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.
出处
《电网技术》
EI
CSCD
北大核心
2010年第12期193-197,共5页
Power System Technology
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
operation modes
zero-sequence induction
four-circuit transmission lines on the same earth-fault distance protection
zero-sequence compensation factor
measured impedance mutual tower
current
