改善高压电场环境下硅橡胶复合材料服役性能的基础研究

Silicone rubber composite insulator is the most advanced electrical insulator at present. However, the performance of the composite insulator could be reduced because of aging during the long-term operation, and eventually lead to pollution flashover accident. Large-area pollution flashover accident will result in serious security threat to the power system and cause great loss to the national economy. The surface corona discharge under high voltage electric field is the major cause of aging. Therefore, the external insulation material should have good service performance under high voltage electric field. In this proposal, from the materials design point of view, making full use of novel materials, we systematically study the effect of matrix types, fillers, and surface modification on the service performance of the silicone rubber composite, discuss the relationship between material structure and the surface corona discharge under high voltage electric field and the effect on corona-resistance performance. Our aim is to obtain the novel silicone rubber composite with good service performance by designing and optimizing the internal structure and surface characteristic, and to solve the problem of pollution flashover resulting from the aging of external insulation material. The proposal provide the theoretical direction for designing the novel silicone rubber composite used in outdoor insulator. Moreover, improving the service performance of silicone rubber composite under high voltage electric field plays an important role in preventing and controling the large area pollution flashover accident, and this research will benefit for improving the reliability of grid.

有机硅橡胶复合绝缘子是目前最新型的绝缘子，但是随着运行时间的延长，其性能会因老化而衰减，最终导致污闪事故的发生，大面积污闪会给电力系统带来严重安全威胁并给国民经济带来巨大损失。高压电场环境下的表面电晕放电是造成老化的主要原因，因此复合绝缘子的外绝缘材料在高压电场环境下应当具备优良的服役性能。本项目拟从材料设计角度出发，充分利用新材料，系统研究硅橡胶基体种类、填料以及表面改性对复合绝缘子用硅橡胶复合材料服役性能的影响，研究材料结构对高压电场环境下沿面电晕放电的影响及其与电晕老化性能间的关系，从材料内部结构和表面特性两方面入手，研究制备新型硅橡胶复合材料，使其具备优良的服役性能，从而解决目前硅橡胶复合绝缘子老化造成的污闪问题。本项目提出的改善高压电场环境下硅橡胶复合材料服役性能的基础研究，为新型复合绝缘子用硅橡胶复合材料的设计提供理论指导，对防治大面积污闪事故、提高电网运行可靠性具有重要意义。

有机硅橡胶复合绝缘子是目前最新型的绝缘子，但是随着运行时间的延长，其性能会因老化而衰减，最终导致污闪事故的发生，大面积污闪会给电力系统带来严重安全威胁并给国民经济带来巨大损失，因此复合绝缘子的外绝缘材料在高压电场环境下应当具备优良的服役性能。本项目从材料设计角度出发，充分利用新材料，系统研究硅橡胶基体种类、填料以及表面特性对复合绝缘子用硅橡胶复合材料服役性能的影响，从材料内部结构和表面特性两方面入手，研究制备新型硅橡胶复合材料，使其具备优良的服役性能，从而解决目前硅橡胶复合绝缘子老化造成的污闪问题。本项目提出的改善高压电场环境下硅橡胶复合材料服役性能的基础研究，为新型复合绝缘子用硅橡胶复合材料的设计提供理论指导，对防治大面积污闪事故、提高电网运行可靠性具有重要意义。