FIELD: electricity.
SUBSTANCE: according to the method of switching off the power supply from the load of the consumer, a control signal is sent to the windings of the independent releases of circuit breakers. As the control signal for each release, the phase voltage of the corresponding source of power supply is used, disconnected by the trip unit. Until the power sources are disconnected, continuous monitoring of the presence of current in the circuit of the series-connected windings of the independent releases is carried out. The control is realized by the fact that a monitoring signal is generated in this circuit, which is formed on the output winding of the transformer by feeding into its input the alternately connected windings of alternating current signals whose phases have a shift of 120º relative to each other.
EFFECT: increasing the reliability and simplification of disconnection of power supply sources from load.
2 cl, 1 dwg
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