ACB SERVICES
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.