文档介绍：双回输电线路自适应距离保护的应用研究
张华中, 王维庆,朱玲玲,周培毅,梁思聪
(新疆大学电气工程学院,新疆乌鲁木齐830000)
Application Study of Adaptive Distance Relay for Double Circuit Transmission Lines
ZHANG Hua-zhong,WANG Wei-qing,ZHU Ling-ling,ZHOU Pei-yi,LIANG Si-cong
(School of Electrical Engineering, Xinjiang University, Xinjiang Urumqi 830000 ,China)
照片尺寸为20mm*30mm;最好不用红色背景
ABSTRACT: Weaker ability of enduring transition resistance is caused by particularity of parallel double circuit line configuration and zero sequence mutual induction etc, which seriously affects performance of relay. Therefore it is difficult for traditional distance relay to satisfy high-voltage parallel double circuit lines. Based on single-phase-to-ground fault of single line of parallel double circuit transmission line, the paper is in virtue of weighing coefficients of positive negative and zero sequence currents and measured impedance of traditional distance protection to calculate additional impedance which is used to revise methods of traditional distance protection, and advances adaptive method of fault impedance of transmission lines. Moreover the method estimating embranchment coefficients of positive and negative sequence current is presented. Results show that the adaptive method has excellent performance and effectively avoids transient overreaching and under-reach of distance protection.
KEY WORDS: adaptive distance relay;transmi