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  1. juanccga

    Voltage impedance

    hI, You must energize the transformer by HV side by a regulated souerce, and LV is in short. The current in the short must be at least 25 % of Irated. You must read the aplied phase-phase voltage (V Vtest) and the aplied current in the HV side (Itest) so, Zcc = Vcc = Vtest / Vrated x...
  2. juanccga

    TRANSFORMER POWER FACTOR TEST

    Hi pwrengrds, thanks for your answer The transformer is in oil, in HV there are three clean bushings and in LV there are no bushings, the terminals of LV are a few slides (platens) that go out across a bakelite, the transformer was outdoor during three years and and I belive that is moisture...
  3. juanccga

    TRANSFORMER POWER FACTOR TEST

    Good day. I have an arc transformer (42 MVA, 13,2 kV / 557 V). The high voltage winding in near the core and the low volgate winding is over it. 3 years ago the power factor was: 1. AT 0,59 AT VS EARTH + AT VS BT 2. AT GST 0,63 AT VS EARTH 3. AT-BT (UST) 0,56 AT VS BT 4. BT...
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