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

d) Measure the IR between auxiliary control and motor circuit The value
shall be min. 2 Mega Ohm with 500 V megger.
e) Measure the IR between open contacts and earth The min . value shall
be 1,000 M Ohm with 2.5 kV. megger.
f) Check the charging time of compressor from 0 to 15 kg/cm 2 for
pneumatic operating mechanism It should be less than 35 minutes.
g) Check the gap of closing and trip coil assembly as per instruction
manual.
h) Check the oil leakage from shock absorber. If leaking replaces the
same,
i) Check free movement of various latches in operating mechanism,
j) Check compressor oil condition and its level Change the oil in case it
has turned yellow.
k) Check V - belt for its tension and soundness.
Three Yearly Schedule :
During Three Yearly maintenance, following items shall be attended/ Checked
over and above the items covered in Annual and Quarterly Maintenance:
a) Measure the mechanical travels as per instruction manual and adjust if
required.
b) Replace the door gasket of the operating mechanism with new one.
c) Measure the value of contact resistance of pole between upper
terminal and lower terminal If value is more than 120% of the design
value specified in maintenance manual. Approach the manufacturer for
rectification.
d) Check the movement of 'C'& 'D ’ rollers for its free movement If not free
change the same (for M/s. CGL make CB)
Eight Yearly Schedule :
The following items shall be checked /attended (without dismantling the C.B./
Interrupter) if circuit breaker has completed 08 years of service or 2000 electrical
switching operations or 5000 mechanical co-operations. In case of interrupter,
following items shall be attended if it has completed 08 years of service or 5000
Electrical / Mechanical co-operation. This schedule can be categorized for its two
parts separately, i.e. operating mechanism system and interrupting pole unit.
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