Air Circuit Breaker (ACB):
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| Panel 11 KV VCB type |
- Cleaning of breaker with
- Removal of old Grease and re-greasing the same with recommended grease
- Check condition of arcing contact and gap between fixed and moving arcing contracts shall be checked.
- Check condition of arcing contact and gap between fixed and moving arcing contracts shall be checked.
- Checking the reset mechanism, tripping of breaker through push button.
- Checking the reset mechanism, tripping of breaker through push button.
- Checking tripping of ACB through protection release.
- Checking presence and proper tightening of hardware.
- Checking presence of all cir clips.
- Checking condition and alignment of jaw contract with cradle terminals
- Checking condition of ACB wiring and replace if required.
- Checking and adjusting gap between hylam sheet and side plate.
- Checking proper closing of all poles together.
- Checking working of anti pumping device in case of
- Checking alignment of SIC and its operation.
- Checking scrapping earth alignment.
- Checking condition of arc chutes.
- Checking U/V release pickup and drop off.
- Checking ACB tripping through Shunt release.
- Checking motor operation in case of
- Checking closing coil operation in case of
- Checking continuity and proper changeover of aux contract block.
- Checking IR between phases – phase (ACB Closed condition).
- Checking IR between phases – earth (ACB closed Condition).
- Checking IR between phases – earth (ACB in open condition).
- Setting of release as per the load.
Vacuum Circuit Breaker (VCB):
- Cleaning of Vacuum Circuit Breaker with
- Removal of old grease and re-greasing the same with recommended grease
- Check condition of SIC Contacts
- Checking condition and alignment of jaw Contact
- Checking and proper tightening of hardware
- Checking proper closing of all poles together
- Checking of breaker tripping through push button
- Checking and adjusting gap between hylam sheet and side plate
- Checking motor operation in case of
- Checking of auxiliary contacts continuity proper change over
- Checking presence of all circlips
- Checking IR between phase – phase (VCB closed condition)
- Checking IR between phase – earth (VCB closed condition)
- Checking IR between phase – earth (VCB in Open condition)
- Any faculty spare replace by new one, which will be charged extra.
Oil Circuit Breaker (OCB):
- Cleaning of Oil Circuit Breaker with
- Removal of old grease and re-greasing the same with recommended grease
- Check condition of SIC Contacts
- Checking condition and alignment of jaw Contact
- Checking and proper tightening of hardware
- Checking proper closing of all poles together
- Checking of breaker tripping through push button
- Checking and adjusting gap between hylam sheet and side plate
- Checking motor operation in case of
- Checking of auxiliary contacts continuity proper change over
- Checking presence of all circlips
- Checking IR between phase – phase (OCB closed condition)
- Checking IR between phase – earth (OCB closed condition)
- Checking IR between phase – earth (OCB in Open condition)
- Any faculty spare replace by new one, which will be charged extra
- Cleaning of Panel Breaker with
- Check condition of Bus bars
- Checking condition and alignment of jaw Contact
- Checking and proper tightening of hardwares
- Checking of breaker tripping through push button
- Checking motor operation in case of
- Checking of auxiliary contacts continuity proper change overs
- Checking presence of all circlips
- Checking IR between phase – phase (ACB closed condition)
- Checking IR between phase – earth (ACB closed condition)
- Checking IR between phase – earth (ACB in Open condition)
- Checking of Contactor NO NC Point
- Checking of ad on block NO NC Point
- Checking of Control Wiring
- Checking of Thimble Tightness
- Checking of MCCB
- Checking o MCB
- Any faculty spare replace by new one, which will be charged extra.
Control Wiring: We do following during regular maintenance of Control Wiring
- Checking of All Control Wiring
- Checking of Contactor in NO/NC Point
- Checking of Glass Relay in NO/NC Point
- Checking of MCB Terminals
- Checking of RCCB Terminals
- Checking of Contactor Coil Resistance
- Checking of auxiliary Contact
- Checking of thimble of Terminals
- Checking of indicator of Panel
- Checking selectors switch in NO/NC Point
- Checking of TNC Switch in NO/NC Point
- Checking of Fuse Link Terminals
- Checking of Timer Relay Terminals
- Checking of Amp Meter Tightening at Terminals
- Checking of voltage meter Tightening at Terminals
