特高压输电线分相电流相位差动保护的研究  

Research on segregated current phase differential protection for UHV transmission lines

作　　者：徐松晓[1] 贺家李[1] 李永丽[1] 王艳[1] 李斌[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：《继电器》2007年第3期1-5,24,共6页Relay

基　　金：国家自然科学基金资助项目(50477037)

摘　　要：针对传统相位差动纵联保护反应各种故障的灵敏度不同的缺点以及特高压输电线路的分布电容较大等特点,提出了基于贝瑞隆模型实现特高压输电线路分相相位差动纵联保护的新原理。介绍了利用贝瑞隆模型计算输电线路故障的方法,推导了实现分相相位差动纵联保护的判据及闭锁角的整定原则,综合分析了各种故障状态下保护的动作情况,解决了各种故障下的故障判别以及特高压线路上的大电容电流影响等问题。提出了用于故障后1～2个周波的基于电流故障分量的分相相位差动保护新原理,大大提高了保护承受过渡电阻的能力和动作速度。用ATP和Matlab仿真证明了该原理的正确性和用于特高压输电线的优越性。While it is applied on UHV transmission lines, the traditional current phase differential protection will seriously be affected by distributed capacitive current of transmission line. So a novel principle of phase segregated current phase differential protection for UHV transmission lines based on Bergeron model is proposed for the first time in this paper, It introduces the method of fault analysis of transmission lines based on Bergeron model and analysis of protection operation in case of every type of fault. The proposed principle will not be affected by distributed capacitive current and is more sensitive and reliable than traditional current phase differential protection. The paper also proposes another new principle of phase segregated current phase differential protection based on fault component used during 1~2 periods after fault inception to improve the ability of bearing transition resistance. Simulation results by ATP and MATLAB confirm that the principle is correct and has best performances when used on UHV transmission lines.

关 键 词：分相相位差动 贝瑞隆模型 特高压输电 故障分量 继电保护 

分 类 号：TM773[电气工程—电力系统及自动化]