FIELD: ground detecting and protective devices for installations such as ice-melting rectifier units of overhead power transmission lines. SUBSTANCE: device has final element in the form of two parallel-connected relays with unequal-polarity diodes; one lead of final element is connected to ground (grounding device) and other lead is connected through non-breaking change-over contact in turn to first and second intermediate leads of resistive voltage divider inserted between electrical installation poles. EFFECT: provision for ground protection without dead zone. 2 cl, 1 dwg
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