同杆线路零序互感对纵联距离保护的影响  

Influence of Zero Sequence Mutual Inductance on the Pilot Distance Relay in Multi-circuit Transmission Lines

作　　者：肖伟强[1] 蔡泽祥[1] 刘为雄[2] 曾耿晖[1,3] 陈桥平[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]广东水利电力职业技术学院,广东省广州市510635 [3]广东省电力调度中心,广东省广州市510600

出　　处：《电力系统自动化》2009年第3期84-88,共5页Automation of Electric Power Systems

摘　　要：由于同杆线路故障时电磁耦合的特殊性,其纵联距离保护误动和拒动的情况时有发生,而其距离测量元件在故障位置判断中起着关键的作用。当发生接地故障时,由于零序互感的影响,接地测量阻抗会产生偏差,导致保护的超范围与欠范围动作。文中结合电网运行实际,基于不同系统运行方式、线路运行方式和同杆架设形式,定性和定量地研究了零序互感对接地测量阻抗的影响,并进一步分析了线路的不同运行方式下测量阻抗的偏差和影响的特征,进而提出了采用配置零序电流补偿系数的方式消除接地距离保护的测量误差的方案。In recent years, mal-operation of pilot distance relay happens occasionally in multi-circuit transmission lines because of the complexity of electromagnetic coupling. The distance measure device of the relay plays a key role in fault locating. The deviation of the measured grounding impedance may be caused by influence of zero mutual inductance, and potentially lead to over or under range action of the relay. Considering the inherence of power system states and based on its various operating modes, operation condition and arrangements of multi-circuit lines, qualitative and quantitative analysis of the influence from zero mutual inductance on the measured grounding impedance is given. Furthermore, a method which configures the zero sequence current compensation factor to eliminate the measurement error of ground distance protection is also provided.

关 键 词：同杆线路 测量阻抗 零序互感 接地故障 

分 类 号：TM773[电气工程—电力系统及自动化]