Power distribution network single-phase earth fault line selection method and system based on current increment ratio

• Main Authors: YU KUN, LI JIAKANG, ZENG XIANGJUN, HE SHIGENG, LAN YUTING, JIANG ZHUANG, LIAO WANGHUI
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a power distribution network single-phase earth fault line selection method and system based on a current increment ratio, and the method comprises the steps: injecting zero-sequence current into a system after a single-phase earth fault occurs, reducing the injection current after a set time, and recording the zero-sequence current variation of all feeder lines; defining an increment ratio and selecting a reference feeder line, and further calculating an increment ratio and a phase angle of the reference feeder line relative to each of other feeder lines; the increment ratio is the ratio of the zero-sequence current variable quantity of every two feeder lines, and the phase angle of the increment ratio is the difference between the phase angle of the zero-sequence current variable quantity of the reference feeder line and the phase angle of the zero-sequence current variable quantity of the feeder line; and determining a fault feeder according to the absolute value of the phase angle