中国电机工程学报2016，Vol.36Issue(24)：6627-6634,8.DOI:10.13334/j.0258-8013.pcsee.161831
机械应力下高温硫化硅橡胶电树枝生长特性
Treeing Growth Characteristics in HTV Silicone Rubber Considering Mechanical Stress
摘要
Abstract
To investigate the effects of mechanical stress on treeing growth characteristics in HTV silicone rubber under different pulse frequencies, electrical tree growth process was observed. The dependence of electrical tree characteristics on pulse frequency was analyzed. Moreover, the electrical tree propagation characteristics and mechanism were researched under different tensile strain and compressive strain. The results indicate that the tree initiation probability becomes higher with accelerating the propagation of the electrical tree when the tensile strain is increased. Furthermore, the accumulated damage of the treeing area is also enlarged as the tensile strain increasing, which aggravates the destruction for the insulation materials. However, when the compressive strain is increased, the tree initiation probability becomes lower with retarding the propagation of the electrical tree. The accumulated damage of the treeing area is also reduced as the compressive strain increasing, indicating the destruction for the insulation materials is restrained. The tree initiation probability is improved and the propagation of electrical tree is accelerated as pulse frequencies increasing regardless of the mechanical stress. When the sample is stressed under lower electric field, the tree channels are not instantly initiated and the tree initiation process can be distinctly divided into three stages; while the single tree channel is immediately generated after the higher electric field is applied on the samples. In the paper, the relationship between the electrical tree and mechanical stress is established, which provides a reference for the stress control analysis of the cable accessories.关键词
机械应力/硅橡胶/电树枝/分形维数/累积损伤Key words
mechanical stress/silicone rubber/electrical tree/fractal dimension/accumulated damage分类
信息技术与安全科学引用本文复制引用
杜伯学,苏金刚,徐航,韩涛..机械应力下高温硫化硅橡胶电树枝生长特性[J].中国电机工程学报,2016,36(24):6627-6634,8.基金项目
国家自然科学基金(51277131，51537008)；国家重点基础研究发展计划(973计划)(2014CB239506)。 The National Natural Science Foudation of China(51277131,51537008) （51277131，51537008）
The National Basic Research Program of China (Program 973)(2014CB239506) （Program 973）
