Cutler-Hammer VAC-CLAD-W METAL-CLAD User manual

1m:n CUTLER-HAMMER
E ffecti ve 12/97
INSTRUCTIONS FOR VAC-CLAD-W METAL-CLAD
SWITCHGEAR INDOOR HOUSINGS
1.8. 32-255

-
----------~,-..,.,--- --
1.8. 32-255
'
Page 1
CAUTION
THE METAL-CLAD SWITCHGEAR DESCRIBED S BOOK HAS BEEN DESIGNED ANDTESTED TO
OPERATE WITHIN ITS NAMEPLATE RATINGS. OP:RA ON OUTSIDE OF THESE RATINGS MAY CAUSE THE
EQUIPMENTTO FAIL, RESULTING IN BODILY lNJU D PROPERTY DAMAGE.
PURPOSE
THIS INSTRUCTION BOOK HAS BEEN PREPA
REo-o ... E..? ENGINEERS ANO TECHNICIANS INSTALL,
OPERATE, AND MAINTAIN TYPE VAC-CLAD-W S O ·
.. G=.AR. FOR INFORMATION ON THE APPLICATION OF
THISTYPE OF SWITCHGEAR, REFER TO THE PE
:=>,.r- ANSI STANDARDS AND TO CUTLER-HAMMER
APPLICATION
DATA 32-265.
~ DANGER
SAFETY
ALL SAFETY CODES, SAFETY STANDARDS, AND SAFETY REGULATIONS MUST BE STRICTLY ADHERED
TO WHEN INSTALLING, OPERATING, OR MAINTAJNING
THJS EQUIPMENT.
...
Eff ec ti ve 1 2/97

Page 2
TABLE OF CONTENTS
DESCRIPTI ON
SECTION 1 - RECEIVING, HANDLING AND STORING
1.8. 32-255
PAGE
1.1 RECEIVING ..................................................................................................... .. .....................................................4
1.2 HANDLING ....................................... .... ...... .. .......................................................................................................4-6
1.3 STORING INDOOR SWITCHGEAR ......................................................................................... .. .. ..........................7
RECOMMENDED SAFETY PRACTICES..................... .. ..............................................................................................7
SECTION 2 - INSTALLING SWITCHGEAR
2.1 OUTLINE OF INSTALLATION PROCEDURE .........................................................................................................8
2.2 DETAILS OF THE INSTALLATION PROCEDURE.............................................................................................8-15
SECTION 3 - ADJUSTING AND TESTING ................................................................................................................15
SECTION 4 - OPERATION OF THE SYSTEM ............................................................ .. . .. ....... .' .................................. 16
SECTION 5 - INSPECTION AND MAINTENANCE
5.1 SAFETY PRECAUTIONS .......................................................................................................................... .. ..... .... 16
5.2 ACCESS TO SWITCHGEAR PARTS .................................................................................................................... 16
5.3 INSPECTION AND MAINTENANCE SCHEDULE......................................................................................... .. 17- 18
SECTION 6 - LUBRICATION ............................. .. ........................ .. ................................................... .. ............... .. .... .. . 19
...
SECTION 7 • RENEWAL PARTS .... .. ........ .. .. .............................................................................. .. .............................. 19
SECTION 8 • A DESCRIPTION OF SW ITCHGEAR
8.1 SAFETY FEATURES ............................................................................................................................................ 19
8.2 INTERRUPTER POLE UNIT MOUNTING .............................................................................................. .. ............ 19
8.3 RING-TYPE CURRENTTRANSFORMERS ................... .. ........................ .... .. ...................................................... 19
8.4 AUTOMATIC SHUTTER ........................................................................................................................................ 21
8.5 KEY INTERLOCKS ................ .. . ... ........ .. ............................................................................................................... 21
8.6 PAN ASSEMBLY .. ..................................................................................... .. ..................................... .. ................... 22
SECTION 9 - ACCESSORIES -STANDARD.............................................................................................................. 22
9.1 ACCESSORIES -OPTIONAL. .. ........................................................................ .. .. ...........................................23-24
SECTION 10 -TAPING ............... ... ...................... .... ....................... .. ........ .. ............... .. . .. ................................. .. .. .. 24· 30
Effec tive 12/97

I. B.32 -255
LIST OF ILLUSTRATIONS
FIGURETITLE
P age 3
PAGE
1 HANDLING OF INDOOR SHIPPING GROUP .. ................................................................................................6
2 A TYPICAL 5/15 KV INDOOR BASE PLAN ... ........................................ .. ...................................................... ... . .. 9
2 B TYPICAL 27 KV INDOOR FLOOR PLAN ......................... .. ............ ... ............................ .. ...............................10
2C TYPE 5 KV ND INDOOR FLOOR PLAN ......................................................................................................... 11
3 INSERTION OF DRAW-OUT EXTENSION RAILS .........................................................................................14
3 A LIFTING AND SETTING OF BREAKER IN HOUSING ......... .. . .. ............. .. ........ .. ...... ... .. .................................14
4 AUXILIARY WITH FUSE DRAWER IN DRAW-OUT POSITION .. ... .. .. ............. .. .......................................... ... 15
5 DRAW-OUT DRAWER FOR VOLTAGE TR ANSFORMERS.................................. .. ..................................... .. .15
6 DRAW-OUT DRAWER FOR CONTROL POWER TRANSFORMER....... .. ..... .. ... ... .................................. .. ....15
7 AUXILIARY COMPARTMENT WITH SHU TT ERS ...................... .. ... .............................. .. .. .. .................... .. . .. ... 20
8 CT BARRIER ... ................................................................................ .. . .. ........................................................ .. 20
9 BREAKER PR IMARY DISCONNECT SHUTTER ......................... .. ........................... .. .. ............ .. ............... .. ..20
9 A RING TYPE CT'S ....... .. ............. .. ............... ... ............ .. ...................... .. ... ............... ... .............................. .. ... . .. .20
10 MANUAL OPENING OF SHUTTER USI NG MAINTENANCE TOOL ....... .. ................... .. ..... .. ........ ... .. ............ 21
11 VC -W SWITCHGEAR BREAKER PA N ASSEMBLY ............................. .. .......... .. ....................................... .... . 21
12 A MAINTENANCE TOOL......................... .. ..... .... .... .. ........... .. ..... .. ... ... .. ............. .. ...............................................22
12 B LEVERING CRANK ........ ... .................... .. ............ .. ......... .. .... .. ........................................... .. .. .. .... .. ... ........... .. .22
12 D BREAKER LIFTING YOKE ..................... .. . .. ........... ... ................ .. ................................... .. ...............................23
12 E RAIL CLAMPS · ·· ··········· ··· ····................... .. ... .. .... ..... .... .... .... .. .. .................... .. ................. .. ...............................23
12 F EXTENSION RAILS .......................... .. ......... .. ... .......... .. ........... .. ................................................... .. ................23
13 ZERO SEQUENCE CURRENT TERMINAL CONNECTIONS ............. ... .............................. .. .............. ... ... .. .. 25
14 A TYPICAL 5 TO 15 KV TAPING CONNECTIONS .. .. . .. ................................................................ .. ... ......... .. .....26
14 B TYPICAL 27 KV TAP I NG ................... .. ...... ... ...... .. ... .. .. ... ....................................... ... . ... ....... .. ... ... .. ...... .. .... 27-28
15 PORTABLE BREAKER LIFTER OUTLINE DRAWING ......................................................... ... ....... ... ......... .. ..29
16 TEST CABINET OUTLINE DRAWING . .. .. .. . ...... . .. ........................ .. ................... .. .. .. .................. .. .............. .. .... 30
Eff ect ive 12/ 97

