DEVICE OF SELECTIVE SIGNALING OF INSULATION RESISTANCE REDUCTION IN CABLE NETWORK WITH INSULATED NEUTRAL OF 0,4 kV FOR ESSENTIAL SERVICES

摘要

FIELD: electricity. ^ SUBSTANCE: device consists of network generator, DC insulation resistance control unit connected between generator neutral wire and ground, related data transmission lines for leak current control unit made in the form of zero-phase sequence current transformers and data measurement and coding units connected in series with each network section and loads; between generator neutral wire and ground there is also capacitor which is switched on for short period (in case of network damage) and connected to the ground by contacts of insulation resistance control unit. ^ EFFECT: improvement of signaling device sensitivity and selectivity, improvement of power supply reliability. ^ 2 cl, 1 dwg, 1 tbl