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
THE METAL-CLAD SWITCHGEAR DESCRIBED S BOOK HAS BEEN DESIGNED AND TESTED
OPERATE WITHIN ITS NAMEPLATE RATINGS.
EQUIPMENTTO FAIL, RESULTING IN BODILY
THIS INSTRUCTION BOOK HAS BEEN
OPERATE , AND MAINTAIN TYPE VAC-CLAD-W S
THIS TYPE OF SWITCHGEAR, REFER TO THE PE
APPLICATION
DATA
'
32-265 .
- -
PREPA
CAUTION
OP:RA
lNJU
PURPOSE
REo-o
TO
ON
OUTSIDE
D PROPERTY DAMAGE.
...
E..?
ENGINEERS ANO TECHNICIANS INSTALL,
O ·
..
G=.AR. FOR INFORMATION ON THE APPLICATION OF
:=>,.r-
ANSI STANDARDS AND
OF
THESE RATINGS MAY CAUSE
TO
CUTLER-HAMMER
Page
THE
1
~
SAFETY
ALL SAFETY CODES, SAFETY STANDARDS, AND
TO WHEN INSTALLING, OPERATING, OR MAINTAJNING
...
SAFETY REGULATIONS MUST BE STRICTLY ADHERED
DANGER
THJS
EQUIPMENT .
Effecti
ve 12/97
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 SWITCHGEAR
8.1 SAFETY FEATURES ............................................................................................................................ ................ 19
8.2 INTERRUPTER POLE UNIT MOUNTING ............................................................................................................
19
8.3 RING-TYPE CURRENT TRANSFORMERS .............................................
............................................................
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
P
age
3
FIGURE TITLE
PAGE
1 HANDLING OF INDOOR SHIPPING GROUP .................................................................................................. 6
2 A TYPICAL 5/15
2 B TYPICAL 27
KV
INDOOR BASE PLAN
KV
INDOOR FLOOR PLAN .......................................
...
................................................................................................
......
...
............................................................. 10
2 C TYPE 5 KV ND INDOOR FLOOR PLAN .........................................................................................................
3 INSERTION OF DRAW-OUT EXTENSION RAILS ......................................................................................... 14
3 A LIFTING AND SETTING OF BREAKER IN HOUSING .............................................
4 AUXILIARY WITH FUSE DRAWER
5 DRAW-OUT DRAWER FOR
IN
DRAW-OUT POSITION ..
.......
.........................................................
VOLTAGE TRANSFORMERS ............................................................................ 15
6 DRAW-OUT DRAWER FOR CONTROL POWER TRANSFORMER ...................
7 AUXILIARY COMPARTMENT WITH
8 CT BARRIER
...
.............................................................................................................................................
SHUTTERS ...........................
................................................................
9 BREAKER PRIMARY DISCONNECT SHUTTER ..........................................................
9 A RING TYPE CT'S .......................................
10 MANUAL OPENING OF SHUTTER USI
11
VC
-W SWITCHGEAR BREAKER PAN ASSEMBLY ..................................................................................
12 A MAINTENANCE TOOL ................................
12 B LEVERING CRANK ........
...
...............................................................................................................
12 D BREAKER LIFTING YOKE .....................................
12 E RAIL CLAMPS ··············
···
···· ..............................
12 F EXTENSION RAILS ..........................................
13 ZERO SEQUENCE CURRENT TERMINAL CONNECTIONS .............
14 A TYPICAL 5
14 B TYPICAL 27
TO
15 KV TAPING CONNECTIONS ............................................................................
KV
TAPING
...........................
...
.........................................
NG
MAINTENANCE TOOL ........................................... ..
....
.............................
...
...................................................................................... 23
.....
....
....
........
........................................................................ 23
...............
................................................................... 22
.............................................................................................. 23
...
..............................................
...
...............
...
.......................................
15 PORTABLE BREAKER LIFTER OUTLINE DRAWING .........................................................
16 TEST CABINET OUTLINE DRAWING ........
.........
...........................................................................................
...................................... 14
...
........................................ 15
................................. 20
...
......................................
.................
..... 21
.............. 22
...
.......
................ 26
.......
............
................. 27-28
...
.......
...
............. 29
...
..
9
11
15
20
20
. 20
21
25
30
Eff
ect
ive
12/
97
Page
4
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
necessary to ship the
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
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
check it to make sure all the parts described on the
shipping list have been received.
discarding the packing material to prevent losing parts.
of
switchgear vertical sections it may be
sw
itchgear in several groups to
labeled with the shop order number and a shipping
ar
rives at the installation site ,
Do
this before
If the switchgear has been damaged, file a claim as
soon as possible with the carrier and notify the nearest
Cutler-Hammer representative.
It the switchgear
has been received, unpack it and handle it accord
the procedure outlined
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
1.2 HANDLING INDOOR SWITCHGEAR
Table 1 gives the approximate
combinations of switchgear and the various rating of
breakers. The ve rtical section refers to the way the
breaker compartment and the auxilia ry compartme nt
are arranged in front of the switchgear. The
combinations are: breaker over breaker B/B; breaker
over auxiliary B/
auxiliary over auxiliary
1.8.