Page 4
1.8. 32-255ARC
SECTION 1
RECEIVING, HANDLING AND STORING INDOOR SWITCHGEAR
1.1 RECEIVING INDOOR SWITCHGEAR
The switchgear is shipped to the customer as
completely assembled as possible. Depending on the
number
of switchgear vertical sections it may be
necessary to ship the
sw itchgear in several groups to
facilitate handling.
VCP-W breakers are shipped in individual containers.
See breaker I.B. 32-255-1 for breaker handling
instructions.
Each switchgear group and all the cartons and crates
are labeled with the shop order number and a shipping
weight. On one of the groups there will be a shipping
packet, securely attached, that contains the shipping
lists and storage and handling drawings.
When the switchgear
ar rives at the installation site,
check it to make sure all the parts described on the
shipping list have been received.
Do this before
discarding the packing material to prevent losing parts.
If the switchgear has been damaged, file a claim as
IF:."l•N
soon as possible with the carrier and notify the nearest
Cutler-Hammer representative.
It the switchgear
is going to be installed as soon as it
has been received, unpack it and handle it accord
in g to
the procedure outlined in the following paragraphs. If the
switchgear is to be stored, inspect it to make sure the
shipment is complete and undamaged. Repack it so it
will be protected until it has been installed. (SEE
SECTION ON STORAGE
OF EQUIPMENT.}
1.2 HANDLING INDOOR SWITCHGEAR
Table 1 gives the approximate werghts of the various
combinations of switchgear and the various rating of
breakers. The vertical section refers to the way the
breaker compartment and the auxiliary compartment
are arranged in front of the switchgear.The
combinations are: breaker over breaker B/B; breaker
over auxiliary B/
A; auxili ary over breaker NB ;and
auxiliary over auxiliary
NA.
Effective 12/97

1.8. 32 - 255
Pages
TABLE 1
TYPICAL WElGHTS (POUNDS)
TYPE OF
MAJ , - s
INDOOR VERT I CAL
VERTICAL
RA GS SECTION
SECTION
(A M?E'=1=3 (LESS BREAKER)
1200 2400
BREAKER / 2000 2500
BREAKER
3000 2600
BREAKER / 1200
23 00
AUXILIARY
2000 2400
3000 2500
1200 2300
AUXILIARY / 2000
2d-OO
BREAKER
3000 2500
AUXILIARY / 1200
2000
AUXILIARY
2000 2100
3000 2500
~
TYPE OF
CURRENT BREAKER BREAKER
RATING ELEMENT ELEMENT
BREAKER
AMPERES (S TATIC ) (IM PAC T)
50VCP - W250 1200 350 525
2000 410 615
3000 525 788
50 VCP-W350 1200 460 690
2000 490 735
3000 525 788
75 VCP - W500
1200 375 563
2000 410 615
3000 525 788
150 VCP - W500 1200 350 525
2000 410 615
3000 525 7
88
1 50 VCP-W 750 1200 350 525
2000 410 615
3000 525 78 8
150 VCP-W1000
1200 460 690
2000 490 735
3000 525 788
Effect i ve 12/97

Page 6
Lift in g members are bolled to the top of each shipping
group. Put a crane hook through each of the four holes
to li ft and move the group. After the group has been
moved into installation position remove the lifting
members and discard them.
If a crane is not available, move the group Into
installation position on rollers. Skids run the length of
the group. If the group is to be skidded sideways, the
front and back skids are enough. If it is to be moved
across its depth (from front to back), put in several short
skids across the depth of the group and roll it into
position on these. Jacking Plates may be bolted to the
sides of a shipping group to facilitate lifting the
switchgear, to place rollers, and slide switchgear in
place ._ These must be sized to handle the heaviest
shippi ng group.
1. 8.32 -2 55
NOTE: NEVER MANEUVER THE SWITCHGEAR
DIRECTLY ON THE ROLLERS.
ALWAYS USE THE SKIDS TO PROTECT THE
SWITCHGEAR FROM BEING DISTORTED OR
DAMAGED.
Handle all switchgear whether crated or uncrated with
great care.The instrument panel on the front of the
vertical sections contains delicate instruments, relays
and meters that can be damaged by rough handling. If
the switchgear is not put into service right away, cover it
to keep clean. SEE SECTION ON STORING OF
EQUIPMENT.
_..,t,,~!-- -- - - ~~-~C;iii"IO,e,,r- Rear Lifting Angle
~ ~----- -l\r-:-;;,i~-.,,,,.c...---+-- Spreaders (2)
CJ 1
CJ
D
D D D
Fig. 1 Handling of Indoor Shippi ng Group
Front Lifting Angle
Un it Depth X y z
96.25 24 .5 52 . 94 14. 88
86 .25 14 .0 52.
94
14.88
DETACHABLE JACK ING PLATES
Rear Sk id
,,,,....._ __ Middle Sk id
~l----- Tie Member
Front Skid
Effective 12/97

