKING WITH FRONT DOOR CLOSED

The circuit breaker can be racked in and out of the“Connect” position with the front door of the metal-cladclosed. For maximum safety the breaker must always beracked with the front door closed when primary power isconnected to the metal-clad. Make sure the breaker is openbefore attempting to rack the breaker. The breaker is installedin the metal-clad unit as described in BREAKER INSTALLA-TION. Engage the racking arms and then close the front doorof the unit and secure it with the knurled knobs. Insert theracking handle into the hole in the left side of the front doorand engage the racking mechanism by pushing it in fully. Rackthe breaker by rotating the handle clock wide (60 turns arerequired) until a positive stop is felt . The breaker is now in thefully connected position and the tape indicator should read“Conn”.

To rack the circuit breaker from the “Connected” to the“Disconnect /Test” position be sure that the breaker is openthen turn the handle counterclockwise.

.7 = .i .• • •y

; • •.V.'

%P ;

; j -•?;>v: <...£ V:'

c .•

00 ;••

ro *«r--:vj-00o\oo

9 nwi»ic;,>: •C\Cl

00 \“r-1

%y mm" ‘" sfc&SSJy •

• <1 .

• < > ' • i2 " 0

r>Cv

5 - Charge Indicator6 -Manual Charge7 — Nameplate8 — Manual Close9 - Breaker Racking Lever

1 — Indicator2 — Push to Trip Open3 - Open-Close Indicator4 — Counter REMOTE RACKING ATTACHMENT

The breaker may be racked between the “Disconnect/Test”and “Connected” positions electrically using the remoteracking device. See DESCRIPTION - REMOTE RACKINGATTACHMENT.

Fig. 29 Racking Ann Position Indicator Level

To remove the breaker from the metal-clad unit reverse thef above procedure , Check the circuit breaker to be sure that it is

in the “open” position. Rack the breaker from the “Connect”position to “Disconnect /Test” , Disengage the rackingmechanism by raising both racking arms and roll the breakerforward . Move the lift truck into position to engage the railsand connect the docking hooks. After disengaging the safetycatch on the right hand rail the breaker can now be rolledforward onto the lift truck for transporting away.

After the breaker has been racked fully into the connectedposition and then is removed from the unit , the engagementand alignment of the primary disconnect fingers on the breakerstuds may be checked with respect to the stationary conductorin the unit. (THE SWITCHGEAR MUST BE DEENERGIZEDFOR THIS CHECK.)

Use the racking handle to turn the jackscrew several turnstoward the connected position, until the shutters are opened touncover the opening to the insulation tube and stationary con -ductor in the unit. Inspect the impression made in the coatingof contact lubricant D50H47 on the stationary conductor sur-face by the breaker primary disconnect fingers:

On 1200 and 2000 ampere ratings, there must be heavy im-pressions of all the fingers on both the top and bottom of thestationary conductor bar. The impressions should extend backfrom the front end of the bar a minimum of 1/2 inch and shouldbe no closer than 3/16 inch to either side of the bar.

On 3000 ampere ratings, there must be heavy impressions ofall the fingers on the cylindrical conductor. The impressionsshould extend back from the front end a minimum of 1 /2 inch.

POSITIVE INTERLOCKThe positive interlock functions to prevent racking a

breaker between the “Connect” and the “Disconnect/Test”positions except when the primary contacts are open.

The positive interlock consists of a bar which protrudesfrom the left side of a closed breaker to engage a slot in thelcft-side-racking mechanism when the breaker is in either the“Disconnect/Test” or “Connected” position. When the inter-lock is engaged the racking mechanism cannot be operated.(See Fig. 30.)

To test the function of the positive interlock install acircuit breaker following the instructions given under BREAK-ER INSTALLATION. For the test the control power circuitsin the metal-clad must be energized.

Place the breaker in the “Disconnect /Test” position andconnect the secondary disconnect device by pulling down onthe breaker handle and horizontally inserting the lever armfully into the breaker to engage the secondary disconnects.This will actuate the spring-charging motor and charge thebreaker-closing springs. Close the front door of the unit and

it with the knurled knobs. BEFORE PROCEEDINGsecureWITH THIS CHECK IT IS NECESSARY THAT THE PRI-MARY CIRCUITS BE DE-ENERGIZED. Close the breakerwith the control switch on the front of the door then insertthe racking handle into the hole in the unit door. Whenattempting to insert the racking handle a definite stop shouldbe encountered preventing the socket on the racking handlefrom engaging the racking mechanism.