32-255ARC
is
going to be installed as soon as it
in
the following paragraphs. If the
OF
EQUIPMENT.}
werghts of the various
A;
auxili
ary
over breaker
NB
; and
NA.
ing to
IF:."l•N
Effective
12/97
1.8. 32-
255
Pages
TABLE 1
TYPICAL WElGHTS (POUNDS)
TYPE
OF
MAJ
,
- s
INDOOR
VERTICAL
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
Effective
12/97
Page
6
Lifting 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. 32-255
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 Skid
,,,,....._
__
Middle Skid
~l-----
Tie Member
Front
Skid
Effective
12/97
1.8.
32-255
Page
7
1.3 STORING
Packaging for shipping is not suitable for storage Pa"'
of the original packaging may be discarded when
switchgear is removed from the carrier. Switchge ar be
runs, beca_use
particularly vulnerable to moisture and dirt during
storage.
If the switchgear must be stored for a while , prepare a
suitable storage space. Keep it indoors
bu
ilding that is clean and dry. The floor should
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 air to move under it
freely. -
Take
steps to protect the switchgear against dampness
cement dust, corrosive atmospheres, and extreme
temperature changes .
sure the equipment is well ventilated. Install temporary
space heaters if necessary.
Switchgear should be checked periodically for
of deterioration.
Storing the switchgear outdoors is not recommended.
It is the responsibility of the purchaser to assure
protection during storage.
STORAGE
EQUIPMENT
All parts should be stored with the same care as the
main switchgear.
Summary
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 includ ing open doors,
windows, drafts , etc
INDOOR
of
OF
SPARE PARTS AND MISCELLANEOUS
of
storage procedures :
SWITGHGEAR
their open connection ends, are
in
a heated
To
control condensation, make
_.
·
be
a,ny
signs
oc
door storage .
set
:>e" odically.
;"
.::..
CC~
DETAILED INSTRUCTIONS ON STORING
C-
G=A.R
= -
:: = S
REFER TO DRAWING 7009214, A
:-iE
'JRAWING IS ATTACHED TO EACH
~TC
HGEAR.
DANGER
&
RECO
The only peo e s'" ""'1 be allowed to install,
operate,
the quali
Electr
To
perform o - on
trained and
circurts. e,
and ope
hazards
Before a.
sure o de-energize botn tne primary and secondary
circu
Never leave a breaker in an intermediate position in its
compartment. Always crank the breaker into the fully
connected
Before removing a bolted-on cover first make sure that
all the circuits have been de-energized.
Never try to disconnect
a current transformer that
this situation the transformer develops a dangerous
high voltage . Before attempting work either de-energize
the circuit by opening the breaker or short-circuit the
secondary of the current transformer.
ic
ts.
E
DED S -:TY
or
nar:a.
1ca
Sa•e
e'.T'p·
or
...
'?:J-
Cooe
·-
exoe
erceo
~
o
of
tt s equ prnent and aware
ng
·o
withdrawn position.
PRACTICES
,..
ec
...
·oment are those who meet
-ere":S
:le~
do
described in the National
l)'P8
of equipment, one must be
woncmg
1ar
any maintenance, always be
or
open the secondary circuit of
is
carrying load current.
with high-voltage
with the construction
of
the
In
Effective 12/97
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 tie 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 OF THE INSTALLATION PROCEDURE
1. PREPARE THE FOUNDATION
REVIEW THE INSTRUCTION.BOOKS AND
DRAWINGS CARE
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 maintenance. 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 the 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 highe r 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 part of the Installation, be sure the
floor steel under the transformer conforms
to
the
specifications
of
these manufacturers.
F. Install the conduits in the foundation.
When the 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
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12/9
7
KV
TYPICAL FLOOR PLAN
56
3
---
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32
MIN.
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.
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..
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6
___,_
7
..
Page
10
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TYPICAL INDOOR BASE PLAN
~,,//
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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
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sur.Gcs-
rn LJCAr101s
rOR
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ALTERNAT(
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38
IN
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C(),IDUI TS
Effective 12/97
1.8. 32-255
Page
11
LINC
C:J~PT
B
US
COHP'
BKR
9625
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CLL
ARAllC(
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.
ER Sii l TC'iGEAR
CXT!:ND
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BE
CrtiOL
'I
ro
GS
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IT
D
FIG.
Effecbve
2C 5 KV
12/97
ND
TYPICAL FLOOR
PLAN
70 H
0
lf\
'-,
Page
12
2. ALIGN THE SHIPPING GROUPS SIDE BY SIDE ON
THE
FOUNDATION.
A. Remove the crating and packaging material from
the groups of switchgear that are going to be
installed.
B.
Let the shipping skids remain on each group until
the group has been moved into i
ts
final installation 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 out from the middle.
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 installed, line up the power transformer and the adjacent 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 of the 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
SYSTEM TO THE CHANNE LS IN THE
FOUNDATION.
Check the 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 location). 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 furnished
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
Page
13
(IEEE STD. 141);"GROUNDING
POWER
SYSTEMS
" (IEEE PUBLICATION
OF
INDUSTRI
141
AL
.
FORMERLY AIEE 953); AND "THE NATIONAL
ELECTRIC CODE
",
ARTICLES
100,
200
, AND
2SC
FOR GENERATING STATIONS AND LARGER
SUBSTATIONS,
BE
ONE
OHM
AND
SMALL SUBSTATIONS, THE GROUND
RESISTANCE SHOULD
(THE NATIONAL ELECTRIC CODE STATES
GROUND
OHMS
.)