1.8. 32-255
1.3 STORING INDOOR SWITGHGEAR
Packaging for shipping is not suitable for storage Pa"'
of the original packaging may be discarded when
switchgear is removed from the carrier. Switchgear be
runs, beca_use of their open connection ends, are
particularly vulnerable to moisture and dirt during
storage.
Ifthe switchgear must be stored for a while, prepare a
suitable storage space. Keep it indoors in a heated
bu ilding that is clean and dry.The floor should be
smooth and level to prevent strain and distortion in the
equipment. Be sure the space is well-drained so there
is no standing water. Store the switchgear on its skids o
keep it off the floor and to allow airto move under it
freely. -
Take steps to protect the switchgear against dampness
cement dust, corrosive atmospheres, and extreme
temperature changes. To control condensation, make
sure the equipment is well ventilated. Install temporary
space heaters if necessary.
Switchgear should be checked periodically for a,ny signs
of deterioration.
Storing the switchgear outdoors is not recommended.
It is the responsibility of the purchaser to assure
protection during storage.
STORAGE OF SPARE PARTS AND MISCELLANEOUS
EQUIPMENT
All parts should be stored with the same care as the
main switchgear.
Summary of storage procedures:
1. Check the ventilation of the switchgear itself and of
protective coverings. Serious damage can result from
a non-ventilated tarpaulin.
2. Check the ventilation of enclosed storage areas of
buildings.
3. Check for adequate heat, when in doubt provide
heat.
4. Check for distortion.
5. Check for damage and standing water.
6. Check weather protection including open doors,
windows, drafts, etc _. ·
Effective 1 2/97
oc door storage.
set :>e"odically.
Page 7
;" .::.. CC~ DETAILED INSTRUCTIONS ON STORING
C- G=A.R REFER TO DRAWING 7009214, A
=- :-iE 'JRAWING IS ATTACHED TO EACH
:: =S ~TC HGEAR.
& DANGER
RECO E DED S -:TY PRACTICES
The only peo e s'" ""'1 be allowed to install,
operate, or nar:a. ... ,.. ec ... ·oment are those who meet
the quali 1ca '?:J- -ere":S described in the National
Electr ic Sa•e Cooe
To perform o - on ·- l)'P8 of equipment, one must be
trained and exoe erceo woncmg with high-voltage
circurts. e, ~ o :le~ 1ar with the construction
and ope of tt s equprnent and aware of the
hazards
Before a. e'.T'p· ng ·o do any maintenance, always be
sure o de-energize botn tne primary and secondary
circu ts.
Never leave a breaker in an intermediate position in its
compartment. Always crank the breaker into the fully
connected or withdrawn position.
Before removing a bolted-on cover first make sure that
all the circuits have been de-energized.
Never try to disconnect or open the secondary circuit of
a current transformer that is carrying load current. In
this situation the transformer develops a dangerous
high voltage. Before attempting work eitherde-energize
the circuit by opening the breaker or short-circuit the
secondary of the current t ra nsformer.

Page 8
SECTION 2
INSTALLING INDOOR SWITCHGEAR
2.1 OUT LINE OF INSTALLATION PROCEDURE
1. Prepare the installation foundation. It is
recommended that fl oor channels be imbedded in
the foundation to maintain a level surface.
2. Al the factory the switchgear system may have
been divided into groups to facilitate shipping. At
the installation site the groups must be rejoined to
form the switchgear system. Align the groups, side
by side, on the ti e bolt holes.
3. Bolt the groups together through the tie bolt holes.
4. Bblt or weld the base members of the vertical
section frame, front and rear, to the foundation
channels.
5. Remove all shipping braces.
6. Connect the ground bus.
7. Install the primary bus supports, insulated phase
conductors, and rubber snubbers removed for
shipping.
8. Reconnect the wiring between shipping groups.
Run the control wiring for remote apparatus through
the conduits in the foundation ( or on top of the
ver tical sections).
9. Replace the metal barriers in the bus
compartments.
10. Connect the main power cables and fully insulate
the terminals for the voltage class (SEE SECTION
10 & FIG. 14 FOR GUIDELINES).
11 . Replace the rear covers on all the vertical sections.
12 . Check the operation of the levering-in system in the
breaker compartments.
13 . Check the potential transformers and the control
power transformers in the auxiliary compartments.
14. Perform loading check on both control and primary
circuits to assure the system is ready for operation.
2.2 DETAILS OFTHE INSTALLATION PROCEDURE
1. PREPARE THE FOUND AT ION
REVIEW THE INSTRUCTION.BOOKS AND
DRAWINGS CA RE FULLY.
A. Locate the switchgear so there is enough aisle
space at the front and rear of the system.The
amount of space recommended is shown in Fig. 2.
1.8. 32-255
B. Leave enough space so the doors can be opened
and the breakers and transformers can be pulled
out for inspection and ma intenance. Leave enough
space at the rear so there will be room to install the
cables and to perform whatever inspection and
maintenance that may be necessary.
THE MINIMUM CLEARANCES ARE SHOWN IN FIG. 2.
REFER TO THE FLOOR PLAN DRAWING FURNISHED
WITH EACH ORDER.
C. Make sure the foundation is flat and level.
D. Design the foundation so it will be strong enough to
support the weight of the switchgear without
sagging. Table 1 gives the weights of the various
ratings of switchgear and breakers. Be sure to take
into account the shock or impact weight that occurs
when the breaker trips and when it closes.The
impact weight is 1.5 times the weight of the breaker.
The weights in the tables are only an approximation.
The actual weight will vary, depending on the type
and th e amount of equipment in the switchgear. Use
adequate safety factors.
E. The recommended foundation consists of steel
channels embedded in a level concrete floo r. The
channels must lie in a flat and level plane. (A slope
of 0.125 inch in 3 feet in any direction is
acceptable.) In no case may the non-supporting
areas of the foundation be higher than the tops of
the steel channels.
The anchor bolts, channels, and other materials are
to be furnished by the purchaser of the switchgear.
A 4-inch structural channel is recommended as the
minimum size for the average indoor switchgear
system.
If unit substation transformers or high voltage
switches are pa rt of the Installation, be sure the
floor steel underthe transformer conforms to the
specifications of these manufacturers.
F. Install the conduits in the foundation.
When th e primary and secondary cables enter the
switchgear from below, the conduits that carry them
are embedded in the foundation.A floor plan
drawing is furnished with each order. Use this
drawing to determine the conduit layout, the circling
of the steel around single phase conductors rated
600 amps or more should be avoided to prevent
overheating due to induced currents.
Effective 12/97

1.8. 32-255
TYPICAL
~,#$##&
0
LIN(
CO MPT
B US
CO HPT
B KR
CON TR Cll
CO H PT
961'5
J E, Ml 'I
. .. so
..
56
3
:X.,""X) :J 3~ E PLAN
--- __;~ 32 MIN. ___ __,.
0
0)
FIG. 2A 5/15 KV TYPICAL FLOOR PLAN
Effe c tive 12/9 7
0 SUGGESTED LOCATIONS f'OR
. :lO I NCH SOLIS CR V [LDI NG
G\ Sf.COI DARY CO N TR OL
\V VJRl'II,; CClNDU I - OPEN JN~S.
CONDUJ r PROJECTION MUSl
NDT DCCED I I NCk .
,;,. HINIHUM rRONT CL E ARANCE
~/ IIHEN USING CUT L ER-HAMMER
PORT~BLE LI rT ER
('.;'\ MINIMUM LEr- OR R!G HT
V •IHCi(D PANEL CL E AR~NCE
© .COK DED H INI H UM
<>:..-. Cl.[ARANCE
f:\ r1 .. :s,co Ftl1.JNDA TION
'=.} ::..P-ta: 1'-'C.I.UDI 'IG
r ..LIPS~: MUST BE
T ... T Al: U:VEL AND
,.. ~.£ P\J,'<
{'::';\ •~ S'U.... I• USED,
~ ,.LT oCl" O:ca:D lHIS
:loC'C!J::N :El> SVITCHGEAR
Q rt IS.0 TQJ',DATIOH
\:!/c . ,~_i~ 36 !N01
::LC... ~ EXTEND
Gi IP9'J,.-...:,r CH.;,/) t.CN])UJ 1
~ ;,v-_:c:; 11:N ·s 1 'CJT
o= z ;..a<s SEE
S>O' .,:,lC;o- !~ ~LA'I
r:,; ~1,. Lct.,\TlO,,.,S.
r;;,.~S~D
~ ~ s; o,.s PROVIDED
A!: S:-0". , Et Sf~B:ll. ON
S-tJ> [R:,CD ~C-IIJ'<A.
S X !t ,'S
€, ~ J CH ~ 1 I MJM
C~M "EL SUPP_ IE D
BY CUSTMER.
t:7\ :':JJF .... "!IJH ll"t:CR
~ S,.l""OC£~ ~T BE
, • Lc..s- 3 ,NCt<S
l"ICJ'
ALTERNATE SECCl'4=t CONDJll
LOCAT !DI\ TCP ENTRANCE
l<NIJCK[)JTS rOR I IN.
OR 1.2:S CONDUI TS
. _l
6
.. __ ___,_
7
Pag e9

