FIELD: electrical measurement technology. SUBSTANCE: instantaneous current and instantaneous voltage are simultaneously measured three times at equally spaced moments of time. Interval between the measurements is determined from the relationship given in the specification. Values of active P and reactive Q power are calculated by expressions given in the specification. Device has voltage and current digitizers 1, 2, multiplexer 3, computing unit 4, control unit 5, standard frequency generator 6, gate 7, counter 8, code comparison circuit 9, and shift register 10. EFFECT: increased speed of response. 2 cl, 3 dwg
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