FIELD: electricity.
SUBSTANCE: currents are measured in each phase from the side of an electric motor cutout terminals and zero terminals, the current values are compared between each two phases both from the side of the electric motor cutout terminals and the zero terminals, and when from the side of the cutout terminals for one phase the current value is less than current value for the other two phases in the modulus by n times, where n>1, and from the side of the zero terminals the current value in the same phase is more than the current values for the other two phases by m times, where m>1, then the signal is sent to switch off the motor cutout.
EFFECT: increased sensitivity to currents of the double-phase short circuit.
3 dwg
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