..
Page 10
Ll1'(
CC><PT
BUS
( [NP!
l!KP
C OMl>l
TYPICAL INDOOR BASE PLAN
~,,// f ,,/ ,,/ ,'.~/// ,,/// 4
G)
36 MIN
96 25
32 MIN- - --+- --- 26 -----+-32 MlN - - --I.
0 8
70 MIN
0
FIG. 28 27 KV TYPICAL INDOOR FLOOR PLAN
1.8. 32-255
([) sur.Gcs- rn L JCAr101s rOR
5C : NCH BOLTS OR V[LDING
/';'\ SECONDARY CCJNTRCl.
\::.) JIRING CCINOUJl OPEN I NGS ,
CCN DU IT PROJEC 11 ON ..US1
~OT EXCCCD I I NCH.
r.:\ MINIHUII rRCN I. CLE A RANCE
\:.,I WHEN USING 1w)
PCRTADLE Ll >T(R
0 M
:N IHU"I LEFT CR RIGHT
HI NGE:D PANEL CL( A Rl'NC[
0 R£C:ll*£1'0Ct IIINIHJ>
REAR CLEARANCE
© f
.N IS~D FC1JNDA1 ,r,-,,
SURrAC, t:NCLUDING
rLOJR 1TEEL> MUST BE
FLAT AND LEVEL AND
:N TRJE PLANE
r:;).. FLOOR STEEL I, USED ,
V,Y HUST NJT (XC[El) THIS
DIHCIISJO,, UNDER S\IITCHGEAR
~ F"INISH, D fCUNDATl:JN
'5'cv1THIN 05 INCH
CL[<UWICC> ~UST (Xl[ND
U NlJCR sv1-0iC£aR
MlNl"IUM 1.50 IN:H IC
MAXJ""" 3 Jl'ICH(S
17:"\ P~lMARY ( H V. ) CONDUll
\V PRC.JCCT JIN MUST ,o-
EXC£(0 2 INCHES. SEE
SHCJ' !JlD[R DAS[ PL AN
roR CONDUIT LOCATIONS.
r.;-,, CUSl OME:R ' S GROUNO
\.:J PROVISIONS. PROV! D[O
AS SHO JN BY SY~IIOL Ill<
SHOP CJRDCR ScCTIDNAL
SIDE Vl[VS
@ 4 I NCH MI \I I MUM
CHANN E_ SLPPL!ED
BY CUSTOMER .
ALTERNAT( SECO NDARY CCNDUll
LCX:AT!CN TOF (NTRANC.E
KNOCKOUTS FOR I 38 IN
CR I 75 C(),IDUI TS
Effective 1 2/97

1.8 . 32-255 Page 11
LINC
C:J~PT
B US
COHP'
BKR
9625
0
26 HIN.
• • 50
19
I 25
56
TYPICAL IND OO BASE PLAN
22 -- - --<
3
IJL 56
26 J 22MIN
©
70 H lf\
0
FIG. 2C 5 KV ND TYPICAL FLOOR PLAN
Eff ec bve 12/97
O SU GGES T ED LOCATIONS ro P.
50 lflCH BDL TS QR SELCINC,
(';\ SECONDARY Cil'ITROL
\::..) VIRING CO.DU il OPEf\lN GS
: ONO U IT PROJECT ION H UST
'IDT EXCE£D I I NCH
(';\ '1 :NIMU1 rRONl CU ARAl'C (
~ VHEN USING CU 'L[R-HAMM[R
DQRTA BLE L !I T[R
8
©
'1 INI HU1 LffT OR RIGHT
1ltr.,(0 PANEL CLL ARAllC(
~C!JH 'IDIO [D M INI MUM
'EP~ C-E A~AN C(
Q q.,1Sli0l ~OU 'IDATION
\.:.; ~ACE ( 11\CLLDII\G
r~ ST E!:L > t'UST 3E
i L Al A"'IID _[VE.L ~ND
I "1JE PLIINE
r.;:,. rLOCP STEQ Ir J S ED .
\:Y ~I NOT E>CEED THIS
Jf'4(>,SID1 UND ER Siil TC'iGEAR
r.:;;,.. rf .SrED rOU,,DATIQN
\:..:J c. J .. "41N 06 . HCH
CU::AP ... C: ..us- CXT!:ND
/;;\_ P',:;l .. •'i Y (M I , C°"DU1 T
'.::.,/ Pq()JEC' 10,, HUST 1\ 01
EXCC!::I 2 INCHCS SEE
S,<J!> ORDER B"SC: Pl.AA
r~ CO.!IUI-LDCATID~S
r;;\ CVS '04CP' S :.ROUND
\J PPOVIS;Cl'IS. PROVIDCD
AS Sl-0\/N BY SYMilDL [),I
Sl'IJP OPDEP seer l(J,jl\l
~!DE v:cus
(v 4 INCH MINIM UM
CHANN EL SUPPL Tr D
BY cus-OMER .
,.;., rouNDAT ION UNDER
~ SUI TC ,< G[AP '1UST BE
AT LEAST J lNC.<ES
THICK.
AL T[R NATC SECO NDARY CrtiOL IT
LO C AT ! [),j T OP ENTRANC(
KNJCKOUTS raR I I 'I
DR I 25 CONDUI -s

