Air Circuit Breakers (ACB).
Air Circuit Breaker (ACB) : We do following during regular maintenance of 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).
- Checking of release by secondary injection for 01. S/C, E/F.
- Setting of release as per the load.
- Checking the healthiness of CTs.
- After the inspection, the ACB shall be checked for proper termination by mv drop Test.
