FIELD: electrical engineering. SUBSTANCE: device incorporating current transformer inserted in one of phase circuits of stator windings whose secondary winding is connected to selective amplifier, rectifier, relay member, and final element interconnected in series has, in addition, threshold element, pulse counter, and AND gate. Device recognizes asynchronous running by two parameters: amplitude and beat intervals of synchronous motor stator current. EFFECT: enlarged functional capabilities, improved reliability. 4 dwg
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