PHASE-DIFFERENCE RELAY Russian patent published in 2003 - IPC

FIELD: electrical engineering; relays for adjusting generator input voltage to supply mains voltage. SUBSTANCE: relay that functions to produce error signal indicating difference in generator and supply mains phases as well as signal showing rate of change of phase difference has five comparators, pulse counter, two final elements, three AND gates, two adders, two subtraction units, short-pulse shaper, monostable multivibrator, delay circuit, OR gate, two nonrecursive filters, two bidirectional clippers, and clock generator. EFFECT: enlarged functional capabilities; enhanced noise immunity under abnormal noise and distortion conditions. 1 cl, 3 dwg