气体绝缘输电线路(GIL)的应用及发展

Application and Development of Gas Insulated Transmission Line(GIL)

文中介绍了GIL的发展历史和应用范围、特点,以及国内外GIL的应用状况,分析了第一代SF_6气体绝缘的GIL和第二代SF_6混合气体绝缘的GIL的运行情况,提出了采用SF_6体积分数10%~20%的混合气体绝缘的GIL作为第二代GIL的发展方向。指出了压缩空气绝缘不适用于高压及以上等级的GIL,提出了采用CF3I混合气体作为第三代GIL的研究发展方向。研究分析了CF3I混合气体的绝缘强度、液化温度和温室效应等特性,指出了CF3I与N_2混合气体可以作为超特高压GIL中SF_6的替代气体,在绝缘强度、液化温度和成本造价上都有较大的优势,可以对CF3I体积分数为10%~30%的混合气体进行可行性应用研究。

We introduce the development history and application scope, characteristics of gas insulated transmission line（GIL）, and GIL application status at home and abroad, and analyzed the application status of the first generation GIL using SF6 and the second generation GIL using SF6 gas mixtures. It is proposed to use 10%-20% SF6 gas mixtures as the development direction of the second generation GIL. We find that the insulation using the compressed air is not applicable for high voltage and above level GIL, and put forward that the CF3I gas mixtures are as the research and development direction of the third generation GIL. Studying the insulation strength, the liquid temperature and the greenhouse effect,we point out the CF3I and N2 mixed gas can be used as a replacement of SF6 gas in GIL, the CF3I gas mixtures has bigger advantages in the dielectric strength, liquefaction temperature and cost, and the CF3I gas mixtures of 10%-30%CF3I content are applicable in researching the feasibility.