FIELD: electrical power engineering.
SUBSTANCE: method can be used for finding feeder with single-phase arc fault to ground in radial distribution cable circuits of 6-10 kV having isolated and resonant-compensated neutral conductor or with neutral conductor earthed through high-ohmic resistor. Transient voltages at buses of main point are registered in single-phase shorting as well as first half-waves of transient currents in feeders coming from the buses. Polarities of currents are juxtaposed. Feeder having current polarity being opposite to the others is supposed to be damaged. In this case shorting mode is recognized on the base of analysis of phase voltages at buses of main supply point. After that the polarities of first half-waves of transient currents being registered in conductors connecting envelopes of cables with grounding mat have to be compared.
EFFECT: improved reliability.
4 dwg