7. RECONNECT
THE
GROUND
OR
LESS. FOR INDUSTRIAL PLA S
BE
RESISTANCE S
LESS
THAN
FIVE
HOv
OH
.........
S.
THATTP::
RESISTANCE SHOULD NEVER EXCEED 25
THE HIGH
VOLTAGE
BUS
WrER
::
IT
WAS DISMANTLED BETWEEN GROUPS.
A. Remove the horizontal and vertical
from the cable compartment. Remove the
bus barrier. (Also remove
such
as
potheads, surge suppressors,
interfere with access
B. Obtain the section
separate
the
groups for shipping. Eact,
any
to
the bus compartme1:t.
of
bus th
at
labeled and shipped in the carton w1
metal ba-ne~
other
componeMs
was re
t!l
etc. tha
mo
SectxYI
ea
e
ma
...
·
c
s
details.
C.
The
surfaces
plated . Clean the plated surfaces
section
in
the bus joints are n ors Iv
of
the
bus
by
brushing them lightly with crocus cloth
er
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 section is disconnected for shipping, the
splice plates and hardware are l
the bus in each
Sandwich the end
the
splice plates and fit the other end
be
tween the splice plates on the end of the bus in the
of
the adjoining vertical secti
of
the
disconnected section between
eft bolted
of
to
the
end
ons
.
the section
of
adjacent section. Bolt the splice plates together on each
end
of
the bus section .
Repeat these steps for each section
of
bus
at
each
shipping break.
Tighten the bol
ts
in the splicl= plate to the torques
shown in table 2. ·
Cover joint with insulating
8. RECONNECT
THE
DISCONNECTED AT
boot
(or tape) provided.
WIRING WHICH WAS
THE
FACTORY FOR
SHIPPING. THE WIRING IS LABELED.
A. Connect t
to
the terminal blocks mounted within the front
he
wiring to the remote apparatus and
of
the vertical sections .
9
R::PLA
OTH
R=M
COM
) CONN ECT
CE
THE METAL BARRIERS AND ANY
ER
PARTS THAT MAY HAVE BEEN
OVED TO
GIVE
ACCESS
TO
PARTMENTS.
THE
MAIN POWER CABLES.
THE
BUS
Before connecting a cable, determine its phase.
"'lle
swi
connec
tchgear
tions for phasing
system is usually supplied with
1-2
·3
left to ri
ght
ram the front). Check the shop order drawing to
make
sure because
ay
have been specified.
3 I two systems are to be
somet
imes another phasing
paralleled, make sure
e phase rotation and the phase angle a
same.
Th
ey
must
be
the same to prevent damag-
~
the equipment.
conform
drawing
relays
to
the
so
that
will operate
C. Vlhe'l forming cables
compartment
ai<e
sure
edges
that could
Teble 2 • BoltTightness for Bus Connections
Bolt Material Torque In Foot-Pounds for Bolt Size
High Strength Steel
Sil
icon
Bronze
D.
Follow the instructions of the cable manufacturer
to determine
permitted. Follow
the joints so the insulation will ta
through
vary
the
with the type and size
service voltage for which it w
The
phase rotation must
phase rotation on the shop or
the instruments, meters, and
properly
.
to
fit inside the cable
. avoid bending it sharply
it doesn't re
dama
.25-20
5
5
what
the
cor
rect gradient. The insulation will
st
on
sharp
corners
ge t
he
insulation.
.31-1 B
12
10
.38-16 .50-
20
15
50
40
minimum bending rad
instructions on insulating
per
properly
of
cable
and
as
des
igned.
E. Solderless connectors are usually furnished.
connection must be insulated according to the
recommendation
F. If potheads
furnished, follow
manufacturer when connecting
U
se
the flexible connectors to connect the aerial
lugs
to
the conductor
the insulators of the pothead
Tape
(or
otherwise insulate) the entire
(including
the
of
the cable manufacture r.
or
other
types
of
the
instructions of the
s.
This will keep strain oft
flexible connectors).
terminators are
the
cable to them.
or
the
terminator
SEE SECTION 10.
(viewed
re
or
kinking
.62-
13
ii
is
with the
joint
the
der
or
11
95
55
The
.
Elfective
12/97
Pa
ge
14
G. If zero sequence current transformers are used,
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
TH E
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 per section 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. t Rollers on the sides
of
the draw-
ers ride on the extension rails
.)
C. Check to make sure the primary contacts and
secondary contacts are engaged when the
drawer is closed. Use the "lighting out"
or
"ringing" 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 compartment 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. 32-255
Page
15
FIG. 4 TYPICAL AUXILIARY WITH DRAWERS
DRAW-OUT POSITION
FIG. 5 DRAW-OUT DRAWER FOR
VOLTAGE
TRANSFORMER
IN
FIG. 6 DRAW-OUT DRAWER FOR CONTROL
POWER TRANSFORMER
DANGER
&
SECTION 3
ADJUSTING AND TESTING
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
installation.
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.
or
Effe
ctive 12197
Pag
e 16
5. If the covers are removed from meters, relays,
or
other devices for installation or test, handle them
carefully. Replace the covers as soon as possible to
keep out dust and dirt.
6. Perform a loadi
ng
check of the control circuits.
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 damage. (The fuse should be one-'ourth the 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 with each switchgea r 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 breaker compa rtment 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 indicates the 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 precautions must be taken to ensure that personnel do not
come in contact with energized high voltage parts.
