The simplest waveform capture triggering is based on RMS voltage or current changes. While sufficient for voltage sags, recloser operations, etc., more complex events such as cap bank switches, narrow voltage notches, and other waveshape distortions call for a more advanced trigger. The THD-based waveshape trigger, available in the Revolution and cell Guardian PQ recorders, provides this mechanism and is described here.
This Whitepaper Includes: