DEVICE FOR PHASE COMPARISON Russian patent published in 1997 - IPC

FIELD: electric engineering, in particular, relay protection and automation of power systems. SUBSTANCE: state-of-the-art device has unit 1 which generates rectangular pulses for signals to be compared and has two generators 2, 3 which inputs and outputs serve as inputs and outputs of unit, two majority gates 4 and 5 which have feedback circuit for first inputs and are joined with second and third inputs of same name. One input is inverse. Joined inputs are connected in pairs to outputs of unit which generates rectangular pulses. Four-input XOR gate 6 which inputs are connected in pairs to outputs of generation unit and majority elements and output is connected to device output is introduced. In addition two majority gates 7 and 8 which are identical to above-mentioned ones are introduced to unit which generates rectangular pulses. Their second and third inputs are joined and are connected to outputs of generators of unit. Their outputs are connected to output of unit. EFFECT: increased functional capabilities. 2 cl, 2 dwg