Failure 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 co nsidered energized until
the crew expecting to work on them is assured that
the circuits are de-energized, and until every possible 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 disconnected 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 and reliable 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 should
be independent of the grounds used for any other
apparatus. SEE GROUND BUS CONNECTIONS.
&
DANGER
5.2 ACCESS TO 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 compartment, 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 are deenerg ized.
2. MAIN CONTACTS AND CURRENT
TR
ANSFORMERS
Both the station
ary
main disconnecting contacts and
the ring-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 exercise d. Do not expose any
contacts
or
transformers unless all upper and lower
high voltage parts are de-energized. Failure to do
so
could cause personal injury
or
property damage.
E
ffective
12/97
1.8.
32-255
Page
17
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
BACK,COVERS , THE DISCONNECTING ASSEMBLIES OR
AGE CIRCUIT TO THE COMPARTMENT IS DE-
ENERGIZED AND PRECAUTIONS TO PREVEN T
RE-ENERGIZINp HAVE BEEN TAKEN. FAILURE
TO DE-ENERGIZE
PRECAUTIONS TO PREVENT RE-ENERGIZING COULD RESULT IN BODILY INJURY OR ELEC-
TROCUTION
CARRIES LETHAL HIGH VOLTAGES.
4. CONTROL EQUIPMENT
With the exception of apparatus such
transformers and rear mounted heaters, control
equipment and wiring is generally accessible
exposing high voltage parts .
SHUTIERS
. WHEN ENERGIZED, CIRCUIT
ATIEMPT
UNLESS THE HIGH
THE
TO REMOVE THE
CIRCUIT AND TO TAKE
as
curre
VOLT-
nt
wiihout
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 su it
tions. However, the following general requirements
should be helpful in setting up the program .
CAUTION: BEFORE
OR MAINTENANCE BE SURE THAT
AND CONTROL CIRCUI
GIZED AND GROUNDED AS REQUIRED
PROPER STEPS HAVE BEEN TAKEN TO
THAT
THEY
WILL REMAIN DE-ENERGIZED UNTIL
ALL WORK IS COMPLETED. FAILURE TO DO SO
COULD RESULT IN BODILY INJURY OR ELECTROCUTION. WHEN ENERGIZED, CIRCUIT CARRIES
LETHAL HIGH VOLTAGES.
ATIEMPTING
TS
HAVE BEEN DE-ENER-
1. INDIV IDUAL DEVICES
The maintenance schedule for individual devices
such
as
based upon recommendations contained
individual instruction book for
operations should be coordinated with
program to result
inconvenience and circuit shutdown.
circuit breakers, relays, etc. should be
the
in
the least operating
the
condi-
ANY INSPECTION
ALL
PRIMARY
AND
THAT
BE
SURE
in
the
device. These
the
overall
2 OVERALL INSTALLATIONS
n e switchgear installation should be given a
t
'"IOrou
gh overall maintenance check at
.
,..
e first year in service because it provides an
opport
unity to evaluate conditions at an early point
the
end
·,e fe of the equipment. Where conditions are
ab
'lOrm al, more frequent inspection and
ma ntenance is necessary, where conditions
::.rra
,t.
a longer period of time between
- r
·e,ance
_ _ '"e aaention:
-
3'..5ES
:).:
::-e
: "·
:s
Ear. ;g
er.
o ;r
ea
•e'leO
corr
ectlO'lS. suppor.s
v
aCUJm
~ce
. Wipe clean with a warm soap water solution ,
w1o
e d
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 occ
insulation resistance.
Periodic high potential tests are
recommended only after repair of high voltage buses
or
installation,
indicates it to be advisable. This field test should be
made before the main cables are connected and
sh
ould not exceed 14.25 KV, 60 HZ, 1 minute, for
4.
76
KV switc
KV
and
minute, for 27 KV switchgear. Transformer primary
fuses should
devices such
disconnected during high potential tests.
4. MAIN DISCONNECTING CONTACTS AND
SUPPORTS
Remove each break
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
atmospheric conditions is severe, leaving deposits
on
the
by a light application
breaker while it is out of the housing for all items
recommended in the instruction book applying to
that particular type
BOOK 32-255-1.
periods may
~
rn
CONNECTIONS
~
ze
:>
rim
ary
'-Y"'
• e
pnmary
ta•:.e
-
=.
GGER" readings between phases
nd
'lS08Ct for signs of overheating
"SU
a·
O'l
cieaner with a long nozzle will be of assis-
ry.
ur
that would indicate a lowering of the
or
when the trend
hgear; 27
15
.0 KV
sw
be
removed
as
capacitors and arresters
not
harmful unless corrosion
surface. If necessary, these can be removed
be
used. The following
circuits and remove cover
compartments . Before
. ~em
ov
e dust from buses,
and
enclosure surfaces. A
not
required and are
of
megger readings
KV, 60 HZ, 1 minute, for 8.
itchgear; and
and
er
from its co
of
crocus cloth. Check each
of
breaker. SEE INSTRUCTION
45
KV,
60
HZ, 1
surge protective
mpa
rtment.
due
to
of
in
or
25
Effective 12/
97
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 or dirt. 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 recommende d 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 cond ition of each switchgea r 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 periods. 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 variation in insulation resistance
between different switchgear assemblies
emphasizes the value of a series of readings which
can be charted
to
establish a
nor
mal insu lation level
so that progressive weakening
of
the insulation can
be
recognized.
