基于C型行波法的轨地绝缘损坏定位方法研究

Fault Location of Track/Ground Local Insulation Defect Based on C-type Travelling Wave

城市轨道交通轨地绝缘影响杂散电流及轨电位的分布,实际工作中需要对轨地绝缘状况作详细了解。过渡电阻的测量,不能反映轨地局部绝缘损坏情况。借鉴电力系统故障定位方法,对基于C型行波法的轨地局部绝缘损坏定位方法进行了分析研究。介绍了C型行波法定位原理,并对故障特征波的确定做了说明。通过仿真验证了此方法的可行性,并得出绝缘损坏处接地电阻不影响定位准确性的结论。

track / ground local insulation of urban rail tran- sit effects the distribution of stray current and the rail po- tential directly. In practice, the track / ground insulation condition of rail should be understood in details, but the measurement of transition resistance can＇t reflect the condi- tion of track/ground local insulation defect fault. By refer- ring to the power system fault location technology, the method on track / ground local insulation defect fault loca- tion based on C-type travelling wave is analyzed, the princi- ple of C-type travelling wave positioning is explained in de- tail. Finally, the feasibility of this method is verified by simulation, and the result shows that the grounding resist- ance does not affect the accuracy of detection.