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Transformer gauge at -7.6 PSI - causes?

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    Transformer gauge at -7.6 PSI - causes?

    I have a 2500 KVA transformer, 12,470 V to 480 V Delta to Wye which was showing a negative 4 PSI vacuum with the guage needle bouncing noticeably. It is now showing negative 7.6 PSI.

    The temperature has warmed up and the pressure should have gone closer to 0 rather than further to the negative.

    I am concerned there may be a leak which could contaminate the oil in the tank. If there was a leak the pressure should have gone closer to 0.

    The transformer is operating at approximately 2800 Amps and the maximum Amps is 3008 so 93%. Outside temperature was plus 8 C.

    Are there any thoughts on this situation our there?

    Any information would be appreciated.

    Brian

    #2
    defective gauge?

    "with the guage needle bouncing noticeably" doesn't seem all that possible for actual pressure to do.
    I live for today, I'm just a day behind.

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      #3
      oil testing

      I think that could be arcing in the tank that's causing oxygen depletion and a corresponding vacuum.
      I recommend you have the oil tested as soon as possible.

      Comment

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