FIELD: electrical engineering, relay for synchronization of generator while connected to network. SUBSTANCE: technical result of invention consists in increased accuracy of operation since effect of short-time frequency error of generator and of high-frequency interference on operation of relay is excluded thanks to averaging of evaluations of signal of frequency beats and of first and second derivatives and exclusion of anomalous distortions of signal. Synchronization relay incorporates measurement converter, adder, comparator, actuating element and three units for averaging and formation of difference signal. EFFECT: increased operational accuracy of synchronization relay. 2 dwg
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