交流叠加冲击电压下XLPE绝缘中电树起始特性

Experimental Study on the Electrical Tree Inception Characteristics of XLPE Insulation under AC Voltage and Superimposed I-mpulse Voltage

ＸＬＰＥ绝缘在交流叠加冲击电压作用下电树起始特性的试验研究表明，电树的冲击起始场强不仅与预加的交流电压的大小有关，还与冲击电压与交流电压的相对极性有关，并有明显的累积效应，起晕也有明显的时延现象。

This paper deals with treeing inception voltagecharacteristics of XLPE cable insulation subjected to impulse voltage superimposed on AC voltage. The impulse inccption strength of electrical tree was found to be dependenton the pre-applied AC stress and the relative polarity of thesuperimposed impulse voltage. Besides, it also shows obvious accumulative effect and tree inception delay. These phenomena are discussed in connection with the space charge effect.