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: