以某牵引变电所长度为100 m左右的埋地电缆为研究对象,对电缆故障泄漏电流检测法进行理论分析与建模仿真研究,泄漏电流通过电缆首尾端电流的差值获得.研究表明,泄漏电流会随着电缆绝缘材料劣化的加剧而出现增大的趋势,根据该变化趋势可以作为电缆发生老化故障的判断依据.劣化过程中电缆首尾端电流的相位差也会出现增大的趋势;对该相位差进行校正以计算出正确的泄漏电流值,对于保证该检测方法的有效性具有重要意义.%Based on the contact network of about 100 meters of buried cable in a traction substation,studying on the cable fault leakage current detection method both theoretically and in the way of simulation,the leakage current can be obtained by subtracting the current head and tail ends of each cable.Simulation study shows that,the leakage current will increase with the deterioration of the cable insulation material;and the trend of the change can be used as the basis for judging whether the insulation of the cable is aging or not;and in the deterioration process,the phase difference of current cable head and tail end will has a tendency of increase.Therefore,the phase difference is corrected to calculate the correct leakage current value,which has important significance to guarantee the validity of this method.
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