摘要
针对T型线路中出现同杆双回线的线路结构,提出了首先做故障分支判定,然后进行精确测距的新方法。当某支路发生故障时,求取各支路保护安装处的突变量,通过正序网络图,计算两个必要参数用于判别故障支路,区分出非同杆双回线故障、同杆双回线的跨线故障,以及同杆双回线的单回线故障。在此基础上,将非故障支路化简合并,并对同杆双回线故障以及非同杆双回线故障进行分别测距。该方法不仅能够对单回线准确测距,而且针对双回线,也保证了故障测距的精确性,一定程度上克服了T型线路中出现双回线给测距带来的困难。大量的ATP仿真结果表明故障测距的精度基本上不受故障支路,故障类型、系统运行方式、故障点过渡电阻等因素的影响。
A new fault location method is proposed in this paper for the teed lines with parallel branches based on the determinant of the faulted branch. When one branch is fault, the faulted electrical measurements are calculated. Based on the positive network, two necessary parameters are calculated to distinguish the faulted branch, namely, the fault of the non-parallel branch, cross fault of the parallel branch and the one-line fault of the parallel branch. Then, the non-fault branches are united and the fault location for the faulted branch can be implemented. The location method can locate the faulted point not only for the single-branch but also for the parallel branch, overcoming the difficulty of fault location when parallel branch occurs in the teed lines, A lot of ATP simulation results indicate that the fault location accuracy is not influenced by such factors as faulted branch, faulted type, generation mode and the faulted resistance.
出处
《继电器》
CSCD
北大核心
2007年第13期6-10,20,共6页
Relay
关键词
T型线路
双回线
六序分量法
故障测距
teed lines
parallel transmission lines
six-sequence component method
fault location
