Wavelet transform based relay algorithm for the detection of stochastic high impedance faults

T. M. Lai, L. A. Snider, Wai Chau Edward Lo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)


High impedance faults (HIF) are faults which are difficult to detect by overcurrent protection relays. This paper presents a practical pattern recognition based algorithm for electric distribution high impedance fault detection. The scheme recognizes the distortion of the voltage and current waveforms caused by the arcs usually associated with HIF. The analysis using discrete wavelet transform (DWT) yields three phase voltage and current in the low frequency range which fed to a classifier for pattern recognition. The classifier is based on the algorithm using nearest neighbour rule approach. A HIF model was also developed, where the random nature of the arc was simulated using MATLAB.
Original languageEnglish
Pages (from-to)626-633
Number of pages8
JournalElectric Power Systems Research
Issue number8
Publication statusPublished - 1 May 2006


  • High impedance faults
  • Pattern recognition
  • Wavelet transform

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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