§If the contact wipe is not proper , adjustments will be neces-

sary.33

©1 -• Interlock2- Racking Shaft3- Rail4 - Slot

oooco00

o\00

oco

Fig. 30 Positive Interlock

the breaker-closing springs. Close the breaker using either thecontrol switch or the manual close button. Push the slidinglink located on the front of the left track rearward . Refer toFig. 32. This will cause the negative interlock roller on thebreaker to depress and trip the breaker. Leave the sliding linkin the rearward position and attempt to close the breaker usingthe control switch. Nothing should happen, Now attempt toclose the breaker by depressing the manual close button. Theclosing springs will discharge but the breaker should remainopen. Return the sliding link to the forward position ,

Trip the breaker and rack it into the connected position .AGAIN IT IS EMPHASIZED THAT THE PRIMARY CIR-CUITS MUST BE DE-ENERGIZED BEFORE MAKING THISCHECK OF THE POSITIVE INTERLOCK. Close the breakerand insert the racking handle into the hole in the unit door .When attempting to insert the racking handle a definite stopshould be encountered preventing the socket on the rackinghandle from engaging the racking mechanism.

If the interlock does not function as indicated in either ofthe above cases DO NOT MAKE ANY ADJUSTMENT.COMMUNICATE WITH THE NEAREST GENERAL ELEC-TRIC COMPANY INSTALLATION AND SERVICE ENGI-NEERING OFFICE FOR INSTRUCTIONS.

Rack the circuit breaker into the connected position andclose it either manually or electrically. Push the sliding linkrearward and verify that the breaker trips. With the sliding linkin the rearward position attempt to close the breaker using thecontrol switch, Again, nothing should happen. Now attempt toclose the breaker by depressing the manual close button.Again, the closing springs will discharge but the breaker shouldremain open.

NEGATIVE INTERLOCK

The negative interlock functions to hold the breaker in amechanical and electrical trip-free mode when it is beingracked between the “Disconnect /Test'’ and ‘'Connect” posi-tions. As an added precaution the negative interlock will tripthe breaker and hold it trip-free if an attempt is made tooperate the racking mechanism when the breaker is closed andin either the “Disconnect/Test” or “Connect” position, andthe positive interlock fails to function.

The negative interlock consists of two notched members inthe left-side-track assembly which operate the negative (triplatch) interlock roller on the left side of the breaker. Refer toFig. 31. On the metal-clad one members is stationary and theother is a spring-loaded slide attached to the racking mecha-nism. A third member, a notched sliding link, provides the keylock functions and is described under KEY LOCKS. See Fig,

If the interlock does not function as indicated in either ofthe above cases DO NOT MAKE ANY ADJUSTMENT.COMMUNICATE WITH THE NEAREST GENERALELECTRIC COMPANY INSTALLATION AND SERVICEE N G I N E E R I N G O F F I C E F O R ADDITIONAL BSF, ,STRUCTIONS. f j

SPRING DISCHARGE INTERLOCK

The spring discharge interlock consists of a notchedmember in the right-side-track assembly which activates thespring discharge roller on the right side of the breaker . Referto Fig. 33.

The function of the spring discharge interlock is to preventthe breaker closing spring from being charged unless thebreaker is in the “Connect” or “Disconnect/Test” position orremoved from the cubicle. In addition, it will mechanical!discharge the breaker springs when the breaker is movebetween any of the above mentioned positions and preventrecharging by opening the close-latch-monitoring switch in thebreaker spring-charging circuit ,

32.To test the function of the negative interlock install a

circuit breaker following the instructions given underBREAKER INSTALLATION. For this test the control powercircuits in the metal-clad must be energized .

Place the breaker in the “Disconnect /Test” position andconnect the secondary disconnect device by pulling down onthe breaker handle and inserting the level arm fully into thebreaker. This will actuate the spring-charging motor and charge

34

• r IT*•V*

'

tte-1 ti ii . - j.. i. I ;i: •

•

H - !

• > : -r- .. . ..?••• r - - ..- :’i -: u 1 ri- • •

•/L: . 5 .> •

i;

§: * •?%'If! . •

f . ? •i: r 1 — Position Indicator2 — Racking Shaft3 — Rail4 - Bearing5 - Racking Nut6 — Forward Slot7-Cam8- Rear Slot

: " i '•*s 1v 5I •• • *• MMi fm •.t•: 1

I - - t•! • *: :v> *V •• > .

