交联聚乙烯电缆附件局部放电的联合检测方法研究

Research on Joint Detection Method for Partial Discharge in XLPE Cable Accessories

随着交联聚乙烯(XLPE)电缆线路的增多和投运时间的逐年增长,各类问题逐渐凸显,尤其是电缆附件的绝缘事故不断增多,而局部放电是评价XLPE电缆绝缘状况的重要指标,也是诊断电缆故障的有效方法。简要介绍当今常用的2种电缆局部放电在线监测方法,即电容差分法和特高频法(UHF),重点介绍了它们的联合检测,利用差分传感器解决局部放电标定问题,利用UHF特高频传感器进行抗干扰处理。运用联合检测方法对现场运行的XLPE电缆进行了局部放电在线监测,取得了良好的效果。

With the increase of XLPE cable lines and its annually growing operation time, diverse problems in XLPE cables are gradually highlighted, among which are the growing insulation accidents in cable accessories. Partial discharge is not only an important indicator for evaluation of insulation condition of XLPE cables but an effective method for cable faults diagnosis. This paper briefly introduces two common online monitoring methods for cable partial discharge, namely capacitance difference method and ultrahigh frequency（UHF） method. The paper focuses on the joint detection method, which uses capacitance difference method to demarcate partial discharge and uses UHF sensors to resist interference. Favorable effect is achieved by using joint detection method to detect partial discharge of field operating XLPE cables.