Replace upper primary stab support with primary bus
extensions. Fasten with four 3/8” hex bolts to the
primary insulator. Use 3/8 bolt, lockwasher and washer
torqued 20-25 ft-lbs.
Align vacuum interrupter stationary contact. Insert
M16 hex bolt through lockwasher, washer, upper stab
support and primary bus extensions. Manually engage
bolt into interrupter by applying hand torque only.
Fasten the insulating support plate to the upper
primary stab support. Use four hex socket flat head
screws. Clean external and internal threads. Apply
“Loctite” Primer T to the external and internal threads.
Apply “Loctite” threadlocker 262 to the external
threads. Engage and torque 8-10 ft-lbs.
14.5. VS15050 Vacuum Interrupter Applied in Circuit
Breakers Rated 1200A (Figure 53).
With interrupter in alignment under stab support,
place the primary extension into the gap between stab
support and interrupter stationary contact. Make sure
contact surfaces are wiped clean.
Replace, finger tight, two 3/8 fasteners joining the
primary extension to the stab support.
Insert an M16 hex bolt through lock washer, washer,
stab support, and primary extension. Align interrupter
stationary contact, and (by hand) engage the M16 bolt.
Fasten two 3/8 fasteners securing the primary exten-
sions (26-36 ft-lbs).
14.6. VS15050 Vacuum Interrupter Applied in Circuit
Breakers Rated 2000 and 3000A (
Figure 54
) Having
sperate phase barriers..
Allow interrupter to rest on lower stab support.
Replace upper primary bus extension with attached
insulating plates. This component is awkward, so it is
helpful to have an extra person to hold the parts while
the bolts are inserted. Install six (three on each side)
hex socket flat screws to secure the insulating plates to
the lower primary support. Screws should be loose.
Install the upper primary stab support. Fasten with
four 3/8 hex bolts to the primary insulator. Use 3/8
bolt, lock washer and washer torqued to 20-25 ft-lbs.
Connect the upper primary extension to the upper
primary stab support, using two 3/8 socket head
screws, torqued to 12-17 ft-lbs.
38
Overhaul
13. Slip the flexible shunt clamp over the movable contact
stem of the interrupter. Replace clamp hardware,
bolt(s), washer(s), and nut(s). Raise clamp until it bears
on step or retaining ring 33 to 48mm up from the end
of the stem.
14. Stationary Contact Assembly
14.1. VS12015, VS25002, and VS17006 Interrupters. Align
copper spacer bar with large hole in stab support. Insert
long M12 bolt through lockwasher, washer, stab support
and copper spacer. Align interrupter stationary contact
and (by hand) engage the M12 bolt (
Figure 48
).
14.2. VS10006 and VS10028 Interrupters in Circuit
Breakers rated 1200A (
Figure 47
).
With the interrupter in alignment under stab support,
place the primary extension into the gap between stab
support and interrupter stationary contact.
Make sure contact surfaces are wiped clean.
Replace, finger tight, two 3/8 fasteners joining the
primary extension to the stab support.
Insert an M16 hex bolt through lockwasher, washer,
stab support and primary extension. Align interrupter
stationary contact, and (by hand) engage the M16 bolt.
Fasten two 3/8 fasteners securing the primary
extensions (26-36 ft-lbs).
14.3. VS10006 Interrupter in 2000A Circuit Breakers
(
Figure 50
).
With interrupter aligned under the primary stab, place
the 3/8” copper spacer between primary extensions and
stationary contact of the vacuum interrupter.
Insert the M16 hex bolt through a lockwasher, washer,
stab support, primary extension and 3/8” copper spacer.
Align vacuum interrupter stationary contact, and (by
hand) engage the M16 bolt.
14.4. VS10028 Vacuum Interrupter Applied in Circuit
Breakers Rated 2000 and 3000A (
Figure 49
).
Allow interrupter to rest on the lower stab support.
N
No
otte
e:: F
Fiin
ng
ge
err ttiig
gh
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en
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on
nlly
y!! E
Ex
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essssiiv
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mp
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g ffo
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e a
att tth
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e m
ma
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y
d
de
effo
orrm
m m
mo
ov
va
ab
blle
e cco
on
ntta
acctt sstte
em
m..
Later in this procedure a trunnion bolt will be inserted and secured. After
this bolt’s insertion and adjustment, the clamp may then be tightened.
N
No
otte
e:: S
Stta
attiio
on
na
arry
y cco
on
ntta
acctt iiss a
an
nn
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ea
alle
ed
d cco
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pp
pe
err..
Thread damage will occur if threads are crossed. Be sure the bolt can be
fully engaged with light manual torque.
N
No
otte
e:: S
Stta
attiio
on
na
arry
y cco
on
ntta
acctt iiss a
an
nn
ne
ea
alle
ed
d cco
op
pp
pe
err..
Thread damage will occur if threads are crossed. Be sure the bolt can be
fully engaged with light manual torque.
N
No
otte
e:: S
Stta
attiio
on
na
arry
y cco
on
ntta
acctt iiss a
an
nn
ne
ea
alle
ed
d cco
op
pp
pe
err..
Thread damage will occur if threads are crossed. Be sure the bolt can be
fully engaged with light manual torque.
N
No
otte
e:: S
Stta
attiio
on
na
arry
y cco
on
ntta
acctt iiss a
an
nn
ne
ea
alle
ed
d cco
op
pp
pe
err..
Thread damage will occur if threads are crossed. Be sure the bolt can be
fully engaged with light manual torque.
N
No
otte
e:: S
Stta
attiio
on
na
arry
y cco
on
ntta
acctt iiss a
an
nn
ne
ea
alle
ed
d cco
op
pp
pe
err..
Thread damage will occur if threads are crossed. Be sure the bolt can be
fully engaged with light manual torque.
