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Voltage Notching Effects on Harmonic Distortion

Category: Analyzing Waveforms, PQ Theory, Harmonics/Interharmonics, PQ Data Analysis, IEEE Standards

Help your utility and gain a better understanding of the voltage notching phenomenon.


Notching is a voltage waveform distortion resulting from short-duration high current pulses.  These distortions typically present themselves graphically as a “notch” in the time domain representation of the waveform.


The IEEE 519-2014 standard, which deals with harmonics includes an appendix (IEEE Std 519, Appendix C) that provides a table of maximum notch depth (measured as a percentage of measured voltage) and notch area.


This whitepaper is going to discuss some notching scenarios and will present some measurements and calculations for helping a utility better understand this phenomenon.


This white paper includes:

  • IEEE 519
  • Observations
  • Interpretations
  • Harmonic Composition
  • Not a Traditional Harmonics Issue
  • Detecting Waveform Notching

Download White Paper Here