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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

23 comments:

  1. LT panel- Elimination of old Oil and re-greasing the same with suggested grease, Examine situation of arcing get in touch with and gap between set and going arcing agreements shall be examined.

    ReplyDelete
  2. which is better vcb, acb or ocb and why?

    ReplyDelete
    Replies
    1. Thanx for reading. All is better. Application is different as per load.

      Delete
  3. Thanks for sharing it to helpfull us

    ReplyDelete
  4. want VCB parts in mumbai
    suggest me vendor

    ReplyDelete
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  6. Acb close and open standerd of it value

    ReplyDelete
  7. Nice Article. Thank you. Keep it going ahead. All the best.

    ReplyDelete
  8. You give such a nice information about LT panels
    .. It is too good to study for same subject.. Thanx

    ReplyDelete
  9. What are the Shutdown procedure of LV panel

    ReplyDelete
  10. thanks for sharing, your blog is really useful.

    ReplyDelete
  11. Thanks for valuable information and yr blog is most important

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  16. Thank You sir for sharing information...

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