FIELD: facilities protecting electric installation in single- and three-phase networks with insulated neutral. SUBSTANCE: device includes network generator, measurement network comprising parametric stabilizer, second three-phase rectifier formed by diodes, high-resistance bridge, two voltage rectifiers, two filters, voltage divider and comparator. Diodes of second and anodes of first three-phase rectifiers are connected to each phase of network. EFFECT: increased sensitivity and operational stability of device. 2 cl, 1 dwg, 1 tbl
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