Comparison between RF and electrical signals from the partial discharge activity of twisted pair cables at reduced pressures

M Given, Ronald Mason, Martin Judd, Phillip Mcglone, Igor Timoshkin, Mark Wilson

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A pressure-controlled test facility has been set up that allows the PD behaviour of polymer insulated twisted pair samples exposed to 50 Hz AC voltages in the range of 0 to 10 kV to be characterised. Resulting PD activity is quantified using the methods defined in IEC standard 60270 and by using a simple monopole antenna to detect the RF signals excited inside the pressure vessel by the discharges. This paper gives the results of preliminary tests performed on samples of wire insulated with Ethylenetetraflourethylene, Silicon Rubber and Polyvinylchloride in the pressure range between 103 and 105 Pa in atmospheric air. The dependence of PD inception voltage on the environmental pressure is reported. Changes in the behaviour of the PD activity; the correlations between the RF and electrical measurements and the frequency components of the RF signals as the applied voltage and pressure are varied are characterised and discussed.
Original languageEnglish
Number of pages4
Publication statusUnpublished - Oct 2011
Event2011 IEEE Electrical Insulation and Dielectric Phenomena (CEIDP) - Cancun, Mexico
Duration: 16 Oct 201119 Oct 2011


Conference2011 IEEE Electrical Insulation and Dielectric Phenomena (CEIDP)


  • pressure-controlled test facility
  • PD behaviour
  • RF signals
  • ethylenetetraflourethylene
  • silicon rubber
  • polyvinylchloride
  • electrical measurement

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