Optical fiber differential protection system and protection method adaptive to multi-section complex transmission path line

• Main Authors: XIAO CHUANG, LUO JIAYONG, JI YUANTAO, CHEN SIYUAN, ZHOU JINGWEI, LIANG GANG, SUN WENMENG, WANG YEXING, ZHANG HUAN, LI NENGCHANG
• Format: Patent
• Language: Chinese; English
• Published: 03.10.2023
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses an optical fiber differential protection system and protection method adaptive to multiple sections of complex transmission path lines. The system comprises two sections of indoor transmission lines A, B, C and D, an outdoor transmission line is arranged between the indoor transmission lines; two ends of the indoor transmission line are provided with current transformers CT1 and CT1 '. The system is characterized in that current transformers CT2 and CT2' are arranged between the indoor transmission line and the outdoor transmission line; cT1 and CT2 are electrically connected with the protection device A, and CT1'and CT2 'are electrically connected with the protection device A'; a circuit breaker DL1 is arranged between the CT1 and the CT2, and a circuit breaker DL2 is arranged between the CT1'and the CT2 '; compared with traditional optical fiber differential protection, a current transformer is additionally arranged between an indoor transmission line and an overhead line, and whethe