POWER DIRECTIVITY RELAY Russian patent published in 2002 - IPC

FIELD: electrical engineering. SUBSTANCE: power directivity relay has intermediate converter of voltage level with phase-shifting unit which input is input for connection of tested voltage, intermediate current-to-voltage converter which input is meant for connection of tested current, adder, threshold unit and actuating element connected in series as well as two series networks. Each network incorporates analog-to-digital converter, nonrecursive filter and zero level comparator connected in series. Inputs of analog-to-digital converters of first and second series networks are connected to outputs of intermediate converter of voltage level with phase- shifting unit and intermediate current-to-voltage converter correspondingly. Outputs " greater than " of zero level comparators of first and second series networks are connected to second inputs of first and second AND gates correspondingly, outputs " less than " of zero level comparators of first and second series networks are connected to first inputs of first and second AND gates correspondingly, outputs of first and second AND gates are connected to switchingover inputs of directivity of counting of first and second reversible counters correspondingly which counting inputs are connected to output of clock pulse generator. Outputs of first and second reversible counters are connected to proper inputs of adder. EFFECT: enhanced functional accuracy of relay. 1 cl, 2 dwg