FIELD: high- voltage networks. SUBSTANCE: device for testing of voltages in multiphase network has first half-wave rectifier, fast-action current relay, threshold element, resistor, storage and capacitor. It was supplemented with current relays, storages signal light-emitting diodes, second rectifier, starting unit built on first and second relays. EFFECT: improved detection of faulty phase of network, increased sensitivity and speed of response. 4 dwg
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