Direct-current power distribution network single-pole grounding fault line selection method and device based on integral area

• Main Authors: ZHANG ZHIHUA, WANG XIAOWEI, SHAO MEIYANG, QUAN LI, WANG LUJIN, WANG YIZHAO, TIAN YING, DOU MINNA
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a direct-current power distribution network single-pole grounding fault line selection method and device based on an integral area. Firstly, bus positive and negative voltage signals of a power distribution network and positive and negative current signals of each line are sampled; and starting a fault criterion by using the variable quantity of the bus voltage. Secondly, calculating the definite integral areas of the positive current and the negative current of each feeder line before and after the fault, calculating the difference between the obtained definite integral areas before and after the fault, and judging whether the current of each line is increased or decreased so as to determine whether the sign of the definite integral area after the fault is positive or negative; and then, performing algebraic summation on the definite integral areas of the positive electrode and the negative electrode of each feeder line after the fault. And finally, calculating a sign function corresp