Power distribution network single-phase arc grounding fault line selection method based on sampling value method

• Main Authors: CHEN SHIJUN, SONG QIANG, DENG TIAN, WU BO, FANG TAO, TENG SONG, YANG BO, WANG ZIYI, CUI CHENGYAO, CHEN KUI, CHEN XINGYU, WANG YAN
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2020
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a power distribution network single-phase arc grounding fault line selection method based on a sampling value method. The method comprises the following steps of: taking the sum of first 1/4 cyclic waves of zero-sequence current sampling values of all feeder lines as an amplitude initial criterion of the feeder lines when a single-phase grounding fault occurs, carrying outnormalization processing, and then calculating an amplitude criterion; calculating the product of the amplitude initial criterions of each feeder line and other feeder lines, and when the product is smaller than a threshold value, adding 1 to the phase criterion, otherwise, keeping the phase criterion unchanged; if the faulty feeder line judged by the amplitude criterion is consistent with the faulty feeder line judged by the phase criterion, determining the feeder line as a faulty feeder line; and if the faulty feeder line judged by the amplitude criterion is inconsistent with the faulty feeder line judged by the pha