带串联电容补偿装置的电力牵引网故障测距研究

Research on fault locating of power traction system with series compensation

电力牵引网故障测距一般采用电抗法,但增加了串补电容的电力牵引网线路电抗单调性遭到破坏。基于线路R-L-C模型,采用微分方程法分析计算,提出带串补线路电力牵引网故障点位于电容前或电容后位置的识别方法。对于不同过渡电阻、不同短路相角情况下,基于可替代暂态程序仿真和Matlab的分析表明,该方法能有效判别故障点位于电容前或电容后的位置。此后,可通过常规的电抗法进行测距。

Reactance method is commonly adopted in fault locating of power traction system.However,the monotone relation between reactance and distance is broken in power traction system with series compensation. Based on R-L-C model,whether the fault location is before or after the com-pensatory capacitor is detected by analyzing and calculating its differential equation. The simulation with alternative transient program and Matlab shows its effectiveness for cases with different fault anagles and different transitional resistances. After knowing the fault location is before or after the compensatory capacitor,the reactance method can be used to locate the fault.