FIELD: electricity.
SUBSTANCE: device comprises a unit of power direction, a start-up unit of minimum frequency, the first and second logical AND units, the first and second timers, a minimum voltage control unit, a minimum current control unit, a logical OR unit and an actuating unit. The proposed device is designed for installation in cells of switchgears of transformer substations supplying to large synchronous electric motors with a frequency control of a rotation speed.
EFFECT: higher reliability and resistance of process systems as a result of faster protection action and reduced idle time of process units.
1 dwg
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