Method for determination of damaged feeder at earth fault in distributing mains

FIELD: electricity. SUBSTANCE: zero-sequence voltage samples at common buses and zero-phase sequence current samples in each feeder of the distributing mains are fixed with the preset sampling rate. The zero-sequence voltage samples are subject to analogue-to-digital conversion, then the converted voltage is delivered to the input of a zero-sequence model for each feeder at that models are made for the normal condition of the feeders. The zero-phase sequence current is subject to analogue-to-digital conversion for each feeder model with the preset sampling rate. Mismatch between the zero-phase sequence current for each actual feeder and current samples for each model is determined. The damaged feeder is determined against the mismatch value. EFFECT: improving selectivity. 4 cl, 6 dwg