Power transformer monitoring using UHF sensors: site trials

M.D. Judd, G.P. Cleary, C.J. Bennoch, J.S. Pearson, T. Breckenridge

Research output: Contribution to conferencePaper

24 Citations (Scopus)


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.
Original languageEnglish
Number of pages5
Publication statusPublished - Apr 2002
Event2002 IEEE International Symposium on Electrical Insulation - Boston, United States
Duration: 7 Apr 200210 Apr 2002


Conference2002 IEEE International Symposium on Electrical Insulation
Country/TerritoryUnited States


  • power transformer
  • monitoring
  • uhf sensors
  • site trials
  • fault location
  • testing
  • test equipment
  • signal analysis
  • power transformers
  • phase measurement
  • oil insulation
  • information analysis
  • frequency


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