'v FiS' V *> : safer,ij2^ ’ <

. . r • - i-m- .\

liftfiV:.V*8- tPH *J UUgIV '

CO y iKt 4-V

\00 nib* ’-J"r-i'-'V; • *-•: •-« •T*H

, .| ....

5I ** ‘. .Li . :S-l*

•i -ON r' r .!0 0 mt !i ^:;• . .

: ^A*s -gvw ••j ?. i • - ^ ^1 f ) ' iOfr:

* • V. f ... ...... .614 <*s f

• :. * • •!•ViI ICOt0G§

I

Fig. 31 Negative Interlock&uig.?;:>v -•: • I -r

:-|•••-i»

BSilliSttij ••,

04 i

00£ •

?• "k V -

N- : "CO r^j- -«.- r .

rr^%Voo• ,vJv-H

• i-ON FvS*1. '.-i00 t- v

1- Notched Sliding Link2 — Detent3 — Keylock4 — Bolt5 -Slot

- 1T5?^. • >:.. . • v -|:'• W -i f

• =' V -, •.. |.

mw Jk>n wmmmro :•X's;i Voh L- is*-?* }ljgg5«^ >

" • ; i - ,1.'

' * }• ‘ * •*: I-

.E jssesa • i.R|HcF :. -5

' V .>/>,..AS r -,;v.iiiL

V • A

... I w4t-c.; y-

' :s' ';'.

S3. Vi •

' •Vi — * u! • vv ' ,

•' .v :>.. T ' •tflY

' ••••: -

f ?• .-. .i>- •*> .? - •:• >• •••;^

Y ‘. - '-.gU .= ••' ’ , .....

i? £$$}&**:-. 1's- • ••*r- •

immz?:

Fig , 32 Key Lock and Padlocks

device as before and this will cause the spring charging motorto charge the breaker closing springs . Raise the racking armsto the release position and roll the breaker forward. The springdischarge interlock should discharge the breaker closing springsbefore traveling 1/2 inch .

If the interlock does not function as indicated DO NOTMAKE ANY ADJUSTMENT , COMMUNICATE WITH THENEAREST GENERAL ELECTRIC COMPANY INSTALLA-TION AND SERVICE ENGINEERING OFFICE FOR IN-STRUCTIONS’

To test the function of the spring-discharge interlock installa circuit breaker following the instructions given underBREAKER INSTALLATION. For this test the control powercircuits in the metal-clad must be energized.

Place the breaker in the “Disconnect /Test” position and% connect the secondary disconnect device by pulling down on

the breaker handle and inserting the level arm fully in thebreaker. This will actuate the spring-charging motor and chargethe breaker-closing springs.

Rack the breaker toward the connected position using themanual racking handle. The spring-discharge interlock shoulddischarge the breaker springs in three to five turns.

Continue to rack the breaker to the connected position.Just before reaching the connected position > the springcharging motor will be reenergized and charge the closingsprings. Rack the breaker toward the disconnected position .The spring discharge interlock should discharge the breakerclosing springs in 3 to 5 turns. Continue to rack the breaker tothe disconnect position. Reenergize the secondary disconnect

i f f ;"3*: •

INTERFERENCE INTERLOCKThe function of the mechanical interference interlock is to

permit only breakers with the same ratings to be inserted inany specific compartment.

This interlock consists of two comb-like plates, one on theequipment and a mating plate on the breaker. The equipmentinterference plate is permanently fastened to a cross memberlocated just below the breaker mechanism frame device panel.(See Fig. 34.)

35

Hgsu-.,S&YYVY^ .

' YY.< .,'

i*x

rrzrr- r^.V^Vi- v ‘ . "s' ' ; 1 - Racking Nut

2 - Bearing3 — Jack Screw4 - Rail5 - Disconnect/Test Slot6 — Operating CAM7 ~ Connect Slot

* YU* -A.—Tj., i •v O

00<23I * : i •> •tr-H0\oocoCOob•T-i[ll

Fig. 33 Closing Spring Discharge Interlock

TO PREVENT DAMAGE DO NOT REMOVE REPLACEOR READJUST THE RATING INTERFERENCE PLATESON EITHER THE METAL-CLAD UNIT OR THE POWERVAC* CIRCUIT BREAKER. IN CASE OF A PROBLEMCONSULT YOUR NEAREST GENERAL ELECTRIC COM-PANY INSTALLATION AND SERVICE ENGINEERINGOFFICE.

