带串联电抗器输电线路距离保护整定改进方法  

Improved Setting Method of Distance Protection for Transmission Line With Series Reactor

作　　者：朱晓彤[1] 陆金凤[1] 谢华[1] 赵青春[1] 王忠[1] ZHU Xiaotong;LU Jinfeng;XIE Hua;ZHAO Qingchun;WANG Zhong(NR Electire Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力工程技术》2018年第6期156-160,共5页Electric Power Engineering Technology

摘　　要：串联电抗器可以很好地限制电网的短路电流,但同时给输电线路继电保护带来了挑战。文中提出了一种带串联电抗器的输电线路距离保护整定改进方法,根据串联电抗器阻抗和线路阻抗重新整定零序电流补偿系数,根据串联电抗器阻抗和原距离保护阻抗定值重新计算距离保护定值。只需修改保护装置定值,无需改变距离保护算法代码,即可保证带串联电抗器的输电线路距离保护Ⅰ段的可靠性和距离保护Ⅱ段、Ⅲ段的灵敏性。仿真结果验证了文中方法在保护可靠性和灵敏性方面的效果。The series reactor can limit the short circuit current of the power grid, but it also brings challenges to the relay protection. An improved setting method for the distance protection of transmission lines with series reactor is presented. The compensation coefficient of zero sequence current is adjusted according to the series reactor＇ s impedance and line＇ s impedance. The distance protection settings are calculated according to the series reactor＇ s impedance and the original distance protection impedance. The improved setting method can guarantees the reliability and sensitivity of distance protection just by modifying the settings and without changing the code. The simulation results demonstrate the effectiveness of this method.

关 键 词：串联电抗器 距离保护 零序电流补偿系数 阻抗定值 

分 类 号：TM734[电气工程—电力系统及自动化]