中国电机工程学报Issue(16)：4271-4279,9.DOI:10.13334/j.0258-8013.pcsee.2015.16.032
基于蠕变模型的水树老化电缆绝缘自恢复机制
Insulation Self-recovery Mechanism of Water Tree Aged Cables Based on a Creep Model
摘要
Abstract
To accurately evaluate the insulation condition of water tree aged cables, this paper addresses the relationship between the self-recovery properties of insulation and the microstructure changes in water tree aged cables, and a mechanism of insulation self-recovery is presented based on a creep model. During the process of accelerated water tree aging, the dielectric loss factor and the leakage current increased with the aging time, and the water tree branches can be clearly observed in the aging area. However, the two electrical parameters decreased when the applied voltage was removed from the aged samples, and a self-recovery phenomenon of insulation appeared. Based on the “string of peals” model and the four-element creep model, the relationship between the changes of water tree microstructure and the water tree self-recovery phenomenon was investigated. According to the results of electric field simulation and the creep theory, the effect of the creep process on the dielectric loss factor and the leakage current was also analyzed. The results show that the water tree self-recovery phenomenon is closely related to the changes of water tree microstructure. During the period without applied voltage, the creep process of water tree leads to closing of water tree channels and shrink of water tree voids, which can lead to the reduction of the dielectric loss factor and the leakage current. Therefore, the water tree creep process is the main reason for the cable insulation self-recovery.关键词
交联聚乙烯电缆/水树/电-机械应力/自恢复性/蠕变Key words
XLPE cable/water tree/electrical-mechanical stress/self-recovery/creep分类
信息技术与安全科学引用本文复制引用
周凯,陶文彪,赵威,陶霰韬,蔡钢,刘曦,杨琳..基于蠕变模型的水树老化电缆绝缘自恢复机制[J].中国电机工程学报,2015,(16):4271-4279,9.基金项目
国家自然科学基金项目(51477106)。 Project Supported by National Natural Science Foundation of China (51477106) （51477106）
