Pitfalls of electric power quality indices

G. T. Heydt, W. T. Jewell

Research output: Contribution to journalArticlepeer-review

92 Scopus citations


Several indices are in common use for the quantification of electric power quality. These indices are convenient for condensing complex time and frequency domain waveform phenomena into a number. However, a variety of commonly encountered circumstances are not readily accommodated (for example: quasiperiodic and aperiodic signal components, noninteger multiples of the power frequency). Also, the power acceptability curves have been used as convenient measures of power quality and these curves do not capture three phase detail of power quality problems. In this paper, the general subject of pitfalls of power quality indices is discussed and suggestions for alleviating problems are made.

Original languageEnglish (US)
Pages (from-to)570-576
Number of pages7
JournalIEEE Transactions on Power Delivery
Issue number2
StatePublished - 1998


  • Displacement factor
  • Flicker
  • Harmonics
  • Noise
  • Power acceptability curves
  • Power factor
  • Power quality
  • Total harmonic distortion

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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