配电网选线和测距新方法研究  

A novel method for fault line selection and location in distribution system

作　　者：赵化时[1] 姚李孝[2] 柯丽芳[2] 伍利[2] 

机构地区：[1]国电南瑞科技股份有限公司,江苏南京210061 [2]西安理工大学电力工程系,陕西西安710048

出　　处：《电力系统保护与控制》2010年第16期6-10,17,共6页Power System Protection and Control

摘　　要：配电网络由于分支多,发生故障后,过渡电阻大,不容易正确选线和准确测距。利用一套高采样率的电流互感器和一套常规的电压互感器实现多馈线系统选线和测距。在所有线路的长度已知的情况下,利用小波变换获取电流暂态行波,根据暂态行波波头计算出各个波头对应的距离;根据已知的线路的长度进行排除,找出故障线路;给出故障点的位置和故障线路。ATP仿真结果表明,该方法在配电网络发生单相接地故障时,能够正确选出故障线路并且准确地测得故障点的位置,且不受过渡电阻和系统运行方式的影响。Since there are many bifurcations and large transient resistance in distribution system（DS）,traditional fault location algorithm cannot get the correct location and fault line selection when fault.A set of high-sampling-rate CT and a set of conventional PT are used to realize multi-feeder system’s fault selection and location.On the condition that the lengths of all lines are known,using wavelet transform to acquire the transient current traveling wave,and using the transient traveling wave head to calculate the distance between each wave head differing with the first wave head;then adopting the known line length to exclude sound feeders,thereby to find fault distance and select the fault line.ATP simulation show that when single phase ground fault in distribution system the algorithm proposed in this paper is accurate for fault line selection and location and immune to transient resistance and system operation mode.

关 键 词：故障选线 行波测距 阻抗法测距 小波分析 

分 类 号：TM755[电气工程—电力系统及自动化]