PHASE SHIFTING RELAY Russian patent published in 1995 - IPC

FIELD: relay protection. SUBSTANCE: device has two units 1 and 2 which serves for generation of values for comparison, outputs of these units are connected to input of phase comparison unit 3. In addition device has setting adjustment unit 4 having n circuits of resistors and switching elements. In addition device has accumulating adder, comparator and final control unit which are connected in parallel. device us supplied from two-pole power supply. Setting adjustment unit 4 has circuit of resistor which is connected to first output of power supply. This output has the same polarity as signal at output of phase comparison unit when polarity of signals at its input does not match. Setting adjustment unit 4 also has circuit that has resistor and switching element which are connected in series. This circuit is connected to second output of power supply. Another terminals of these two circuits of setting adjustment unit are connected to first input of accumulating adder, another input of accumulating adder is connected to output of phase comparison unit. EFFECT: increased functional capabilities. 3 dwg