有串补电容输电线纵联差动保护原理  

Principle of Pilot Differential Relay Protection of Transmission Line with Series Compensated Capacitor

作　　者：郭征[1] 贺家李[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2005年第3期195-200,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(50477037).

摘　　要：传统电流差动保护应用到超高压和特高压长线路时,线路分布电容电流对其影响很大.目前电容电流补偿的方法和故障分量的方法都不能取得很好的效果.为此,提出一种应用贝瑞隆模型实现纵联差动保护的原理,该原理也可用在有串补电容的输电线路上.实现方法是用贝瑞隆模型计算线路中选定的参考点两侧的电流并进行比较,当线路安装有串补电容时,可将参考点选在串补电容安装处.理论分析和仿真结果显示该原理是正确的.该原理不受分布电容电流的影响,在灵敏度和可靠性上都优于传统的分相电流差动保护.When it is applied on extra high voltage or ultra high voltage long distance transmission line, the traditional current differential protection will be seriously affected by distributed capacitive current of transmission line. The traditional methods of capacitive current compensation and fault components are not still effective enough. So a novel principle of pilot differential relay protection of transmission line based on the Bergeron model is proposed. It can also be used on the transmission line with series compensated capacitor. The principle is to calculate based on Bergeron model and compare the currents of two sides of a selected reference point on the protected transmission line. When there is series compensated capacitor installed on the transmission line, the point may be selected on the position where the series compensated capacitor is installed. The theoretical analysis and simulation results show that the proposed principle is correct. It will not be affected by distributed capacitive current and is more sensitive and reliable than the traditional current differential protection.

关 键 词：差动保护 串补电容 贝瑞隆模型 

分 类 号：TM773[电气工程—电力系统及自动化]