Wednesday 12 December 2012

Check list ACB, VCB, OCB, LT PANEL

Air Circuit Breaker (ACB): 
Panel 11 KV VCB type

  • 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.
 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: We do following 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: 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

Saturday 8 December 2012

Bibliography for BRALPOWERASSOCIATE


Hi friends!!!!
Bhagwan Prasad


The below is the references for article written on blog http://bralpowerassociate.blogspot.com

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Mech Engg hand book
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74

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