SecoGear – Installation, Operation and Maintenance Manual 47 of 56
Switchgear Interior
1. Thoroughly clean the interior of the circuit breaker and
instrument compartments. Use a vacuum cleaner and clean
rags only. Do not use steel wool or oxide papers. Blowing
with compressed air is not recommended.
2. Check indicating devices, mechanical and key interlocks.
3. Check primary disconnecting device contacts for signs of
abnormal wear or overheating. Discoloration of the silvered
surfaces is not ordinarily harmful. These contacts should be
cleaned only by wiping with a lint-free cloth.
4. Clean the racking mechanism and lubricate with GE
lubricant D6A15A2.
Before replacing the circuit breaker, wipe off the primary
disconnecting device contacts. Apply a thin coat of
GE lubricant D6A15A2 to the stationary studs and to
the primary disconnects on the circuit breaker.
2. Electrically operate the circuit breaker several times to check
performance of the electrical accessories.
3. Visually check for loose hardware on the circuit breaker; also,
check the bottom of the compartment for any hardware that
has fallen from the circuit breaker.
4. Check insulating parts for evidence of overheating and for
cracks that indicate excessive thermal aging.
Refer to Publication#DEH-50001 SecoVac Vacuum Circuit
Breaker Installation Manual for detailed maintenance
instructions and replacement of parts.
Lubrication
In general, the circuit breaker requires moderate
lubrication. Bearing points and sliding surfaces should be
lubricated at the regular inspection periods with a thin
film of GE lubricant D6A15A2. Before lubricating, remove
any hardened grease and dirt from latch and bearing
surfaces with mineral spirits, then wipe with a clean rag.
The contact surface of the disconnect fingers should be
cleaned and greased with GE lubricant D6A15A2.
Instruments, Components and Relays
1. Check and inspect all devices to see that they are
functioning properly.
2. Check that all electrical connections are tight.
3. Check mounting of the device.
Under normal conditions, the protective relays do not
operate; therefore, it is important to check the operation
of these devices regularly. Refer to the Relay manual for
detailed instructions.
Remove all excess lubricant with a clean cloth to avoid
accumulation of dirt or dust.
CAUTION
De-energize equipment completely before doing
maintenance work in compartments. This includes
de-energizing any connections to outside primary or
secondary sources, such as transformers, tie lines, etc.
WARNING
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