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Procedure to isolate 400KV Electrical Power Transmission line from system

Following Procedure should be done:-

1) Requisition form for 400Kv Line Clear Permit duly signed by maintenance engineer should be obtained.

2) Ensure that outage of the proposed line is confirmed.

3) Inform opposite end of the 400Kv transmission line and all other concern  before switching OFF breaker.

4) First switch off load end breaker & than Source end breaker of 400Kv Transmission line.

5) Check the Lamp Indication, semaphore for opening of breaker.

6) Check Current transformer relay switching and Potential transformer switching Relay.

7) In Substation Yard just check that all the three poles are opened.

8) Always use Hand gloves for opening and closing Isolator/Earth switch.

9) Open bus & line Isolator from both ends.

10) After confirming opening of isolators at both ends, provide Earthing at both the ends.

11) While providing Local Earthing, Connect Earth wire to the Earthing strip first & then Connect earthing Rod to the Equipment.

12) Ones Bus & Line Isolators open, Earthing provided than Line clear permit of 400Kv Transmission Line can be issue to maintenance engineer.

13) Necessary entries should be made in Line clear permit Book.

14) “Line Clear Permit issued & Mean at work” board should be hanged on the control panel & in Yard.

15) Isolated Bay should be cordoned with the help of Rope for safety measures.

Above mentioned Procedure should be done for Isolating 400KV Electrical Power Transmission line from system.

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