13
.ABNORMAL CONDITIONS
Local conditions such as high humidity, salt-laden
atmosphere, co rrosive gases, heavy dust,
or
severe
circuit 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 maintain the equipment in satisfactory condition.
In some locations conditions may be
so
bad that the
frequency
of
maintenance will interfere with operating 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 maintain 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 SWITCHGEAR 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
powde r lubricant
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 parts, 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 prope r
ty
and cause severe injury.
FOLLOWING ARE TWO
OF
THE INTERLOCKS:
1. CODING PLATES
A cod ing 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. It the
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
Page 19
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 OF THE
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 acci dentally touching the primary
contacts. Shutters also cov
er
the station
ary
d1SC01111ects
for draw-out transforme
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 CURRENT TRANSFORMERS
The ring-type current transformers are mounted so they
slip over the primary 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 they 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-ene rgized without handling
high voltage connect ions
or
breaking the primary
insulation. The polar i
ty
marks on the transformers show
the relative instan taneous 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.
Page
20
FIG. 7 AUXILIARY COMPARTMENT WITH
PRIMARY SHUTTERS CLOSED.
FIG.
8 CT BARRIER (SHUITERS BLOCKED OPEN)
1.8.
32-255
FIG. 9 BR
EAKER PRIMARY DISCONNECT SHUTTERS
(CT
BARRIER REMOVED)
FIG. 9A RING TYPE CT'S
(S
HUTT
ERS
BLOCKED OPEN)
Effective • 2/97
1.8.
32-255
8.4 AUTOMATIC SHUTTER
The automatic shutter closes when the circuit bre
aJce
· 15
withdrawn from the compartmen
t.
The shutter cove-s
the primary contacts and keeps workmen from corr :
into contact with them. The shutter is raised by a
~er
on the breaker when the breaker is levered into e
connected position. When the breaker is levered a
t.
-
the shutter closes by pos itive action.
In
figure 9 the c-
barrier has been removed from the compartment so
r-e
shutters can be seen.
&
DANGER
8.5 KEV INTERLOCKS
Keylock interlocks are often supplied in conjunctio"
·.
disconnecting switches, dummy elements and spec a.
compartments to which access is to be denied un ess
the
circui1
breakers controlling the power to these no-
load-switching devices have been withdrawn to the tes
position. The operation of key interlock schemes is
generally described by a note or keying chart on the
shop order ass~mbly drawings.
CAUTION: TO
FACILITATE
MANUFACTURE AND
INSTALLATION PROCEDURES, A KEY IS USUAL
LY
SUPPLIED WITH EACH LOCK. BEFORE PLACING
8.6PAN
ASSEMBLY
FIG.
11
Effecti
ve 12/97
Page21
S Cl-l
$EAR
WITH KEY INTERLOCKS IN
==~
0 , THE KEY SCHEME MUST BE
,..
~;:::E-U
LY
CHECKED; AND ONLY THE PROPER
= S
.£q
IN THE LOCKS. ALL EXTRA KEYS MUST
3::
~a.•ov
ED AND DESTROYED OR STORED
-::RE
OT AVAILABLE TO OPERATING
':).
==SONNE
L.
THIS PROCEDURE IS NECESSARY
: ',..,
E MPROPER USE OF SPARE KEYS WILL
-=-~
- THE INTERLOCKING SCHEME.
MANUALLY
OPE
rrNG CUBIC
LE
SHUTTE
RS
OVER
PRIA1.4R)
DISCONNECTS USING
MAlNTE!\A.;
CE
-;""OOL
Page
22
8.6 PAN ASSEMBLY CONTINU
ED
1 . Prevents BKR withdrawal without extension rails
in
place.
2. Grounds BKR
in
all positions.
3. Prevents removal of BKR
in
any position other
th
an
test/disconnect.
.
4.
The control wiring is arranged for pullout
disconnecting by means
of
a 25-point female
receptacle arranged to connect to a male plug
on the breaker. The seconda ry disconnect
is
the
connection for the control leads between the
removable breaker and the stationary housing.
SEE
BREAKER INSTRUCTION BOOK FOR
FURTHER DESCRIPTIONS.
5 & 6. Racking screw and moving block: Permit breaker
insertion and withdrawal.
7. Used with 9 to prevent levering a closed BKR.
May be used
to
padlock a BKR
in
any position.
8. Indicates when BKR is in fully connected
position.
9. Used to prevent removi
ng
a closed BKR.
"
10. The mechanism-operated compartment switch
(MOC SWITCH) is an assembly of switches that
is operated by a lever
on
the breaker
mechan ism. It can contain
as
many as 12
normally closed and 15 normally open contacts
(beneath cover) in the standard design.
In
the
ND (narrow design), the maximum number of
MOC contadts available is 9 normally closed and
12 normally open.
The MOC switch
is
mounted beneath the cover
to the right with the operating mechanism
directly to the left.
The MOC switch is act ivated by the breaker
closing. It extends a lever out the bottom of the
mechanism pushing down on the plunger of the
operating mechanism. This, in turn
transmits the motion to operate the switch.
11
. The truck operated cell switch (TOC SWITCH)
has 9 poles
in
the normal design - 4 contacts
make and 5 break as the breaker is levered to
the connected position. As the breaker is being
levered into the connected position, a bracket on
the breaker pushes the TOC SWITCH lever
during the last inch of travel. As a result, the
TOC SWITCH can be used to electrically
indicate whether
or
not the breaker is
in
the
connected position (beneath cover). In the ND
design, the TOC switch has 7 contacts - 3
contacts make and 4 contacts break.
