METHOD MEASURING POWER OF DISTORTION IN A C SINGLE-PHASE NETWORK Russian patent published in 2004 - IPC

FIELD: control over quality indices of electric energy, distortion power meters. SUBSTANCE: method measuring power of distortion in A C single-phase network consists in measurement of momentary values of current and voltage, in multiplication of these values, in isolation of variable component of this product and in integration of obtained variable component beginning from moment of transition of voltage through zero and in the course of intervals equal to 1/4 period of input signals. Gross reactive power is found by formula , where Q_I,Q_II,Q_III,Q_IV are results of integration in first, second, third and fourth time interval of 1/4 period of supply voltage. At same time shift power is determined as area of volt-ampere characteristic described by momentary values of current and voltage and power of distortion is established by formula Q_d = Q_rp-Q_sp, where Q_d is power of distortion; Q_rp is gross reactive power; Q_sp is shift power. EFFECT: possibility of determination of power of distortion for nonsinusoidal conditions of single-phase network. 5 dwg, 1 tbl