摘要
用针-板电极模拟实际运行电缆由于其中含杂质、半导体层突起等原因引起的电场不均匀现象.采用取自成型高压交联聚乙烯(XLPE)电力电缆,按实验要求加工成一定形状的试品,研究XLPE电缆绝缘在交流电压叠加冲击电压作用下的起始放电电压特性.结果表明,预加交流电压幅值较小时,电树的冲击电压起晕值基本不变,但预加交流电压超过某一临界状态时。
The tree inception voltage characteristics of XLPE cable insulation subjected to impulse voltages superimposed on AC voltage was studied. The experiments were performed on laboratory molded specimens equipped with the needle plane electrode. It can be observed that when the AC voltageis relatively low, the tree inception voltages are very little affected by the pre applied AC voltage. However, always decrease when the pre applied AC voltage reaches and exceeds a certain threshold.
出处
《郑州轻工业学院学报》
1999年第4期11-14,共4页
Journal of Zhengzhou Institute of Light Industry（Natural Science）
关键词
电力电缆
起始放电
高压交联聚乙烯
雷击
XLPE
space charge
electric cables
electric corona
inception voltage characteristics
high pressure cross linking polyethylene
