FIELD: electricity.
SUBSTANCE: device comprises a facility (70) to determine a value of neutral overall conductivity in the three-line electrical line (30) and facility (70) to detect ground short-circuit in the three-line electrical line (30) against the determined value of neutral overall conductivity and values of one or more preset parameters. The facility (70) comprises a unit to convert the determined neutral overall conductivity from the area of neutral overall conductivity to the area of residual current, a unit to compare in the area of residual current of the converted value of neutral overall conductivity with one or more preset parameters and a unit to detect ground short-circuit based on the comparison.
EFFECT: higher accuracy of detection.
16 cl, 12 dwg
