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I N S TA L L AT I O N , O P ER AT I O N S A N D M A I N T EN A N C E M A N UA L
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 lubricant. Before
lubricating, remove any hardened grease and dirt
from latch and bearing surfaces with mineral
spirits then wipe with a clean rag.
Caution:
All excess lubricant should be removed
with a clean cloth to avoid accumulation of dirt
or dust.
On draw-out breakers, the contact surface of
the disconnect fingers should be cleaned and
greased with lubricant.
Instruments, instrument transformers,
and relays
Check and inspect all devices to see that they are
functioning properly. Check that all electrical
connections are tight. 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 Relay
Instruction Books for detailed instructions.
Breaker compartment interiors
Warning:
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.
Thoroughly clean the interior of the 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. Check indicating devices,
mechanical and key interlocks. 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. Clean the racking mechanism
and lubricate with lubricant. Before replacing the
breaker, wipe off the primary disconnecting device
contacts. Apply a thin coat of lubricant to the
stationary studs and to the primary disconnects
on the breaker.
DANGER
WARNING
CAUTION
NOTICE
DANGER
WARNING
CAUTION
NOTICE
