T型输电线路分布式故障测距方法

A Distributed Fault Location Method for Teed Transmission Lines

针对T型线路,提出一种分布式故障测距方法。在T型线路每条支路上沿线安装两组故障电流行波检测装置,通过其检测到的首个故障行波的能量来判断故障分支,进一步通过故障分支线路上的两个故障检测点所检测的行波序列时间差计算出行波波速和故障点位置。在PSCAD中建立输电线路频依模型,分别模拟输电线路不同故障类型、不同故障位置的情况。仿真结果表明,该方法识别故障分支无死区,且可以在线计算出行波波速,从而大大提高测距精度。

A distributed fault location method is proposed for teed transmission lines. On each branch of the lines, two groups of the fault current wave sensors are installed. By the wave energy of the first fault waves, it＇s easy to distin-guish which branch has the fault. The traveling wave velocity and the location of the fault can be calculated according to the gap of the first three waves detected by the wave sensors on the fault branch. With the modeling and simulation ofthe transmission line in accordance with frequency in different fault type and position by PSCAD, it is proved that this method can effectively identify the fault branch and the online traveling wave velocity can be calculated, so it can greatly improve the location accuracy.