I.B.
32-255
12. Allows opening of primary breaker disconnect
shutter using maintenance tool when breaker is
removed.
13. Code Plates: See safety features on page 1
9.
14. Optional provision for padlocking (up to 4 locks)
a breaker in any position.
15. Seals primary compartment when breaker is
connected.
16. Rail on which breaker rolls.
SECTION 9
ACCESSORIES
Each new VAC-CLAD installation is provided with a set
of accessories. Depending upon customer's specifications and the nature of the installation, the accessories
will include one or more of the following:
FIG
. 12A A MAINTENANCE TOOL
USED
FOR:
MANUALLY CHARGING T
HE
BREAK[R
CL
OSING SPRING
AND
MANUALLY
OPENING THE SHUTTER.
FIG. 1
2B
A LEVERING CRANK
FOR
MOVING THE BREAKER BETWEEN
THE DISCONNECTED
AND
CONNECTED POSITIONS.
Effective
12/97
1.8. 32-255
FIG
. 12D BREAKER UFTTNG YOKE
USED
FOR
ATTACHMENT TO BREAKER
FOR
LIFTI
NG BREAKER
BREAKER COMPARTMENT RAILS.
ON
OR
OFF
Page
9
.1
OPTIONAL ACCESSORIES
cS
....
CABI
NET
.\
teSt
cabinet is for electrically operating the breaker
·.
,er,
rt
is out
of
its housing. The cabinet includes
:x>'l;ro power connections, a cut-off switch, necessary
cx:,r-ro
co.~
e:Y.J
Secondary disconnect contacts on the breaker itself.
~
'.'0 3
:=or
ana e er I fting breaker
=
.-t-
For
liffr1g (
·docks· with the lowe• breaker pan assembly In place of
the extension rails.
equ pment, and a cable which has one end
...
ected
to
terminals in the test cabinet. The other
o'
e cable is a socket that connects into the
S:==:
FIGURE 16 FOR OUTLINE AND MOUNTING
=
SO
S.)
-=
LIFT DEVICE
.,
r1g
o•eaker up with compartment extension rails
on
to
or
off the rails. (SEE
GuRE
15.) I.L 32-275-1A provides complete
:!'LC'...ons
S~RT
re'TlO"t
80,0M
DOLLY
ng breaKer •ram lower compartment without
COMPARTMENT ONLY
).
This device
23
FIG. 12E RAIL CLAMPS
FOR CLAMPING BREAKER ON EXTENDED
RAILS FOR MAINTENANCE
FIG. 12F EXTENSION RAILS
FOR CLAMPING BREAKER ON EXTENDED
RAILS FOR MAINTENANCE.
BREAKER RAMP ASSEMBLY
For inserting or removing a breaker from the bottom
compartment
any lifting device.
STANDARD GROUNDING AND TEST DEVICE
The standard grounding and test device consists
draw-out element that is inserted into the vacuum circuit
breaker compartment in the same manner as the drawout vacuum circuit breaker element. The device includes
six insulated bushings arranged with isolating barriers
and ground bus connections .
bus
or
cables from either the bus
ground connection. Cable testing or "phasing out"
testing may be accomplished by connecting suitable
test equipment, as required, to the bushings . The bus,
line, and ground connections are separated from each
by isolating barriers with the bus and line connections.
Each is accessible after opening a front hinged door.
Since the standard grounding and test device has
making or interrupting ability, the circ
energized before the ground is connected
Complete instructions
them fully before use.
of
a vertical section without the need
The
grounding of either
line is accomplished by connecting suitable
or
the line bushings to the
uits must be
or
removed.
for
this device are provided. Read
of
no
de-
of
a
Effectiv
e 1
2/97
Page
24
ELECTRICALLY CLOSED GROUNDING AND TEST
DEVICE
This device combines the facility of the standard device
with an electrically closed switch for connect ing the test
circuit to ground
or
test equipment. The switch is
capable of closing against fault current and is interlocked to prevent an incorrect operation. Since the
switch has no interrupting ability, faults must be cleared
by an interrupter on the source si
de
of
the equipment.
&
DANGER
SECTION 10
METAL-CLAD SWITCHGEAR FIELD TAPING
PROCEDURE (5-15-27 KV)
MATERIALS FOR TAPING
FILLER: A putty-like material. TRADE NAMES: Scotchfil
or Nashau 1,02. Pieces of insulating tape may
be used.
INSULATING TAPE & PAD: High voltage EPR insulating
tape. TRADE NAME: Scotch
130C.
FIELD TAPING METHODS (SEE FIGURES 14A & 148.)
GENERAL
1. Elongate insulating tape 1 O to 25 percent during
application to ensure a smooth, tight fit. On pads
elongate corners only.
2. Should a tape roll expire, start the new role by
overlapping the previous end by
Y2
turn.
3. Appl y one layer of insulating tape, lapping as
specified in the chart, overlap any preinsulation by
1% inches.
JOINT-WITH HARDWARE
1. Clean area of dirt and foreign matt
er.
1.8.
32-255
2. Apply filler over bare conductor and hardware to
cover and smooth out the surface . Blend contour into
preinsulation surfaces. Cover conductors and
hardware with
at
lea
st
1
/s inch of filler.
