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  1. Chrislatimer

    De-oiled transformer tests

    Hi, I have been asked to test a transformer (33kV:11 kV 22.5 MVA star-delta unit) which recently suffered a fault condition. the unit has had its oil removed, another party has performed visual inspections. I am wondering what tests are recommended to avoid on a transformer with no oil. Tests to...
  2. Chrislatimer

    VT primary winding resistance

    I have recently tested a 132 kV:110 V, 50(300) VA, Class 0.5M(1M) Trench German GmbH voltage transformer. I obtained a primary winding resistance in the order of 10+ KOhms. A collegue tested an identical unit and came to a value of 40 mOhm.I have tried to locate information on calculations or...

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