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PowlVac® ASD 27kV & 38kV Vacuum Circuit Breaker
IB-65100
Recommended Renewal Parts and Replacement Procedures
iv. If the gap needs to be decreased,
hold the high voltage regulator (13)
with channel lock pliers, loosen the
hex head nut (46) and turn the high
voltage regulator disc (13) to the
right. Retighten the hex head nut
(46) and measure the gap again.
2) Closing Coil Assembly
This assembly is located center and below
the circuit breaker mechanism (Figure 7, o).
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Perform the following steps to replace the
closing coil assembly:
a. Remove the front cover of the circuit
breaker.
b. Elevate the circuit breaker so that there
is at least 6 inches of clear space below
the base pan of the breaker.
c. Disconnect the closing coil assembly
from the wire harness.
d. Remove the two bolts which hold the
assembly to the circuit breaker base
pan, and lower the assembly out of the
bottom of the circuit breaker.
e. Insert the new assembly into the circuit
breaker from below and bolt it in place.
Reconnect the assembly to the wiring
harness. No adjustment is required.
f. Close the circuit breaker several times
electrically to ensure that the closing
coil assembly is functioning properly.
g. Replace the front cover.
3) Primary Shunt Trip Coil Assembly
This assembly (Figure 7, a) is located in the
center part of the mechanism area, just left
of the main closing spring.
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Perform the following steps to replace the
primary shunt trip coil assembly:
a. Remove the front cover of the circuit
breaker.
b. Remove the two bolts which hold the
primary shunt trip coil assembly to the
circuit breaker frame and remove the
assembly.
c. Bolt the new primary shunt trip coil
assembly in place and reconnect it to
the wiring harness.
d. Perform the Tripping System
Adjustment found in
Ch 5 Maintenance
,
B. M
ECHANISM
A
REA
,
5) Mechanism
Adjustments,
c. Tripping System
Adjustment
.
e. Trip the circuit breaker electrically
several times to ensure that the primary
shunt trip coil assembly is functioning
properly.
g. Replace the front cover.
