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Power transformer monitoring using UHF sensors : site trials

Judd, M.D. and Cleary, G.P. and Bennoch, C.J. and Pearson, J.S. and Breckenridge, T. (2002) Power transformer monitoring using UHF sensors : site trials. In: 2002 IEEE International Symposium on Electrical Insulation, 2002-04-07 - 2002-04-10.

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Sensors operating in the ultra-high frequency (UHF) band have been used to detect internal discharges during site testing of a 1000 MVA oil-filled transformer. The transformer was operated at voltages exceeding normal levels by up to 15%. Two discharge sources were detected at both sensors using UHF test equipment. Discharge signals are analyzed in phase-resolved form and time-of-flight measurements are used to provide further information regarding their origin. The results indicate that the URF method could prove very effective for transformer testing and on-line PD monitoring.