FIELD: electricity.
SUBSTANCE: method consists in measurement, to monitor integrity of circuits, of current and negative phase-sequence voltage, zero sequence voltage at windings of metering voltage transformers, connected as open delta, and at windings of metering voltage transformers, connected as star, fixation of damaged phases of the metering transformer in case of fault and detection of positive phase-sequence voltage by voltages of good phases.
EFFECT: increased reliability, in case of faults in circuits of metering voltage transformers of the main or reserve power supply sources.
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