一种适于多分支输电线路的故障定位新方法  

A Novel Fault Location Method Suitable for Transmission Line With Multi Branches

作　　者：王波[1] 江全元[2] 顾伟[1] 陈东海[1] 

机构地区：[1]宁波电业局,浙江省宁波市315000 [2]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电网技术》2013年第4期1152-1158,共7页Power System Technology

摘　　要：提出一种适于多分支输电线路的故障定位新算法,该方法首先定义了一种节点电流不平衡量,经证明发现该不平衡量仅出现在故障支路所在的节点;利用该指标仅在故障所在支路的节点阻抗矩阵出现非零元素的特性,提出一种基于节点电压假设的故障辨识方法来实现故障支路的准确判断、故障位置的精确定位,并最终将复杂的故障定位算法转化为一元二次方程的求解。大量的仿真实验表明上述方法能有效地解决多分支输电线路的故障定位问题,工程应用适用性强、计算速度快且精确度高。A new fault location algorithm for transmission line with multi terminals is proposed. Firstly, a new index for the unbalance of nodal current is defined, and it is proved that such a nodal current unbalance only appears at the node connected with the faulty line; secondly, utilizing the peculiarity of the defined index that nonzero elements only exist in the admittance matrix of the node connected with the faulty line and based on the assumption of nodal voltage, a fault identification method is proposed to judge the faulty branch rapidly and locate the fault accurately; finally, the complex fault location algorithm is turned into the solution of quadratic equation. A lot of simulative experiments show that above-mentioned method can solve the fault location of transmission line with multi branches efficiently and accurately.

关 键 词：故障定位 传输线路 故障节点电流非平衡量 阻抗矩阵 

分 类 号：TM771[电气工程—电力系统及自动化]