FREQUENCY CONTROL RELAY Russian patent published in 2004 - IPC

FIELD: electrical engineering; generator frequency control when throwing it on line.

SUBSTANCE: relay has two comparators, pulse generator, four AND gates, frequency discriminator, three short-pulse leading-edge shapers, and monostable multivibrator; outputs of first and fourth AND gates function as control outputs for reducing and raising generator frequency, respectively; output of third AND gate is used as enable signal output for throwing generator on line.

EFFECT: enhanced operating precision of relay.

1 cl, 1 dwg