With reactive power, apparent power, and other formulas, what’s the difference between TYPE1 and TYPE2?
Selecting formulas for calculating apparent power and reactive power There are several types of power—active power, reactive power, and apparent power. Generally, the following equations are satisfied: Active power P = UIcosθ (1) Reactive power Q = UIsinθ (2) Apparent power S = UI (3) In addition, these power values are related to each other as follows: (Apparent power S)2 = (Active power P)2 + (Reactive power Q)2 (4) U: Voltage RMS I: Current RMS θ: Phase between current and voltage Three-phase power is the sum of the power values in the individual phases. These defining equations are only valid for sinewaves. In recent years, there has been an increase in measurements of distorted waveforms, and users are measuring sinewave signals less frequently. Distorted waveform measurements provide different measurement values for apparent power and reactive power depending on which of the above defining equations is selected. In addition, because there is no defining equation for power in a di
