摘要
分析了双回线路发生接地故障时零序电流的分布特点、零序互感对接地距离保护的影响、接地距离保护中零序补偿系数(K值)的取值方法,以及不同的K值整定方案对保护动作范围的影响。对特高压1 000kV皖电东送工程双回线路进行了仿真分析,给出了不同工况下沿线各点故障测量阻抗的变化轨迹,以及不同零序补偿系数下各自的距离Ⅰ段整定参考值和保护的相应动作范围。最后结合工程实际,综合考虑整定的方便性和保护的灵敏性、安全性,给出了供参考的距离保护相关定值的整定方案。
Distribution characteristics of zero-sequence current when parallel transmission lines grounding fault happens, the impact of zero-sequence mutual inductance on phase-earth distance protection, the setting method of zero-sequence compensation coefficient （K values） in grounding distance protection, and the impact of different K value setting schemes on protecting range of action are analyzed. With the simulation analysis of ultra-high voltage （UHV） 1 000 kV Anhui-to-east power transfer parallel transmission lines, change trajectories of fault calculating impedance under different working conditions along the line, the setting reference values and protecting action range of zone I distance with different zero-sequence compensation coefficients are given. Finally, combining with the engineering practice, and considering the setting convenience and the protection sensitivity and safety, referential setting schemes for distance protection related constant values are proposed.
出处
《电力系统自动化》
EI
CSCD
北大核心
2013年第21期94-98,共5页
Automation of Electric Power Systems
关键词
特高压电网
双回线
零序互感
零序补偿系数
接地距离保护
ultra-high voltage （UHV） power grid
parallel transmission lines
zero-sequence mutual inductance
zero-sequence compensation coefficient
grounding distance protection