3. Apply pad(s)
of
insulating tape
of
sufficient width to
overlap preinsulation by one inch or more.
4. Apply one layer of insulating tape, lapping as
specified in the chart, overlapping any preinsulation
or
pads by 1
Y2
inches.
Taping Chart
Preinsulation
Insulating
Tape
kV
on
or
Pad
Overlap
Lap
of
No
. of
Swgr.
Min.,
Inches
Tape
Layers
Pads
Up to 5
1Y2
Y2
1 1
7.5 & 15 1%
213
1 2
27
1
14
213
2 3
DEFINITIONS
JOINT: Area to be covered with tape. Consists of bare
conductor and 1
Y2
inches
of
any preinsulation
next to the bare conductor.
PREINSULATION: Any insulating tape applied which is
wi
der
than one inch. Includes a band
of tape consisting of one or mo re
turns wrapped directly on top of each
other.
LAYER: Insulating tape, 1 inch wide, wrapped from one
end of the joint to the other (or to a pad) so
each succeeding turn laps the previous turn by
the amount specified in the chart .
OVERLAP: A specified distance measured along the
preinsulation starting from where the
preinsulation ends and t
he
exposed
conductor begins.
E
ffect
ive 12/97
I.B.
32-255
Switchgear Terminal,
Page
25
All Connee1lon1
(Such H Shl•ldlng) Must
bt
Carrlad Through
Current Tran1form1r and
Solidly
Load Side
Shown.
800
Volt
Leed,
Armo
A
Grounded
or
the
Vse
18
Wlr•
ln,ulatlon.
r, Conduit,
Pothead
Bu1hin;1
to
Ground
on
CT
the
the
II
with
Etc.--------
Cable Co
nntct
....
ioris
Laed
To
Swr.
:..:.
------
~
Lud
, Armor, Conduit, Interstice
Ground
Conductor,
Terminated
on
Trentlormer
,
-""'
thl
Load
....
and
Sidi
....
. Etc. Murt
Solldly Grounded
of
tht
Currant
Mo'"""
bl
FIG.
Effec
13
tive 12/97
Pothead
Groul>d
Must be Carried
the
Current Trenslorrner
and
Solidly Grounded on
the
Load Side
es
Shown
with
Conduit,
. Use lf6 Wire
600
Volt Insulation
Power
When
of
C.bleJ
Ltod
Through
the
CT
-i
----.;.L.--,IIL-L
Used----
Cable Connection1
--_..
To
To
Load
Swit
>+-----
.------
~-----
chgear Potheadl
Electrical
Bet-•n
- - Covered
Cables
Currant Transformer
Conduit
Twmlnat,d
Grounded
Si
de
of
the
Tr1n1former
Joint
Required
f'otheed
end
or
Armored flower
Mull
be
end
Solidly
on
the
Load
Current
Leed
.J
Page
26
TYPICAL TAPE
JOINT
NO
HARDW
ARE
-
.-
OVERLAP
-..L..
A SECTION A·A
TY
PICAL TAPE JOIN
T
NOTE: Roll
po1itlon
durlna tapi
ng
11
dlf1arent 1or
uch
tape.
TYPICAL TAPE
AND
PAD
JOINT
la.. I
LA 1°"
0 TAPE
AND
PAO
LAP
FIG. ~A 5 4
5KV
APPLICATIONS
1.8.
32-255
E
ffec1ive 12/
97
m
iii'
0
""
<
<1)
~
....,
Ill
.
...
~
2
:!]
0
....
.I).
OJ
Cf)
l:
~
-i
....
I\)
~
"
~
~
-8
_
oz
fLOZ
\.._.
-
:
c;.
I TYPICAL JO
INT WITH . 12
rHK
~IN
,
•ILLER
OVER
BARE
JOIN1
PAD02
PAD•l
PADWJ
fLDZ
L 3• IYPILAL
JUINI
WITH PADS
• 2
~
• 3
<3 IN UIOC X .
OJOl
TAP(
OVER
PADOi
AND
f!LLER
LA~
fLDZ
),
FIG 2
TYPICIIL
JOINr
UITH 3 I N
WID!.
X
OJO
IAP[
OVt.R I ILLER
I'
IG
, 4 I
YPICAL
JUINT
111
lH PAU••
(3)
6 C X 030 PIECES
CF
TAP(
\
MAT[Rl4
LS
FILLEP - A PUT1Y-I.IK[ ttl>TrRIAI
TRADE
NAM[SllU
XS[AI DUrT SCAlfR
SCOTCI
rI
L.
VC
ST
NO
533Sl BO
AND
53351
wx
III
SUL
ATINu -
HIG~
vr.t
T
AGr
F'PR
'NSUL
ATI%
TAP[ TRAnr
NA>tf
,
SCOTCH
IJOC TAPE,
\ICST
NO 45 1
SISC
DE[! N lTJ
QNS
JOINT -
qRE.A
IU
Bl
CUVlRE.U
WI
IH
IA?l
CONSISIS
UI
BAR[
CUNDUCrD~
AND
I
'\
INfHn
nr
ANY
PRf'- IN~ll
AT!ON NEXT
TO
T
H(
Bl>RC
CO~OUCTOR
PRE-INSULATION -
ANY
INSULArJON
COVER
INCi
ADJACE~T
TO
AN
EXPOSED
CONDUCTOR
PRIOR
-o
JAPING
PAD
ANY
INSUcATING
TAPC
APPLICD
WHI
CII
IS
WJDCR
THAN
ONE
INCH
INCLUDES A SANO
or
T
APC
CONS I ST I NG
OF
ONE
OR
MORE
TURN
S
WRAPP(D
DIREC
TLY
ON
TOP
OF
CACH
OTHER.
