Electrical Breaker – Preventing Maintenance
Air Circuit Breaker (ACB)
Cleaning of breaker with CRC-226
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 EDO ACB.
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 EDO ACB.
Checking closing coil operation in case of EDO ACB.
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.
Note - After the inspection, the ACB shall be checked for proper termination by mv drop Test
Vacuum Circuit Breaker (VCB):
Cleaning of Vacuum Circuit Breaker with CRC-226
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 EDO.
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 CRC-226
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 EDO.
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
LT Panel (during regular maintenance of LT Panel)
Cleaning of Panel Breaker with CRC-226
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 EDO.
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 (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
