特高压皖电东送线路零序互感对接地距离保护的影响  

Impact of Zero-sequence Mutual Inductance in UHV Anhui-to-east Power Transfer Lines on Phase-earth Distance Protection

作　　者：张波[1] 陈福锋[2,3] 王玉婷[2,3] 薛明军[2,3] 何奔腾[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]国电南京自动化股份有限公司,江苏省南京市211100 [3]南京国电南自电网自动化有限公司,江苏省南京市211100

出　　处：《电力系统自动化》2013年第21期94-98,共5页Automation of Electric Power Systems

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.

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 

分 类 号：TM773[电气工程—电力系统及自动化]