DIRECTED DETECTION OF RESISTIVE GROUND FAULT AND RUPTURE OF CONDUCTOR OF MEDIUM VOLTAGE

摘要

FIELD: electronic engineering.;SUBSTANCE: via reverse voltages, amplitude, etc, invention allows to diagnose and locate short-circuit in relation to performance of measurements. Device (100) includes at least one transformer substation (10) of medium voltage/low voltage, which determines transmission line (15) that consists of multiple phase wires (15_A, 15_B, 15_C) of low voltage, means for receiving voltage signal samples of each conductor of transmission line (15) of low voltage, means (110) for preparing samples of signals of phase voltages (V_AN, B_BN, V_CN) of received voltage signals, means (122) for determination of a symmetrical component of reverse voltage (V_i) of transmission line; means (126) for comparison of reverse voltage (V_i) with a threshold value (S_D) of actuation.;EFFECT: technical result is to ensure reliable detection of resistive earth fault and/or a wire break in medium-voltage power grid using information related to voltage in low-voltage system.;16 cl, 6 dwg