METHOD OF MEASURING ACTIVE POWER IN A THREE-PHASE SYMMETRICAL NETWORK Russian patent published in 2019 - IPC G01R21/06 G01R21/08 

FIELD: physics.

SUBSTANCE: invention relates to measurement of electrical quantities and can be used to determine active power in three-phase AC networks. Method of measuring active power in a three-phase symmetrical network consists in measuring current and voltage sensors operating on the Hall effect, instantaneous values of current and voltage at each phase, matching and bringing them to a standard form, and then obtained values of currents and voltages are simultaneously converted from three-phase coordinate system into two-phase orthogonal α-β coordinate system: where U_α, U_β – projections of stresses in α-β coordinate system; I_α, I_β – projections of currents in α-β coordinate system; I_A, I_B, I_C – instantaneous phase currents; U_A, U_B, U_C – instantaneous phase voltages; obtained projections of currents and voltages in coordinate system α-β multiplying I_α⋅U_α and I_β⋅U_β, then folded and multiplied by the number of phases: obtaining value of active power.

EFFECT: higher measurement accuracy and faster operation.

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