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The Method of Lifetime Evaluation on 10kV XLPE Cables by Isothermal Relaxation Current
Author(s): 
Pages: 33-37,52
Year: Issue:  9
Journal: Transactions of China Electrotechnical Society

Keyword:  等温松弛电流寿命评估老化因子非破坏性;
Abstract: 研究了一种新的非破坏性交联聚乙烯电缆寿命评估的试验方法.利用三阶指数衰减函数对测得的等温松弛电流数据进行拟合处理,计算得出去除稳态直流分量的电流值I,获得I*t~log(t)曲线.通过比较该曲线中峰值的位置,分析电缆绝缘各种退极化电流分量的权重,并评估绝缘的老化状态.为了方便对绝缘老化状况进行划分,引入老化因子A.试验结果表明,等温松弛电流法对电缆的寿命评估存在一定误差,但仍可以有效地评估电缆的老...
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