FIELD: electrical engineering. SUBSTANCE: voltage emerges between neutral point of protected phase and common wire with break of any phase. It is converted by former of operational signal manufactured in the form of single-phase rectifier into fade-out voltage. Then signals are summed up in integrating stage. Resulting voltage is supplied to final-control element which operates when resulting voltage exceeds the preset value and disconnects protected load. EFFECT: enhanced efficiency and reliability of protection. 1 dwg
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