Current Assessment of Research on Insulating Gas Mixtures and Their Potential for Industrial Applications

摘要

Since no single gas can meet all of the multiple needs and operating conditions that exist in power apparatus, mixtures have been studied with the goal of tailoring the dielectric for a specific application by exploiting the properties of the component gases. This report reviews research results on dielectric gas mixtures and assesses the potential of such mixtures for industrial applications. Topics include electrical breakdown characteristics, physical and chemical properties, and economics. There are several mixtures which show promise. For example, 50%/50% SF sub 6 /N sub 2 exhibits the same dielectric strength as 100% SF sub 6 but at approx. 35% lower cost when operated at 15% higher pressure. At 30%/40%/30%, c-C sub 4 F sub 8 /SF sub 6 /N sub 2 permits a 10% reduction in transmission line enclosure costs at the same voltage with a potential savings of more than $300,000/km. (ERA citation 09:016313)