FIELD: technology for determining ground contact branch line in electric networks with isolated neutral.
SUBSTANCE: method includes registration of zero series voltage on buses of low volt voltage output force transformer, on appearance of zero series voltage, one of phases of low voltage buses is connected to ground through current-limiting resistor, and if in the moment when this phase is enabled no current flows through current-limiting resistance, then this phase is disabled and any other one is connected to ground through current-limiting resistor, while simultaneously with it appearance of short circuit ground current is controlled in one of branch lines, when it appears, subject line is assumed to be in contact with ground.
EFFECT: increased reliability of power provision to consumers when determining line with ground contact, by means of excluding unfounded disabling of other lines without ground contact.
1 dwg