'-,
Page 12
2. ALIGN THE SHIPPING GROUPS SIDE BY SIDE ON
THE FOUNDATION.
A. Remove the crating and packaging material from
the groups of switchgearthat are going to be
installed.
B. Let the shipping skids remain on each group until
the group has been moved into i ts final installa-
tion position. (The skids help protect the
switchgear and reduce the risk that it will be
damaged or distorted during the move.)
C. If an odd number of groups is to be installed,
install the middle one first. Then install the other
-groups, working outfrom the mi dd le.
If an even number of groups is to be installed, start
with either group on either side of the middle shipping
break.
If a unit substation or a power center is being in-
stalled, line up the powertransformer and the adja-
cent switchgear group first. Set them in the position
called for on the drawing of the base plan.Then
install the rest of the groups.
D. Handling the switchgear by crane is the preferred
method.
Move the first group into position. Line up the bolt
holes in the base of the vertical sections with the bolt
ho les in the steel channels in the foundation.
A few inches in front of the line-up draw a base line
along the length of the intended location of
switchgear. As the groups are maneuvered into place,
keep the front of each group parallel to the base line.
E. A bolt at each end of the wooden skids holds
them to the base ofthe group. Lift and remove
the bolts, and discard the skids.
F. Set the group into its installation pos ition. Use a
level to make sure the group is level both across
its width and along its length. Use a plumb line to
make sure the group is plumb. (To level or plumb
the group use shims arthe points where the
vertical sections will be bolted to the floors.}
Move each group i nto po_sition and repeat the
preceding steps.
G. If no crane is avail~ble the groups may be moved
on the skids and rollers.
1. 8. 32-255
3. BOLT THE GROUPS TOGETHER THROUGH THE
TIE BOLT HOLES.
A. Remove the back covers from the vertical sec-
tions at the shipping group. Insert and tighten tie
bolts in the rear upright members.
8. Open the front panels on these vertical sections.
Insert and tighten tie bolts between the front
upr ight members.
4. BOLT OR WELD THE ENTIRE SWITCHGEAR
SYSTEMTO THE CHANNELS IN THE
FOUNDATION.
Checkthe system aga in to make sure it is level and
plumb.
5. REMOVE ALL THE SHIPPING BLOCKS OR
BRACES.
A. Examine all the meters, relays, etc. and remove
any shipping blocks or braces. The time dials on
the relays are set at zero in the factory so the
rel ay contacts will be closed during
shipping.
6. CONNECT THE GROUND BUS.
A. The ground bus in the switchgear is assembled in
sections.There is a joint in each housing.
Solderless terminals are provided on the ground
bus (See the shop order drawing for their loca-
tion). Use these terminals to connect the ground
bus to the station ground. Make the connection
as direct as possible. It should be large enough
to carry the ground fault current of the installa-
tion. Never house it in a metal conduit.
8. The standard ground bus is a .25-inch X 2-inch
copper bus bar bolted to the cross members of
the frame in the bottom of each enclosure.The
ground bus runs through the center of each
section through the length of the entire
switchgear system.Where the system is split for
shipping, a splice plate (and hardware) is fur-
nished to bridge the shipping break when the
system is installed.
NOTE:THE IMPORTANCE OF ADEQUATE
GROUNDING CANNOT BE OVERSTRESSED. FOR
THE DESIGN AND INSTALLATION OF A GROUNDING
SYSTEM REFER TO "ELECTRIC POWER
DISTRIBUTION FOR INDUSTRIAL PLANTS"
Effective 12/97

1.8. 32-255
(IEEE STD.141);"GROUNDING OF INDUSTRI AL
POWER SYSTEMS " (IEEE PUBLICATION 141 .
FORMERLY AIEE 953); AND "THE NATIONAL
ELECTRIC CODE ", ART I CLES 100, 200 , AND 2SC
FOR GENERATING STATIONS AND LARGER
SUBSTATIONS, THE GROUND RESISTANCE S HOv .........
BE ONE OHM OR LESS. FOR INDUSTRIAL PLA S
AND SMALL SUBSTATIONS, THE GROUND
RESISTANCE SHOULD BE LESS THAN FIVE OH S.
(THE NATIONAL ELECTRIC CODE STATES THATTP::
GROUND RESISTANCE SHOULD NEVER EXCEED 25
OHMS .)
7. RECONNECT THE HI GH VOLTAGE BUS WrER :: IT
WAS DISMANTLED BETWEEN GROUPS.
A. Remove the horizontal and vertical meta l ba-ne~
from the cable compartment. Remove the ma ...
bus barrier. (Also remove any other componeMs
such as potheads, surge suppressors, etc . tha ·
interfere with access to the bus compartme1:t.
B. Obtain the section of bus th at was re mo ea c
separate the groups for shipping. Ea ct, SectxYI s
labeled and shipped in the carton w1 t!l e
details.
C. The surfaces in the bus jo ints are n or s Iv er
plated. Clean the plated surfaces of the bus
section by brushing them lightly with crocus cloth
only if necessary.Then wipe clean.
D. Slide the section of bus through the supports in
the side of the vertical section. Slide the rubber
snubber along the bus until it fits inside the
opening in the bus support.
When the bus se ction is disconnected for shipping, the
splice plates and hardware are l eft bo lted to the end of
the bus in each of the adjoining vertical secti ons .
Sandw ic h the end of the disconnected section between
the splice plates and fit the other end of the section
be tween the splice plates on the end of the bus in the
adjacent section. Boltthe splice plates together on each
end of the bus section.
Repeat these steps for each section of bus at each
shipping break.
Tighten the bo l ts in the splicl= plate to the torques
shown in table 2. ·
Cover joint with insulating boot (or tape) provided.
8. RECONNECT THE WIRING WHICH WAS
DISCONNECTED AT THE FACTORY FOR
SHIPPING. THE WIRING IS LABELED.
A. Connect t he wiring to the remote apparatus and
to the terminal blocks mounted within the front of
the vertical sections.
Elfective 12/97
9 R::PLA CE THE METAL BARRIERS AND AN Y
OTH ER PARTS THAT MAY HAVE BEEN
R=M OVED TO GIVE ACCESS TO THE BUS
COM PARTMENTS.
) CONNECT THE MAIN POWER CABLES.
Page 13
Before connecting a cable, determine its phase.
"'lle swi tchgear system is usually supplied with
connec tions for phasing 1-2 ·3 left to ri ght (viewed
ram the front). Check the shop order drawing to
make sure because somet imes another phasing
ay have been specified.
3 I two systems are to be para ll eled, make sure
e phase rotation and the phase angle a re the
same. Th ey must be the same to prevent damag-
~ the equipment. The phase rotation must
conform to the phase rotation on the shop or der
drawing so that the instruments, meters, and
relays will operate properly .
C. Vlhe'l forming cables to fit inside th e cable
compartm e nt . avoid bending it sharply or kinking
ai<e sure it doesn't re st on sharp corners or
edges that could dama ge t he insulation.
Teble 2 • BoltTightness for Bus Connections
Bolt Material Torque In Foot-Pounds for Bolt Size
.25-20 .31-1B .38-16 .50- 13
.62- 11
High Strength Steel 5 12 20 50 95
Sil icon Bronze 5 10
15 40 55
D. Follow the instructions of the ca ble manufacturer
to determine what minimum bending rad ii is
permitted. Fo ll ow the instructions on insulating
the joints so the insulation will ta per properly
through the cor rect gradient. Th e insulation will
vary with the type and size of cable and with the
service voltage for which it w as des igned.
E. Solderless connectors are usually furnished. The
connection must be insulated according to the
recommendation of the cable manufacturer.
F. If potheads or other types of terminators are
furnished, follow the instructions of the
manufacturer when connecting the cable to them.
U se the flexible connectors to connect the aerial
lugs to the co nductor s. This will keep strain oft
the insulators of th e pothead or the termina t or .
Tape (or otherwise insulate) the entire joint
(incl ud ing the flexible connectors).
SEE SECTION 10.

