Small current grounding fault detection method based on vector superposition

• Main Authors: ZHANG HANWEI, LYU WEILONG, SUN SHUXIN, ZHANG BIN, BIAN PENGFEI, SHAO QINGHUA, JIANG SHUWEN, CHEN LU, ZHAO LILIN, LI YONGGANG, LIU BING, YANG HONGXING, SUN JINGTAO, NIE ZHENMING
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a small current grounding fault detection method based on vector superposition, and relates to the technical field of small current grounding fault identification of a 10kV power distribution network of a power system. And sliding a plurality of continuous fundamental wave angle vectors of the transient zero-sequence voltage ahead of the transient zero-sequence current in the full-wave data window at the abrupt change moment, superposing the obtained fundamental wave angle vectors to obtain a vector sum, and judging whether the fault is an out-of-boundary fault or an in-boundary fault by utilizing a quadrant where the vector sum is located. According to the method, the problems of difficulty in directly searching the position of the transient first half wave, short time for correcting the polar relation of the first half wave, difficulty in identification and easiness in causing misjudgment are solved, and the stability and the accuracy of a judgment result are improved. After original