FIELD: electrified transport power supply systems. SUBSTANCE: device has transducer measuring total current of contact system feeders in particular power circuit and voltage sensor in first substation. There are transducer measuring total current of contact system feeders in same circuit and voltage sensor in second substation, as well as first adder and recording unit. According to first alternative, device has current sensor for faulty contact system and multifunction phase angle converter, adders, and also first, second, third, fourth, and fifth multifunction converters and function converter. According to second alternative, it has in addition sixth multifunction converter and second recording unit for locating ground fault. EFFECT: enhanced precision of ground fault detection. 2 cl, 4 dwg
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