Pa ge 14
G. If zero sequence current transformers are us ed ,
pass the power cables through the transformer.
Connect it to the terminals or to a pothead (See
standard drawing 7008222 or Figure 13).
11 .REPLACE THE REAR COVERS ON A LL THE
VERTICAL SECTIONS.
12 .Insert draw-out extension rails per figure 3 to install
breakers.
13.Install the breakers per figure 3A using optional
portable lifter shown, or other device.
14 .Test breaker and cell interface persection 4 of
breaker I.B. 32-255-1.
15.Check the voltage transformers control power
transformers and draw-out fuses in the auxiliary
compartments.
A. The transformers or draw-out primary fuses are
mounted in separate drawers in th e auxiliary
compartments. (See figures 4,5, & 6.) They are
adjusted in the factory and shipped installed in
the switchgear.
B. Insert extension rails into each si de of the
auxiliary compartment per figure 3.Turn the two
drawer handles and pull the drawer out of the
compartment.tRollers on the sides of the draw-
ers ride on the extension rails .)
C. Check to ma ke sure the primary contacts and
secondary contacts are engaged when the
drawer is closed. Use the "lighting out" or "ring-
ing" method.They should engage when drawer is
with in 1.0 i n. of being closed.
D. Check the fuses for continui ty. Make sure there is
proper contact in the fuse clips.
E. Suspended from inside the top of the compart-
ment are three flexible, grounding straps. As the
drawer is pulled open watch insi de to make sure
they contact the fuses and ground them.
F. Make sure the mechanical interlock (or the key
interlock) is working properly for control power
transformers. When the interlock is working, it
should be impossible to pull the drawer out
without first opening the main secondary breaker.
FIG.3 INSERTION OF DRAW-OUT
EXTENSION RAILS
1.8. 32-255
FIG. 3A LIFTING AND SETTING OF BREAKER IN
HOUSING
Effecti ve 12/97

1. 8. 3 2-255
FIG. 4 TYPICAL AUXILIARYWITH DRAWERS IN
DRAW-OUTPOSITION
FIG.5 DRAW-OUTDRAWER FOR
VOLTAGE TRANSFORMER
Effe ctive 1 2197
FIG. 6 DRAW-OUT DRAWER FOR CONTROL
POWER TRANSFORMER
& DANGER
SECTION 3
ADJUSTING AND TESTING
Page 15
1. After the switchgear has been installed and
connected to the apparatus it is to control, give it a
final check before it is put into service. (Make sure
the apparatus being controlled is not connected to
the system while the tests are being carried out.)
The testing equipment will depend on the size and
type of installation. Use portable voltmeters. Rig up
some simple device for "ringing "or"lighting out''
circuits.
2. Examine all wiring circuits to make sure they have
not been damaged or loosened during shipment or
installati on .
3. Make sure all the connections are correct before the
equipment is operated. "Light out" connections
between the switchgear and remote apparatus such
as instrument transformers, auxiliary switches and
remote control and interlock circuits.
4. Coordinate the settings of the relays with other parts
of the system in accordance with the standards or
operating practice of the purchaser.

Pag e16
5. If the covers are removed from meters, re lays, or
other devices for installation or test, handle them
carefully. Replace the covers as soon as po ss ible to
keep outdust and dirt.
6. Perform a loadi ng check of the control c ir cuits.
A. Before energizing the control circuits, check the
control bus with an ohmmeter to make sure there
are no short circuits in the control wiring. If an
ohmmeter is not available, conne ct a small fuse
in ser ies with the source of the comrol power.
This will protect the control wiring against dam-
age. (The fuse should be one-'ourth th e normal
rating of the circuit.)
& DANGER
SECTION 4
OPERATION OF THE SYSTEM
1. Install the circuit breakers and check their operation.
2. Study and be sure to understand the diagrams
furnished wi th each switchgear system.
3. NOTE: AS CHECKS ARE BEING MADE THE
BREAKERS SHOULD BE IN THE TEST POSITION
WITH THE SECONDARIES MADE UP.
4. A green light on the hinged instrument panel on the
front of the breakercompartment shows the breaker
is open. A red light shows the breaker is closed. In a
D-C control scheme the red light supervises the trip
coil and indicatesthe trip coil circuit has continuity.
5. The details of the breaker control schemes vary from
o ne installation to another. They comply with the
requirements set forth by IEEE, NEMA, and ANS I.
All of the schemes are designed to coordinate
electrically with the mechanical design of the
breaker. & DANGER
SECTION 5
INSPECTION AND MAINTENANCE
5.1 SAFETY PRECAUTIONS
When inspecting, repairing, and performing mainte-
nance on metal-clad switchgear, the fact that dangerous
voltages may exist must be kept in mind; and precau-
tions must be taken to ensure that personnel do not
come in contact with energized high voltage parts.
F ai lure to do so could result in personal injury or
property damage.
1.8. 32-255
SOME COMMON GENERAL PRECAUTIONS FOR
HIGH VOL TAG E WORK ARE:
1. All connections should be considered energized until
the crew expecting to work on them is assured that
the circuits are de-energized, and until every pos-
sible precaution has been taken to see that there is
no chance of a circuit being energized while the
crew is working.
2. Switches which have been opened to de-energize a
circuit to perm it work on equipment should be locked
or blocked open and a suitable visible warning
device placed on them.
3. Do not work on parts normally carrying current at
high voltage until these parts have been discon-
nected and grounded to the ground bus. Provision
should be made by the purchaser for connecting
adequate flexible ground leads to every part of the
switching equipment.
4. A good an d re liable ground connection is necessary
for every switchgear installation. It should be of
sufficient capacity to take care of any abnormal
condition that might occur on the system and sh ould
be independent of the grounds used for any other
apparatus.SEE GROUND BUS CONNECTIONS.
& DANGER
5.2 ACCESSTO SWITCHGEAR PARTS
1. HIGH VOLTAG E PARTS
VAC-CLAD-W METAL-CLAD SWITCHGEAR is
designed so that internal compartments provi de
metal isolation between the circuit breaker compart-
ment, the main bus, and the primary line termina-
tions. Access to high voltage parts is provided by
removable covers and barriers which should not be
removed unless the parts to be exposed ar e de-
energized.
2. MAIN CONTACTS AND CURRENT
TR ANSFORMERS
Both the station ary main disconnecting contacts and
the ri ng-type current transformers are located behind
the glass polyester CT barrier.
Upper and/ or lower contacts and transformers are
easily exposed (See figure 10). For this reason
caution must be exercised. Do not expose any
contacts or transformers un less all upper and lower
high voltage parts are de-energized. Fa ilure to do so
could cause personal injury or property damage.
E ffective 12/97

