浅谈绝缘气体在气体绝缘输电线路(GIL)中的应用

Brief Discussion on the Application of Insulating Gas in Gas Insulated Transmission Line(GIL)

近十年中国高速铁路发展迅速,目前主要采用传统架输电线路对铁路牵引变电所进行供电,可以考虑采用GIL(gas insulated transmission line)取代传统架空线路对铁路牵引变电所进行供电。本文首先介绍了GIL的基本特点,说明了GIL相比传统输电线路和电缆输电线路的优势。随后,详细描述了GIL绝缘气体发展历程,第一代GIL绝缘气体为SF6,第二代GIL绝缘气体为SF6/N2混合气体,第三代绝缘气体为压缩空气、C4F7N/CO_(2)混合气体或者CF3I。最后,列举了绝缘气体在国内外GIL项目中应用的具体案例。

In recent ten years,China’s high-speed railway has developed rapidly.At present,the traditional overhead transmission lines are mainly used to supply power to railway traction substations.GIL can be considered to replace traditional overhead transmission lines to supply power to railway traction substations.Firstly,this paper introduces the basic characteristics of GIL,and explains the advantages of GIL compared with traditional overhead transmission lines and cable transmission lines.Then,the development process of GIL insulation gas is described in detail.The first generation of GIL insulation gas is SF6,the second generation of GIL insulation gas is SF6/N2 mixture gas,and the third generation of GIL insulation gas is compressed air,C4F7N/CO2 mixture gas or CF3I.Finally,the application cases of insulating gas in GIL project at home and abroad are listed.