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

3.9.7 Control and Relay Panels
1 . Carry out maintenance on relays as detailed in para 3.3.7
2. Check and dean up control switches and push-button contacts for burnt
or corroded marks; polish the surfaces. Check also if the contact
springs have the correct springiness.
3.9.8. Batteries and Battery Chargers
If the battery is not in a healthy condition or if there is excessive accumulation
of sediment, the whole battery should be replaced with a new set.
Battery Charger
Open out the covers of the battery charge and blowout all dust. Check
tightness of all connections, bolts, nuts and screws. Measure and record the
insulation resistance of the transformer windings of the batten,' charger with 500 V
megger.
3.9.9. PTs and CTs
1. Test oil samples if possible.
2. Check rod gap setting, if provided.
3. Measure insulation resistance.
4. Check conditions of fuses of PTs and terminal connections for CTs.
3.9.10. Special maintenance Schedule for SF6 Circuit Breakers and
Interrupters
Before staring maintenance of any switchgears ensure that the instruction
manual of the equipment issued by the manufacturer have been fully studied and full
knowledge of the working of switchgears is available with the maintenance
personnel. Otherwise there may be adverse effect on the performance of
switchgears and it may also endanger the safety of working personnel.
The periodicity of maintenance is:
i) Fortnightly
ii) Quarterly
iii) Annually
iv) Three yearly
v) Eight yearly
vi) Ten yearly
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