1.8. 32-255
3. DISCONNECTING TRANSFORMERS AND FUSES
Simply opening the drawer automatically discon-
nects and grounds the moving high-voltage parts.
Shutters automatically cover the primary discon-
nects.
CAUTION: DO NOT ATIEMPT TO REMOVE THE
BACK,COVERS, THE DISCONNECTING ASSEM-
BLIES OR SHUTIERS UNLESS THE HIGH VOLT-
AGE CIRCUITTO THE COMPARTMENT IS DE-
ENERGIZED AND PRECAUTIONS TO PREVENT
RE-ENERGIZINp HAVE BEEN TAKEN. FAILURE
TO DE-ENERGIZE THE CIRCUITAND TO TAKE
PRECAUTIONS TO PREVENT RE-ENERGIZING -
COULD RESULT IN BODILY INJURY OR ELEC-
TROCUTION . WHEN ENERGIZED, CIRCUIT
CARRIES LETHAL HIGH VOLTAGES.
4. CONTROL EQUIPMENT
With the exception of apparatus such as curre nt
transformers and rear mounted heaters, co ntrol
equipment and wiring is generally accessible wiihout
exposing high voltage parts.
& DANGER
5.3 INSPECTION AND MAINTENANCE SCHEDULE
To assure high quality service, a definite maintenance
schedule, systematically followed, is essential. Plant,
operating, and local conditions vary to such an extent
that the schedule must be prepared to suit the condi-
tions. However, the following general requirements
should be helpful in setting up the program.
CAUTION: BEFORE ATIEMPTING ANY INSPECTION
OR MAINTENANCE BE SURE THAT ALL PRIMARY
AND CONTROL CIRCUI TS HAVE BEEN DE-ENER-
GIZED AND GROUNDED AS REQUIRED AND THAT
PROPER STEPS HAVE BEEN TAKEN TO BE SURE
THAT THEY WILL REMAIN DE-ENERGIZED UNTIL
ALL WORK IS COMPLETED. FAILURE TO DO SO
COULD RESULT IN BODILY INJURY OR ELECTRO-
CUTION.WHEN ENERGIZED, CIRCUIT CARRIES
LETHAL HIGH VOLTAGES.
1. INDIVIDUAL DEVICES
The maintenance schedule for individual devices
such as circuit breakers, relays, etc. should be
based upon recommendations contained in the
individual instruction book for the device. These
operations should be coordinated with the overall
program to result in the least operating
inconvenience and circuit shutdown.
E ff ective 1 2/ 97
Page 17
2 OV ERALL INSTALLATIONS
n e switchgear installation should be given a
t '"IOrou gh overall maintenance check at the end of
. ,.. e first year in service because it provides an
opport unity to evaluate conditions at an early point in
·, e fe of the equipment. Where conditions are
ab 'lOrmal, more frequent inspection and
ma nt enance is necessary, where conditions
::.rra ,t. a lo nger period of time between
- r ·e,ance periods may be used.The following
_ _ '"e aaention:
- 3'..5ES ~ rn CONNECTIONS
:).: ::-e ~ ze :> rim ary circuits and remove cover
: "· :s '-Y"' • e pnmary compartments. Before
Ear. ;g ta • :.e - =. GGER" readings between phases
er. o ;r nd 'lS08Ct for signs of overheating or
ea •e'leO "SU a· O'l . ~em ov e dust from buses,
corr ectlO'lS. suppor.s and enclosure surfaces. A
v aCUJm cieaner with a long no zzle will be of assis-
~ce .Wipe clean with a warm soap water solution,
w1o e d ry.
After buses have been dusted and wiped clean, take
"MEGGER" readings again between the buses and
ground and between phases. Keep a record of these
readings for future reference in determining when
trends oc c ur that would indicate a lowering of the
insulation resistance.
Periodic high potential tests are not required and are
recommended only after repair of high voltage buses
or installati on , or when the trend of megger readings
indicates it to be advisable. This field test should be
made before the ma in cables are connected and
sh ould not exceed 14.25 KV, 60 HZ , 1 minute, for
4. 76 KV sw itc hgear ; 27 KV, 60 HZ , 1 minute, for 8. 25
KV and 15 .0 KV sw itchgear; and 45 KV, 60 HZ, 1
minute, for 27 KV switchgear.Transformer primary
fuses should be removed and surge protective
devices such as capacitors and arresters
disconnected during high potential tests.
4. MAIN DISCONNECTING CONTACTS AND
SUPPORTS
Remove each break er from its co mpa rtment.
De-energize primary circuits and expose primary
contacts and their supports. Wipe clean with a cloth
moistened in a non-flammable solvent. Inspect for
abnormal wear or overheating. Discoloration of the
surfaces is not harmful unless corrosion due to
atmospheric conditions is severe, leaving deposits
on the surface. If necessary, these can be removed
by a light application of crocus cloth. Check each
breaker while it is out of the housing for all items
recommended in the instruction book applying to
that particular type of breaker. SEE INSTRUCTION
BOOK 32-255-1.

