基于等温松弛电流法的交联聚乙烯电缆绝缘老化研究  

Study on Insulation Aging of Crosslinked Polyethylene Cable Based on Isothermal Relaxation Current Method

作　　者：宋余来 王晓岩 吴海朋 陈祥朋 朱广越 Song Yulai;Wang Xiaoyan;Wu Haipeng;Chen Xiangpeng;Zhu Guangyue(Qingyuan Power Supply Bureau of Guangdong Power Grid Cooperation,Qingyuan Guangdong 511500;State Grid Jilin Electric Power Supply Company,Changchun Jilin 130000;Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]广东电网有限责任公司清远清城供电局,广东清远511500 [2]国网吉林省长舂供电公司,吉林长春130000 [3]东北电力大学电气工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2020年第1期15-20,共6页Journal of Northeast Electric Power University

基　　金：国家自然科学基金(51877034);国网吉林宵电力公司科技项目(2018-1)。

摘　　要：等温松弛电流(Isothermal Relaxation Current,IRC)法属于非破坏性试验,且其不需与电缆出厂时参数进行对比即可判断交联聚乙烯(Crosslinked Polyethylene,XLPE)电缆绝缘老化状态.对测得等温松弛电流数据整理得到I-t曲线,并运用三阶指数函数模型,对试验所得数据进行拟合处理得到不对称钟形曲线和指数函数分峰曲线.结合这三种曲线,与引入的老化因子值对比分析.结果表明,在IRC法评估电缆老化状态时,电缆样品绝缘老化程度与其现役年限的多少具有明显的一致性;在不对称钟形曲线中,当峰值出现位置所对应的时间(横坐标)值越大,表明其老化程度相对越严重.The Isothermal Relaxation Current(IRC)method is a non-destructive test,and it can judge the insulation aging state of Crosslinked Polyethylene(XLPE)cable without comparing the parameters of the cable with the factory.The I-t curve is obtained by measuring the isothermal relaxation current data,and the thirdorder exponential function model is used to fit the experimental data to obtain the asymmetric bell curve and the exponential function peak curve.Combine these three curves and compare them with the values of the introduced aging factors.The results show that when the IRC method is used to evaluate the aging state of the cable,the insulation aging degree of the cable sample is obviously consistent with the number of active service years.In the asymmetric bell curve,the time(abscissa)value corresponding to the peak appearance position is higher.Large,indicating that the degree of aging is relatively more serious.

关 键 词：XLPE 电缆 IRC法 老化因子 状态评估 

分 类 号：TM614[电气工程—电力系统及自动化]