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Thread: 2 Incomer :1 Buscoupler Power Control Center (PCC)

  1. #1

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    2 Incomer :1 Buscoupler Power Control Center (PCC)

    Dear All,

    Am facing a problem with 2 IC:1BC PCC which am unable to rectify Request Please help.

    1] Autochange over from BUS A is normal. (IC-1 trip on Undervoltage Buscoupler close).

    2] Autochange over from BUS B is normal (with only 2 Motor running).(IC-2 trip on Undervoltage Buscoupler close).

    3] If more than 3 Motors are running Bus transfer from IC-1 to BC is normal while
    IC-2 to BC is creating problem. Buscoupler close & open frequently. Please
    note UV in Motor relays are disable. None of the relays are registering any alarm
    or fault. SEL-751 is used for IC & BC Feeder Protection.

    4] I had checked the scheme , Relay Logic & Protections settings & found in line.
    5] Some ACB open on surges without any fault on relays.
    6] Am in opinion that Motor Residual Voltage is causing this problem but stuck up
    for the cause of BC tripping.Am attaching BC tripping scheme for your reference, There are two trip commands,
    a] K21 is BC relay & trip logic for same is 50P1T or 51P1T or 50N1T or 51N1T or G1T only.
    b] K27 is Master trip & hand reset. There is no other source for tripping.

    Any Suggestions.

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  3. #2

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    Pls upload control wiring of PMCC, then I suggest u……

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  5. #3

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    how to attach file here?

  6. #4

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    Hi Friend

    Please send the control circuit diagram to me on my email (smzakaullah@yahoo.com) and I will try to help you.

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  7. #5

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    Thanks Mr.Smzakaullah I had solved the problem.

  8. #6

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    Quote Originally Posted by raj151857 View Post
    Thanks Mr.Smzakaullah I had solved the problem.
    Hi raj151857,

    Can you share the diagram along with the solution.

    Thanks

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