局部放电脉冲在XLPE电缆交叉互联系统中传播特性探讨

局部放电脉冲在含有交叉互联系统上的传播有其一定的规律。通过在一个真实的交叉互联系统上的试验,在一相上加电压,激发出精确预制在电缆附件中缺陷的局部放电,采用差分法和宽频带脉冲检测器等方法对在系统内设计好各测点的局放脉冲进行检测并对此放电脉冲在不同频带下传播的特性进行分析,得出局放脉冲在交叉互联系统中传播的规律和特点,并提出如何利用这些规律和特点进行电缆局部放电的在线实测。

Discuss on Transportation Characteristics of PD Pulse in Cross-linking XLPE Cable System

The transportation of PD pulse in a cross-linking cable system runs in a given mode,which is detected and analyzed in an actual cross-linking cable system.When a voltage is setup in one phase,a PD pulse will be excited in the exactly pre-mounted defect in the cable accessories,measured with difference method,WF pulse detector or other method.The excited PD pulses in each testing point are detected and the transportation characteristics in different frequencies is analyzed,respectively.The modes and features of the transportation in the cross-linking system are summarized and an on-line PD pulse testing method is suggested based on these modes and features.