摘要
探讨了有关特高压线路保护的2个特殊问题:一是保护动作顺序对限制线路过电压的必要性和效果;二是特高压长线分布电容引起的电容充电电流对差动保护的影响。理论分析和仿真结果表明:合理设置保护动作顺序可以有效限制故障开断过程中产生的过电压;未采取补偿措施的分相电流差动保护不适合于特高压长距离输电线路。
This paper discusses two special problems on relay protection of ultra-high voltage (UHV) transmission line: one is the effect of protection relay operation order on surge voltage, and another is the influence of charge current caused by distributed capacitances in UHV long transmission line on the current differential protection. Theoretical analysis and simulation results show that: adjusting protection relay operation order can effectively limit the surge voltage formed by the operation of circuit breaker, and the existed phase current differential protection with no compensation measurements is unsuitable for UHV transmission lines.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第22期19-22,共4页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50077011
50377019)
国家自然科学基金国际合作基金资助项目(50140430686)
关键词
特高压输电线
继电保护
分布电容
过电压
ultra-high voltage (UHV) transmission line
protective relaying
distribution capacitance
surge voltage
