FIELD: electricity.
SUBSTANCE: device comprising current sensors, a comparator with a threshold level setter, a contactor unit with contacts in a power supply circuit of an electric motor is equipped with two rectification and highest voltage release units, a differential amplifier and an analogue voltage divider. At the same time each of rectification and highest voltage release units is made on three operational amplifiers with diode-resistive feedbacks, and outputs of rectified voltage of one of polarities are combined and connected with the output of the highest voltage of the unit.
EFFECT: realisation of a simple and universal device to monitor good condition and protection of a three-phase electric motor characterised by simple design, low cost, small size and weight, and high reliability.
3 cl, 1 dwg
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