输电线路故障定位距离修正的等效折算法  

Equivalent-conversion Method to Modify Fault Location Distance of Transmission Line

作　　者：徐志强[1] 

机构地区：[1]北京送变电公司,北京市102401

出　　处：《电力建设》2009年第7期39-42,共4页Electric Power Construction

摘　　要：针对线路分布电容影响集中参数模型定位精度的问题,提出了一种能有效减小分布电容影响、提高集中参数模型定位精度的修正算法。以集中参数阻抗等效一定长度的线路分布电容,然后依据集中参数线路模型,利用对称双端口网络传输方程进行折算处理,将等效阻抗折算成线路阻抗,得到了分布电容处理的修正计算公式。基于修正计算公式结合集中参数线路模型,形成的修正定位算法,在一定程度上消除线路分布电容带来的定位误差。按此修正算法进行的EMTP仿真分析验证了该算法在改善线路故障定位精度上的有效性。Pointing to the problem which distributed capacitance of transmission line affects on the accuracy of fault location, a modified algorithm is presented to improve effectively the accuracy of fault location for lumped parameter model, and reduce influence of distributed capacitance. Taking lumped parameter impedance equivalent to distributed capacitance of transmission line on certain length, then following model of lumped parameter conversion is carried out by symmetrical two-port network transfer equation in which the equivalent impedance is converted to the line impedance and correction formula of distributed capacitance is deduced. The improved location algorithm resulting from the revised formulas and the model of lumped parameter circuit can eliminate location error caused by the distributed capacitance to a certain extent. EMPT simulation analysis has shown the effectiveness of the improved algorithm on the improving accuracy of fault location.

关 键 词：输电线路 故障定位 集中参数模型 等效折算法 

分 类 号：TM752[电气工程—电力系统及自动化]