remote control equipment - Indian Railways Institute of Electrical ...

1.1 Schedules
MAINTENANCE OF SF6 CIRCUIT BREAKERS
64
Annexure 3.06
The maintenance and check execution standard depends upon the working
conditions of the CB. The checks to be carried out. Their frequency and scope are
broadly as under:
Type of check Frequency Scope
Patrol
Inspection
Ordinary
inspection
Detailed
Inspection
Incidental
Inspection
1.2 General
Every week
After every
1000 operations
After every
3000 operations
The patrol inspection is an external check
of the circuit breaker in live conditions for
irregularities.
The ordinary inspection is inspection
Performed by turning off the circuit breaker
for a relatively short time for simple
inspection and servicing with emphasis on
functional checks e.g. visual check of
irregularities and cleaning of dust and dirt.
The detailed inspection is an inspection
performed by turning off the circuit breaker
for a relatively long time. To dismantle and
inspect the mechanism for irregularities for
the purpose of continuously maintaining the
performance.
____ The incidental inspection is performed
when inspection and repair are necessary
due to the detection of an irregularity during
patrol inspection.
Attention should be paid to the following points during ordinary and detailed inspection.
a) Switch off control/compressor motor supply. Discharge all the air in the air receiver
through the drain value.
b) The circuit breaker is to be inspected in the open position unless otherwise specified
in these Instructions. At the open position of the breaker the safety pins for preventing
closing and opening must be inserted. On completion of the safety pins must be removed.
c) Good quality grease should be used adequately.
d) Circlips and split pins which are removed must be replace with new ones.
e) Removed “O” rings must be replaced with new ones. While handling and placing “O”
rings in their grooves. Care should be taken to avoid dust falling on them.