Study on the Mechanism of Silicone Grease on Electrical Tree Degradation of Silicone Rubber

被引：0
作者：
Yan Z. [1 ]
Yang K. [2 ]
Wang S. [2 ]
Li J. [2 ]
机构：
[1] State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan, 430074, Hubei Province
[2] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 02期
关键词：
Crosslinking density; Electrical tree; Free volume; Silicone grease; Silicone rubber;
D O I：
10.13334/j.0258-8013.pcsee.180474
中图分类号：
学科分类号：
摘要：
Electrical tree degradation is one of the main reasons for the decline of insulation performance or even failure of silicone rubber based cable accessories. During the installation of cable accessory, the interface between cable accessory insulation and cable insulation is usually coated by silicone grease. However, the influence of silicone grease on electrical tree degradation is not fully understood. The effect of silicone grease on the electrical tree degradation characteristics of SR was studied in the paper. The results showed that, due to the silicone grease, the electrical tree initiation voltage decreased from 13.5kV to 10.8kV, while the pattern of the electrical tree changed from branch type to bush type. Further analysis were carried out by trap charge characteristic, thermal decomposition analysis and crosslinking density measurement. It was suggested that the break of physical crosslinking and molecular chain caused by silicone grease led to the decline of crosslinking density as well as the increase of free volume and charge mobility. Therefore, due to increased free volume, higher energy of injected charges can be achieved, which consequently led to more broken chains in silicon rubber and eventually a lower electrical tree initiation voltage. At the same time, the charges can also be accelerated to break the molecular chains under weak radial electric field in a larger free volume. Therefore, the pattern of electrical tree was changed from branch type to bush type. © 2019 Chin. Soc. for Elec. Eng.
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页码：604 / 611
页数：7
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