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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.


    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.


      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.