FREQUENCY DIFFERENCE RELAY Russian patent published in 2003 - IPC

FIELD: electrical engineering; generator voltage adjustment to supply mains. SUBSTANCE: frequency difference relay has first rectifier unit whose input functions as generator voltage input, second rectifier unit whose input functions as supply mains voltage input, two algebraic adders, two rectifier units, five comparators, four AND gates, two pulse shapers, two rectifier units, OR gate, counter, shift register, averaging filter, clock generator, and trailing edge shaper. EFFECT: enlarged functional capabilities. 4 cl, 2 dwg