r-oCO

3GO

V-l

yiCO

CLOSING SPRING GAG INTERLOCK V;tt l . j> - ... - _. - - Y &

An interlock is provided at the rear left side of the breakerto prevent racking in a breaker which has the spring blockingpin in the gagged position. The spring blocking pin must beremoved from the gag position and repositioned to hold thisinterlock in the ungagged position before the breaker willenter the metal-clad unit . See breaker instruction book GEK39671 for the use of the closing spring blocking pin.

v -<? t* r * * ««* * K1 f

Fig. 34 Interference Interlock

the keylock and does not block the motion of the rackingmechanism,

CAUTION : Gagging closing springs when they are in the dis-charged position can damage the breaker. The breaker sideframe may be deformed and/or the gear motor may be dam-aged.

The second position for padlocks (5) is behind the keylock. A padlock in this slot will prevent any motion of theracking mechanism by keeping the hexagon turning shaftcovered ,KEY LOCK

On the lefthand breaker racking mechanism track is aprovision for a key lock. The purpose of this lock is to keepthe breaker from closing in the ‘'Test” and “Connect”positions by operating the negative interlock see Fig. 32. Tooperate the key lock (3) in order to remove the key , push slide(1 ) to the rear and extend the bolt (4) of the lock into slot .This allows the key to be removed and prevents the breakerfrom closing, The key lock does not prevent motion of theracking mechanism.

STATIONARY AUXILIARY SWITCH

An auxiliary switch can be provided at the bottom of the X .fbreaker compartment so that additional contacts can beactuated by the operation of the breaker. The breaker willoperate this switch when it is in the “Test” or “Connect”position. See Fig. 35.

BREAKER POSITION SWITCH

A position switch can be provided at the bottom of abreaker compartment so that it will be operated by a bracketon the breaker frame when the breaker is in the “Connect”position. When the breaker is withdrawn, a spring will return

the switch to its normal position . See Fig. 35.SPACE HEATERS

Space heaters are provided in all outdoor equipment in

PADLOCKS

Two positions for a possible 3 padlocks each are providedon the racking mechanism. See Fig. 32. The front positionkeeps the breaker from closing in the “Test” and “Connect”position . To obtain this position push slide (1) Fig. 32 to therear and insert the padlock in the slotted opening just forwardof the keylock (3), This gives the same interlocking function as

36

order to keep the inside temperature several degrees higherthan the outside. Heaters are also furnished for indoorequipment with it is brown that abnormal atmosphericconditions exist at the installation, or when- specified by thepurchaser.©

By maintaining a slight temperature differential, the heatershelp facilitate drying and prevent condensation and theresulting corrosion and insulation deterioration which mightoccur.

Four 75-watt heaters are provided in each vertical section.One heater is located in each breaker or auxiliary compart-ment on the bottom at the rear. One heater is also located atthe bottom of each cable compartment when breakers arestacked two high. When there is only one breaker per sectionboth heaters are located in the cable compartment at thebottom of the section. Heaters may also be located intransition compartments and in bus ducts if the operatingconditions require them.

rawi

5?00CO

00 Before energizing the heaters, be sure the power source is ofthe proper voltage, frequency, and phase arrangement, and isconnected in accordance with the wiring diagrams furnishedwith the equipment. Also, be sure to remove all cartons andmiscellaneous material packed inside the units before energiz-ing the heaters.

0\00

I /Orooh

£S

1 - Secondary Coupler2 ~ Position Switch Actuator3 — Position Switch4 — Ground Shoe5 -- Stationary Auxiliary Switch Connect

Position Actuator6 — Stationary Auxiliary Switch7 — Stationary Auxiliary Switch Test

Position Actuator

© The heater circuit should be inspected several times a yearto make sure that it is energized.

It is recommended that the heaters be energized at all timesand that thermostatic control not be used. If thermostaticcontrol is used, the contacts of the thermostat should be set toclose between 95°F and 100°F on falling temperature,de-energizing the heaters only when strong sunlight beats onthe switchgear. Under no condition should a differentialthermostat be used to control the heaters because underconditions of extremely high humidity this type of thermostatwill not operate at all times to keep the heaters on enough toprevent condensation in the switchgear.

Fig. 35Stationary Auxiliary Switch and Breaker Position Switch

MAINTENANCE

conditions. In any event, it will be a valuable reference forsubsequent maintenance work and for station operation. It isrecommended that the record include reports of tests made,the condition of equipment and repairs and adjustments thatwere made.

