不同电压等级同塔四回输电线路不同运行方式下零序互感对接地距离保护的影响  

Influence of Zero-Sequence Mutual Inductance on Earth-Fault Distance Protection for Four-Circuit Transmission Lines Belonging to Different Voltage Classes on Same Tower Under Different Operation Modes

作　　者：赵凯超[1] 周泽昕[1] 杜丁香[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2010年第12期193-197,共5页Power System Technology

摘　　要：分析了不同电压等级同塔四回线路在不同运行方式下,零序互感对接地距离保护零序电流补偿系数及测量阻抗的影响。理论分析表明:所有运行方式中,线路同塔双回运行时零序电流补偿系数最大,测量阻抗最小;1回运行,其他3回检修接地时,对应的零序电流补偿系数最小,测量阻抗最大。在此基础上,给出了接地距离保护零序电流补偿系数的整定建议。利用RTDS对1 000 kV/500 kV同塔四回线路进行了仿真验证,仿真结果与理论分析一致。The influences of zero-sequence mutual inductance on zero-sequence current compensating factor and measured impedance of earth-fault distance protection for four-circuit transmission lines belonging to different voltage classes on same tower under different operation modes are analyzed. Theoretical analysis results show that in all operation modes the zero-sequence current compensating factor reaches its highest value and the measured impedance reaches its lowest value under the operation mode of two-circuit transmission lines on the same tower; the zero-sequence current compensating factor is the lowest and the measured impedance is the highest under the condition that one circuit is operated and the rest of the circuits are artificially grounded for the maintenance. On this basis, a suggestion on the setting of zero-sequence current compensating factor of earth-fault distance protection is given. Simulation verification of four-circuit transmission lines respectively belonging to 500？kV and 1？000？kV power grids on the same tower is performed by real-time digital simulator （RTDS）, and simulation results conform to the results of theoretical analysis.

关 键 词：运行方式 零序互感 同塔四回输电线路 接地距离保护 零序电流补偿系数 测量阻抗 

分 类 号：TM773[电气工程—电力系统及自动化]