Single-phase earth fault line selection method of power grid with neutral point earthed via arc suppression coil, device and readable storage medium

• Main Authors: ZHOU QING, LU FENG, JI YOU, HAN LIYE, ZHANG HAO, GAO CHAO, GONG MAOGUO, LIU ZHAOXIA, ZHANG JUNLIANG, CHEN ZHIHUI, BI JINGGUO, WANG WEILIANG, YU JIE
• Format: Patent
• Language: Chinese; English
• Published: 29.11.2019
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a single-phase earth fault line selection method of a power grid with a neutral point earthed via an arc suppression coil, a device and a readable storage medium. The method comprises the steps of: monitoring a zero sequence voltage U0 of a power distribution network in real time, and judging whether the zero sequence voltage of the system is greater than 0.15 times of a busrated voltage UN; if so, starting a line selection apparatus to record the zero sequence current data of the first 1/4 power frequency period after a fault; performing frequency distribution processing on the zero sequence current data of various collected lines; and calculating frequency distribution values of the various lines according to data obtained by frequency distribution, and selectinga fault line according to the frequency distribution values. According to the single-phase earth fault line selection method provided by the invention, the fault line selection is performed by using the frequency distribution