A regular maintenance schedule should be established toobtain the best service and reliability from the switchgear.Plant operating and local conditions will dictate the frequencyof inspection required. For specific information regarding themaintenance of devices, such as circuit breakers, relays,meters, etc., refer to the separate instruction book furnishedfor each device. The test cabinet , which is furnished, providesa convenient means for maintaining the circuit breakers. Undernormal conditions the protective relays do not operate,

BEFORE ANY COVERS ARE REMOVED OR ANYDOORS OPENED WHICH PERMIT ACCESS TO THEPRIMARY CIRCUITS, IT IS ESSENTIAL THAT THECIRCUIT OR CIRCUITS BE DE-ENERGIZED AND BREAK-ERS BE WITHDRAWN TO THE TEST POSITION ANDTAGGED.

therefore, it is important to check the operation of thesedevices regularly.

A permanent record of all maintenance work should bekept, the degree of detail depending on the operating The primary circuits of metal-clad switchgear are insulated

37

pheric conditions cause deposits such as sulphides on thecontacts. If necessary the deposits can be removed witha good grade of silver polish.

in order to reduce the size of the equipment. However, this

insulation, except in one or two instances, requires a certain

amount of air gap between phases and to ground to complete

the insulation. Inserting any object in this air space, whenequipment is energized, whether it be a tool or a part of thebody, may under certain conditions, in effect, short circuitthis air gap and may cause a breakdown in the primary circuit

to ground and cause serious damage or injury or both.

Sandpaper, steel wool or abrasive cleaners should never ^be used on silver-plated parts.

Before replacing breaker, apply a thin coat of contactlubricant D50H47 to breaker studs for lubrication.

Care should be exercised in the maintenance and checking

procedures that accidental tripping or operation is notinitiated.

5. Check to see that all anchor bolts and bolts in thestructure are tight. Check tightness and continuity of allcontrol connections and wiring.

k i T

6. If the switchgear is equipped with heaters, check to se#that all heaters are energized and operating. *

or*RECOMMENDED ANNUAL MAINTENANCE

;The switchgear structure and connections should be given

the following overall maintenance at least annually. Allmaintenance work must be done with both the primary and

control power circuits deenergized.Inspect individual heater elements and replace any whichhave failed.

7. All louvered exterior openings in outdoor equipment arefurnished with air filter’s. The foam filter elementsshould be removed and washed in warm soapy water,rinsed and reassembled at least annually. Elementsshould be inspected before reassembly and replaced ifany signs of deterioration are evident.

1. Thoroughly clean the equipment, preferably using aheavy duty vacuum cleaner to remove all dust and otheraccumulations. Wipe clean the buses and supports.Inspect the buses and connections carefully for evidenceof overheating or weakening of the insulation.

2. Measure the resistance to ground and between phases ofthe insulation of buses and connections with a 1000 or2500 volt megger. Since definite limits cannot be givenfor satisfactory insulation resistance values, a recordmust be kept of the reading. Weakening of the insulationfrom one maintenance period to the next can berecognized from the recorded readings. The readingsshould be taken under similar conditions each time ifpossible, and the record should include the temperatureand humidity.

OUTDOOR ACRYLIC PAINT FINISH 5»

The outside of outdoor switchgear has acrylic paint finishproviding improved resistance to all atmospheric conditions,longer life and less maintenance than with ordinary paintfinishes.

If it is desired to refinish acrylic painted switchgear, it isnecessary to use one of the following procedures in order tosecure the best adhesion of the paint to the original finish.

High potential tests are not required, but if it seemsadvisable, based on the insulation resistance tests or afterrepairs, the test voltage should not exceed 14 kValternating current for 4.16 kV and 27 kV alternatingcurrent for 13.8 equipments. These voltages are 75percent of factory test voltages and are in accordancewith ANSI standards.