LAYER
ovr,u11•
tt::111.:.111~
r.r,11
~Al
I
INSULATING
TArc I
INCH
UIDC. U~APPCD
FROI<
ONC
END
or
THC
JO
I~T
ro
T
..
!
OT
..
fll
<OR
re
/\ P/\0)
~D
li'./\CM ~11rcrrn
1NC.
TUPN
LAPS
Tit(
~Mt V
lllJ~
IU~N
IIY
IHt
A>iJlA'II
\~IL
It
11
I IN i>'I ~l
tAI<
I
-
"\f'L11
•11
:p Ol$1All<I.
t<IAllP
n
.i1
1~,
n•t:
~1'1.
- ltl'lllt.ATID~
I~~!
IN1 1'~1
.M Ill[
l'IIINI
111•
•1
I>
t·1>1
:• tNSUI.AI
IIIN
[NU
A~n
111.:
1,tMm;n
(CJdk._tCHIA
•1t.t•
11i,uLA I m
e. , .~[
I!
HI
,~
~0(1'.ljl
[!111!1
lj
(l
l'f'l'l
I(• I IIIN
111
"()11111
, 11~1<1
Ill
Iii l'/\(1 ~
ll
,QH(,~1~ UJQt
(;f
lL
11,,1
,,
1\1'1
r•II
LL
r.P1~1
s
,~~,
,,ir
Niu •nu nv
IIYINI
Al'l'llif,
Nil
fi,
11
I\Jl•N
'l'·
JJINII
,
1111;,.
,,~nw•~c
, , CLtol\ll i>urA
nr
nt1tr
•uo
rn1:1
1r,N
HAT!r
! .
Ill
~!'
r!Ulll
lll
11111<
ISl1!>NU~YL
AI.IOHOL
PRC• IN
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~
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II
ll'
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AND
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UIJI
TH( SURfl\C[, SL(ND
CONTOUR
INTO
PR::-
WSUlAI
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ccs
TRY
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- 1
MA
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r.
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WITH
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12
INCH
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LER
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< •r"t Y 3 co~ 030
THICK
PAD
11
OVER
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11
•
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<f
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I\PPLY J 00
X 030 THI
CK
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STAR
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50
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rLU
IDIZC
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X 030 THICK
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MJ
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fROH
PAD
12
Af
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CXTE'IDING I 00
IN
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LY
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CK
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PER
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. 4,
6.
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UN
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7.
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OND
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G
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ANO
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t
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FIG 7
HP
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AL JOINT
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TH
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>
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9,
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12
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6
4 APPLY 3.0X.030 !HICK
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or
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C
fJG
7),
5
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030 lHICK
PAD
M? STARllNr.
~O
INCH
CRO
M CENT(R
AND
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IO
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I 1/ 4
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THICK
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00
FRO
M
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rnrNDING
I
no
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NSULAl
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6
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AT
INC,
I Al'I.
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us
I
Ill,
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so
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T
l<
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lJl0[7[
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7
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or
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c
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u~
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AYER
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ZC
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9
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f/AOOT C
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I
CUT
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AS
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AS
POSSIDL(
TO
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LCAN
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ar
DIRT
AND
ro.~EIGN
MATlER.
3. IIIPE rui lDIZC.CABLC
AND BOOT WllH ISOPROPYL
ALCOHOL
~l
• APPLY
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ER
or
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(I
DO
X .
030)
USING
213
LAP
AND
STARTING
l
,.
UP
CABLE
AtJO lXllND
ID
I o· OVER
(ND
CT
BOOT SNOUl
Pe:R I 11.o
. 10
~
APPLY A SECO
ND
LAY(R
Of'
IN
SULATING
TAPE Cl.
DO X
DJO>
USHIG
2/3
LAP
AND
(XTE~D
ING
O
SO
IN
CH
MINlMUH
BEV
OND
CACM
END
or
FIRST
LAY
ER
or
INSULATING
TAPE
P(R FIG
10
TERMINA
L
r
1c;
10•
TYPICAL
JOINT UI
TH
C~BLC/
BOOT
CONNCCT!ONS
CABLE
H •
l::11\V
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<I>
N
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I
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U'I
U'I
1.8.
32-255
?vu
. .
• i
Page
29
-------
~J
•
---
·----------
•
FIG. 15
Effective
12/97
Page30
(63.50)
1.8.
32-255
(
12.
(7.14)
.281
MTG.
ON
BACK
,..
H
DOOR
(
70)
DIA
HOLES
[NGEO
r
G
152. 40
<41
~
J
L'-------1
_
__.-
~
·
•
KNOCKOUTS
ON
1.5
•
9
(228.60)
·--
.S
(12.70>
.75
Cl9.0S>
TOP & BOTT
.
(38
.10)
12
(304
OR
O[A
(2)
•
.80)
Fig.
16
·--~~12~~~
(304,80)
120"
' .
(3048.00)
OF
CABLE
Effective
12/9
7
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