特高压交流长线路零序电抗继电器动作特性分析及改进  

Analysis and Improvement of Zero Sequence Reactance Relay With Applications in Ultra-High-Voltage Long AC Transmission Lines

作　　者：王宾[1] 董新洲[1] 薄志谦[2] Andrew Klimek 

机构地区：[1]清华大学电机系电力系统及发电设备控制和仿真国家重点实验室,北京100084 [2]阿海珐输配电有限公司,英国斯塔福德郡ST17 4LX

出　　处：《电工技术学报》2008年第12期60-64,共5页Transactions of China Electrotechnical Society

基　　金：国家973计划(2004CB217906);高等学校博士学科点专项科研基金(200600030)资助项目

摘　　要：特高压交流长线路上,测量阻抗与故障距离呈双曲正切函数关系,因此接地阻抗继电器的动作特性受过渡电阻的影响严重,无法直接使用。传统高压、超高压线路普遍采用零序电抗继电器来提高抗过渡电阻能力,本文评估了零序电抗继电器在特高压线路上的适用性;针对存在的保护动作区缩小、灵敏度降低的问题,采用负序电流作为极化量,并考虑了负荷电流的影响,提出了一种适用于特高压交流长线路的负序电抗继电器,仿真结果表明该继电器具有保护区稳定、灵敏度高的优点。The performance of ground impedance relay with applications in UHV transmission lines is easy to be disturbed by earth resistance, since the linear relation between measuring impedance and fault distance is replaced by the hyperbolic tangent function. The zero sequence reactance relay （ZSRR） is widely adopted in high-voltage and extra-high-voltage transmission systems due to its good anti-resistance ability and stable protective zone. Hence the ZSRR is evaluated in this paper to verify its performance with applications in UHV lines. And in response to the existed questions, such as the obvious protective zone and relay sensitivity reduction, the possible influence factors are analyzed, and then a novel negative sequence reactance relay is proposed with considering the impact of load current. The simulation results prove its good performance.

关 键 词：特高压 分布电容 零序电抗继电器 负序电抗继电器 

分 类 号：TM588.4[电气工程—电器]