Partial discharge behavior under operational and anomalous conditions in HVDC systems

M. Azizian Fard, M. Emad Farrag, S.G. McMeekin, A.J. Reid

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Abstract

Power cables undergo various types of overstressing conditions during their operation that influence the integrity of their insulation systems. This causes accelerated ageing and might lead to their premature failure in severe cases. This paper presents an investigation of the impacts of various dynamic electric fields produced by ripples, polarity reversal and transient switching impulses on partial discharge (PD) activity within solid dielectrics with the aim of considering such phenomena in high voltage direct current (HVDC) cable systems. Appropriate terminal voltages of a generic HVDC converter were reproduced – with different harmonic contaminations – and applied to the test samples. The effects of systematic operational polarity reversal and superimposed switching impulses with the possibility of transient polarity reversal were also studied in this investigation. The experimental results show that the PD is greatly affected by the dynamic changes of electric field represented by polarity reversal, ripples and switching. The findings of this study will assist in understanding the behaviour of PDs under HVDC conditions and would be of interest to asset managers considering the effects of such conditions on the insulation diagnostics.
Original languageEnglish
Pages (from-to)1494-1502
Number of pages9
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume24
Issue number3
Early online date29 Jun 2017
DOIs
Publication statusPublished - Jun 2017

Keywords

  • PD
  • HVDC
  • voltage measurement
  • harmonic analysis

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