FIELD: automation of power supply systems. SUBSTANCE: device has actuating member, unit for checking amplitude ratio, generators of pulses according to leading and trailing edges, unit for checking periods of current oscillations, loop counter, unit for initial signal settings, which implements given logical functions, unit for protection against short circuits, which locks device using speed of current amplitude fall, unit for directing power, which determines sign of relative slip. Actuating member is remote-controlled, logical functions of unit for initial signal settings are extended. Device prevents fault operations for liquidation of asynchronous mode when multiple short-circuits or external asynchronous mode are detected. EFFECT: increased functional capabilities, increased selective capacity, increased stability of operations. 2 cl, 3 dwg