Page 18
5. OTHER DISCONNECTING CONTACTS
Inspect all primary and secondary disconnecting
contacts such as those on draw-out transformers for
abnormal wear, fatigue, or overheating. Replace if
necessary. Otherwise treat the same as main
disconnecting contacts above.
6. CONTROL CONTACTORS
Contacts should be inspected and dressed or
replaced when the surface becomes pitted. Unless
repetitive duty has been experienced, little attention
should be required.
7. INSTRUMENTS, RELAYS AND OTHER PANEL
MOUNTED DEVICES
Individual devices should be maintained according
to the specific instructions supplied for each device.
Remove all relay covers and inspect the interiors for
dust ordirt. This operation can most readily be
performed by relay test personnel dur ing period
relay tests.
8. SECONDARY WIRING
Check all wiring connections for tightness including
those at the current and potential transformers
and at the terminal blocks where circuits leave the
switchgear. Make sure that all secondary wiring
connections are properly connected to the
switchgear ground bus where so indicated.
9. MECHANICAL PARTS
Visually cheak and manually operate mechanical
moving parts such as the shutter,TOC and MOC
switch assemblies, the position interlock, hinged
door s, and the draw-out features of the transformers
and fuses. Examine mechanical mating parts such
as the breaker secondary contacts blocks, side rails
and trippers.
10.VENTILATION
Check all labyrinths, grillwork, and air passages for
obstructions and accumulations of dirt.
11 .BATTERY AND CHARGING EQUIPMENT
The control battery is such- an important item in
switchgear operation that it must be given special
periodic attention if it is to give reliable service for a
long period of tim e. Periodic inspections and tests
are recommended in the battery supplier(s)
instructions. At the same time the battery is checked,
inspect the battery charger and remove
accumulations of dust and dirt. On all chargers
having a manual transfer switch for setting the
1.8. 32-255
charging rate, check carefully to be sure that the
selector switch is returned to the value appropriate
for a floating charge at the end of the periodic
inspection. Serious damage to the control battery
can occur if the charger is left on a high charging
rate for an extended period of time.
12.RECORDS
The condition of each switchgear unit at the time of
inspection should be listed in a permanent record to
become a guide for anticipating the need for
replacements or for special attentiqn between the
regul ar maintenance periods. Megger tests are
suggested for checking the insulation. A series of
these tests will indicate any tendency toward a
reduction in dielectric strength of the insulation.
Megger readings should be taken before and after
cleaning the equipment and, where possible, under
similar conditions at successive perio ds . Records
should include the megger reading, t he temperature
and the humidity.The readings will vary with the
extent and design of the bus structure. In contrast
with a small installation, the longer switchgear
assemblies will have a more extensive bus structure
with a greater number of insulators and thereby, a
longer number of par allel insulation resistance paths
to ground which will tend to decrease megger
readings. This vari at ion in insulation resistance
between different switchgear assemblies
emphasizes the value of a series of readings which
can be charted to establish a nor mal insulation level
so that progressive weakening of the insulation can
be recognized.
13 .ABNORMAL CONDITIONS
Local conditions such as high humidity, salt-laden
atmosphere, corrosive gases, heavy dust, or severe
circ ui t operating conditions, are considered to be
abnormal; and will require more frequent inspec-
tions.
It should be emphasized that a series of inspections
should be made at quarterly intervals until the
progressive facts of the local conditions can be
analyzed to determine a schedule which will ma in-
tain the equipment in satisfactory condition.
In some locations conditions may be so bad that the
frequency of maintenance will interfere with operat-
ing and production schedules. In such cases,
consideration should be given to the possibility of
enclosing the switchgear equipment in a relatively
tight room and to supplying a sufficient quantity of
clean air to ma intain a positive pressure in the room.
Under such conditions maintenance schedules may
then be established on a more normal basis. Such
an arrangement might also provide for cooling the air
where the amb ient temperature is relatively high,
thus further improving operating conditions.
Effective 12/97

1.8. 32-255
SECTION 6
LUBRICATION
& DANGER
VAC-CLAD-W SW ITCHGEAR is designed so that
lubrication is not required under normal conditions.
However, abnormal local conditions such as high
humidity, salt-laden atmosphere, corrosive gase s, or
severe circuit operating conditions may demand the use
of lubricants. In such cases a dry or powder lub ri cant
should be used on moving or mating mechanical parts
and a thiniilm of vaseline on disconnection contacts.
The application of the lubricants should be held to a
minimum to reduce the accumulation of the du st and
dirt.
SECTION 7
RENEWAL PARTS
When ordering renewal or spare pa rt s, include as much
information as possible. In many cases the style number
of the new part can be obtained from identification on
the old part. Always include a description of the part.
Specify the rating, housing number and shop order
number of the metal-clad housing in which the part is to
be used.
SECTION 8
A FURTHER DESCRIPTION OF VAC-CLAD-W
SWITCHGEAR
8.1 SAFETY FEATURES
Westinghouse VAC-CLAD-W SWITCHGEAR is
manufactured with several built-in interlocks.These
interlocks are intended to protect persons working on
the equipment. Never make these interlocks inoperative.
Doing so can damage proper ty and cause severe injury.
FOLLOWING ARE TWO OF THE INTERLOCKS:
1. CODING PLATES
A coding plate is fastened to the bottom front edge
of the breaker compartment. There is also a coding
plate fastened to the front of the breaker. Itthe
breaker has a lower interrupting rating than the
rating of the compartment, or if the voltage and
continuous current characteristics don't match, the
coding plate on the compartment will prevent the
entrance of the breaker into the compartment.
E ffective 12/97
Page19
NOTE: EVEN WITH THE CODING PLATES IT IS
POSSIBLE TO PUT TO THE COMPARTMENT A
BREAKER WHOSE CONTROL WIRING IS NOT
COORDINATED WITH THAT OF THE COMPARTMENT.
ALWAYS CHECK THE SHOP ORDER DRAWING TO
MAKE SURE THE CONTROL WIRING OFTHE
BREAKER AND THE COMPARTMENT ARE BOTH
THE SAME.
2. AUTOMATIC SHUTTER
An automatic shutter, shown in figure 9, covers the
primary disconnecting contacts when the breaker is
withdrawn from the operating position.The shutter
prevents persons who are working on the
switchgear from accidentally touching the primary
contacts. Shutters also cov er the station ary
d1SC01111ects for draw-out tr ansf or me rs and primary
h.ses.
8.2 INTERRUPTER POLE UNIT MOUNTING
Each mounting is made of two glass polyester
mouldings backed up by a steel barrier.
(SEE IB 32-255-1 FOR FURTHER DETAILS.)
CONTACT STUD
May be flat, as shown, or round, dependent on
amperage rating. (SEE FIGURE 9A.)
8.3 RING-TYPE CURRENTTRANSFORMERS
The ring-type current transformers are mounted so they
slip over the pr imary contact insulating tube on the rear
wall of the breaker compartment. There is space for a
maximum, of four standard accuracy transformers per
phase (2 on each side of the breaker). A polyester CT
barrier, shown in figure 8, restricts unconscious access
to the CT's.
They are mounted so th ey can be reached from the
fr ont of the enclosure (SEE FIGURES 9 & 9A ). This
makes it possible to add or to change transformers
when the switchgear is de-energized without handling
high voltage connections or breaking the primary
insulation. The polari ty marks on the transformers show
the relative instantaneous polarity in the primary and
secondary windings.The diagrams show how to
connect the transformers to give polarity needed to
operate relays and instruments.
CAUTION: DO NOT MANUALLY RAISE OR REMOVE
SHUTTER UNLESS MAIN CONTACTS ARE
DE-ENERGIZED AND SAFETY PROCEDURES HAVE
BEEN INITIATED TO MAKE SURE THE CIRCUITS
CAN NOT BE RE-ENERGIZED. FAILURE TO
EXERCISE CAUTION MAY RESULT IN BODILY
INJURY AND PROPERTY DAMAGE.