FIELD: electrical engineering. SUBSTANCE: differential-phase relay has four comparators, reversing counter, two final elements, two AND gates, adder, subtraction unit, two short-pulse shapers, monostable multivibrator, two delay circuits, OR gate, two nonrecursive filters, and clock generator. Differential-phase relay generates error signal indicating generator and supply mains phase difference and signal showing rate of phase difference variations. EFFECT: enlarged functional capabilities of relay. 3 cl, 3 dwg
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