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Comprehensive Formulas for Accurate Power and Harmonic Measurements
This white paper details the mathematical algorithms used by PMI recorders to calculate RMS voltage and current, real, reactive, and apparent power, power factor, phase angle, total harmonic distortion (THD), and harmonic magnitudes and phases across various circuit configurations. The document provides explicit formulas and methodologies for single-phase, three-phase wye, delta, and 2.5 element wye circuits, ensuring precise measurement and analysis of electrical parameters.
Key topics include:
- Notation and Sampled Data
- Independent Channels/Single Phase
- Three Phase Wye
- Three Wire Delta; Four Wire Delta
- 2.5 Element Wye
Why utilities should care:
Accurate measurement and analysis of power quality parameters enable improved system reliability, optimized asset performance, and compliance with regulatory standards. Understanding these formulas supports effective monitoring, troubleshooting, and operational decision-making.
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