基于直流漏泄电流的无铠装电缆绝缘性能检测方法

Detection of Insulating Performance for Unarmored Cable under DC Leakage Current

电缆绝缘性能的好坏对供电系统连续运行具有重要意义。采用直流漏泄电流方法,提出一种无铠装电缆的绝缘性能检测方法。该方法把电缆两端电流的同步测量,转换成电缆输出端开路时输入端电流的准确测量,简化了测量的复杂性,提高了直流漏泄电流的测量精度,改善了电缆绝缘性能的诊断准确度。该法用于地铁牵引变电站直流馈线电缆绝缘性能检测中,取得了良好的效果。

The insulation of cable is crucial for the running of power system. This paper proposes a detecting method of the unarmored cable insulation by using DC leakage current, which transforms the synchronous measurement of the cable input - output current into a precise measurement of the input current, as to simplify the detecting method and enhance the precision of the current measurement. This method is applied to detect the insulation of feeder line cable in metro substations and has already obtained good result.