Method and system for realizing aerial line and submarine cable mixed line distance measurement through 5G communication

• Main Authors: SU YI, XIAO YUANQING, WU YEKAI, ZHAO ZHIHONG, YU HONGLEI, XU GANG, XIONG JUN, ZHANG YUEPIN, CAI XINWEI, DU ZHAOQIANG, CHEN QIURONG
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING; WIRELESS COMMUNICATIONS NETWORKS

A method for achieving aerial line and submarine cable mixed line distance measurement through 5G communication is characterized in that an aerial line comprises a first aerial line and a second aerial line, the mixed line is formed by sequentially connecting the first aerial line, a submarine cable and the second aerial line, and the method comprises the following steps that three-phase currents and three-phase voltages at the two ends of the mixed line and three-phase currents at the two ends of the submarine cable are obtained; according to the three-phase current at the two ends of the mixed line, judging whether the current differential protection at the two ends of the mixed line acts or not, and if not, ending; and judging whether the fault point is on the submarine cable or not according to the three-phase current at the two ends of the submarine cable. And if the calculated distance of the submarine cable fault point has no solution, sequentially judging whether the fault point is on the two overhead