A. Refinishing with Acrylic Paint. It is recommended thatrefinishing be done with DuPont acrylic paint of the desiredcolor. Obtain materials and instructions for applicationfrom the DuPont Company. w

B. Refinishing with Alkyd or Oil Base Paints. Two methoare recommended:Potential transformers and control power transformers,

lighting, arrestors and surge suppressors must be dis-connected during high voltage testing. 1, Spray one sealer coat of DuPont 233E75300 or equiva-

lent which has been reduced to spraying viscosity withDuPont 37692 or 37666 thinner. Air dry for one hour.Apply alkyd or oil base paint.3. Clean racking mechanism and lubricate jack screws and

gears with lubricant D6B15 (Mobil 28),

2. Spray one sealer coat of Arco 214-806 primer which hasbeen reduced to spraying viscosity with Xylol. Air dryfor one hour. Apply alkyd or oil base paint,

4. Check primary disconnecting device contacts for signs ofabnormal wear or overheating. Discoloration of thesilvered surfaces is not ordinarily harmful unless atmos-

38

RENEWAL PARTS

ORDERING INSTRUCTIONSFor prices, refer to the nearest office of the General

Electric Company,Renewal parts should be ordered from the SwitchgearBusiness Department.

If insulating material, such as tape, varnish, compound, etc.,is required, it must be specified separately.Always specify the requisition number on which the

equipment was originally furnished.If parts listed separately are to be assembled at the factory,

order must so state.Specify the quantity, reference number, description andthis bulletin number.

Not all parts shown herein will be used on any oneequipment. Parts not used in original equipment should not beordered as renewal parts.Standard hardware, such as screws, bolts, nuts, washers

I is not listed. Such items should be purchased locally. >

ti

m

VOON<N3oo

VOCT )

0-0

Fig. 36 Right Hand Track Assembly for Vacuum Metal Clad

vv

39

%

Fig. 37 Left Hand Track Assembly for Vacuum Metal Clad

- s ;ss ;:;.r.^

^

i A •*- •- •: ..v ..V’v' -V -v -'r. >- -V' N''•:’•v> ,1»;c'*v4;• H u r*/*'’

v - Vv ~; '’i•“•i-ti- •>V':••;• •V-

«?f!SSiiSKgaS!CSlag . "5rl «»;

?''V;''V*>V;"'

JSS-:

^jails’

*&*»fi

*f‘: -c - 1*. ’-

•^ '• -'V-:.- :wi I.*.-; .:..>. -v ••^ ~ ^ -—‘ .Z ..* v» - * ‘ :'/• •* . ' • .;

r.m —-in? ""•s»g >'* • • ¥>"

; .,, 5-:: A-. ri - - *::»$. ...

•. -• '• ?..VV:

y-t

ir- *• •"

-y.*:

s'. *tr ,v- .',• • •- f;: 1

:S : y.‘ ;;•'i ••’ ‘ ' . •=-: .-4

: - s x - t : % 1 . 'S>•;

P^:; -

;.. .• • ••• V V •/

^ ' •v•.. ‘.sv>

':•

l•:

•:V

-. . '• :;• 1- s t ..'•=• . •

f . ••• •

*'&•• -‘-is-feV;?:

"*

:*'' .**"* :r :•

•. •'• ••_• •• .-• v V:- * • • •

• •:•a : •'• •

— i - -- • •• •.<:. •-'V; ^ •

Fig. 38 Spreader Bar, Chain and Idler Sprocket for Vacuum Metal Clad

do

'44

K>

co /

ONCN300

C\co

Fig. 39 Connection Boots for Primary Disconnects, Surge Suppressors, and Bus

m

**mmmir

r-*"

pi CBSMMImmo

i>oMHftCO

Q*ooi> £5

i«iO

oh ,i - :*H;448

IllMg: '.saassSS*ricr^8&« SSSS

j 83 -^ -*-:

\

3«1»mmm m&m

msmmm.mfS5>

kS

Fig. 40 4.16 kV Inter Unit Barrier

41

Fig. 41 13.8 kV Inter Unit Barrier

Fig. 42 4.16 kY Primary Disconnect

«r ->r - -j :•> . .

' • - -

•- vV;v'. :

1 •

* r::V

J :-y ^ •'"r •

mS’. - :"3*m

m y - ;

}mm >:>•i b6* . »:* rSV s.g .. = • . v.V

iff! fi a*.=A* •

fc . ,;• • o.i .• •• >•

•• V?

Fig. 43 13.8 kV Primary Disconnect

42

00 >r - nna\ -

;"v<N • •f-;f.rooo'1 ’

5

SAFETYCATCH

Fig.44 Vacuum Metal-Clad Breaker Unit

43

jf .1 :1

GENERAL ELECTRIC COMPANYSWITCHGEAR BUSINESS DEPARTMENT

PHILADELPHIA, PA 19142

G E N E R A L <^j|E L E C T R I C

;'/

i%

Sv-5

U *>'3-79