利用过渡电阻参数识别的输电线路永久性故障确认方法  

Permanent Fault Identification Method of Transmission Lines Using Transition Resistance Parameter

作　　者：索南加乐[1] 代玲[1] 宋国兵[1] 王增超[1] 仝小虎[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《高电压技术》2011年第8期1944-1951,共8页High Voltage Engineering

基　　金：国家自然科学基金(50877062);国家自然科学基金重点项目(51037005)~~

摘　　要：为了确定带并联电抗器输电线路单相接地故障后的熄弧时刻,提出了一种永久性故障确认方法。以单相接地故障断路器跳开后含过渡电阻支路的输电线路π型等效模型为参数辨识模型,在故障测距结果已知的情况下,通过计算过渡电阻值区分永久性故障和瞬时性故障。永久性故障情况下,所得过渡电阻值较小,瞬时性故障情况下,所得过渡电阻值很大。利用电力系统电磁暂态仿真计算(alternative transients program,ATP)软件建立线路仿真模型并进行各种故障情况下的仿真,然后通过MATLAB(matrix laboratory)编程对仿真结果进行处理,采用最小二乘法计算过渡电阻值并画出图形,分析图形可判别故障性质。与传统判据相比,该方法具有不受非周期分量和暂态谐波影响等优点,且可反映永久性故障的严重程度,并能准确判断故障点熄弧时间。大量ATP仿真验证表明,该判别方法能够快速识别故障性质,适用于单端、双端带并联电抗器输电线路的快速单相自适应重合闸。We propose a method to identify permanent faults for the transmission lines with shunt reactors. The method uses π type equivalent model （including the transition resistor branch） of single-phase fault that is switched off as the proto type, and di^tinguishes permanent fault from transient fault by calculating the value of transition re- sister. Furthermore, it {s supposed that the result of fault location is known. In the case of permanent fault, the cal- culated value of transition resistor is very low, but for the transient fault, the value ot＂ transition reslstdr is very high. An alternative transients program （ATPIsimulation software is used to make simu/ation models of transmis- sion lines to emulate transmission line faults in all situations. Then the simulation results are processed through edi- ting MATLAB（matrix laboratory） program, which uses least-square method to calculate the value of transition re- sistor and then draws figures of the results. Through analyzing the figures, we can distinguish permanent fault from transient fault. Compared with traditional criterions, this method is not influenced by non-periodic components and transitidn condition harmonics, etc. Moreover, the severity of the permanent fault can be reflected through calculat- ing the value of transition resistance and the extinction time of secondary arc can be assessed. ATP simulation re- sults show that the proposed method can effectively distinguish permanent fault from transient fault. This method can be applied to the single-phase adaptive reclosure in transmission lines with shunt reactors.

关 键 词：输电线路 参数识别 “型等效模型 单相重合闸 过渡电阻 永久性故障 重合闸时间 

分 类 号：TM773[电气工程—电力系统及自动化]