Some more data on this.
1) The transformer was isolated for this testing
2) The test set in use was a Doble M4000 (note that this tests at frequencies just above and below nominal of 60Hz)
3)The transformer was tested in Nov of 2010. During this time slightly elevated power factor test results...
While testing a 200 MVA, 345 / 18 kV, delta wye generator step up transformer, "poor" power factor test results were noted in the CL tests at 10 kV. The tests were repeated at lower test voltages and the power facor results were worse. Does anyone have any theories on the cause? A summary of...
