Wavelet analysis based protection for high impedance ground fault in supply systems

Xiangjun Zeng, K. K. Li, Wai Lok Chan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

4 Citations (Scopus)


Many high impedance ground faults (HIGF) that happen in a low voltage (LV) system often cause loss of customer supply, fire and human safety hazards. Traditional ground fault protection is provided by residual current circuit breaker (RCCB). The RCCB often causes nuisance tripping and it is difficult to detect HIGF. Wavelet analysis based HIGF protection is developed in the paper. The wavelet transform is applied to filter out some frequency bands of harmonics from residual current and line current. The root mean square (RMS) value of harmonics are calculated using their wavelet coefficients directly. HIGF is identified from disturbance by the RMS difference between the residual current and the line current. The digital protection scheme is designed. EMTP simulation results show that the new protection is able to detect HIGF and prevent electric shock with high sensitivity and robustness.
Original languageEnglish
Title of host publicationPowerCon 2002 - 2002 International Conference on Power System Technology, Proceedings
Number of pages5
ISBN (Electronic)0780374592, 9780780374591
Publication statusPublished - 1 Jan 2002
EventInternational Conference on Power System Technology, PowerCon 2002 - Kunming, China
Duration: 13 Oct 200217 Oct 2002


ConferenceInternational Conference on Power System Technology, PowerCon 2002


  • Ground fault Protection
  • High impedance fault
  • Low voltage systems
  • Wavelet analysis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment


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