FIELD: electrical engineering. SUBSTANCE: differential-frequency relay has input signal meter, multiplier, two comparators, two final elements, synchronized signal meter, algebraic adder, inverter, module separation unit, two AND gates, and two pulse shapers. Relay responds to relative frequency error in input and synchronized signals and is immune to short-time failure of generator frequency and high-frequency noise in its operation. EFFECT: enlarged functional capabilities and enhanced precision. 2 cl, 3 dwg
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