This paper studies the possibility of applying a gas mixture containing C-C4FS in the gas insu lation of power equipment. Environmental aspects such as global warming potential, ozone depletion potential, recycling loss and toxicity are discussed. Insulation characteristics of gas mixtures such as c-C4FslNz, c-C4Fg/air, and c-C4FsfCOz are examined experimentally under a quasi-homogeneous or an inhomogeneous electric field condition. Most of the characteristics are compared with those of SF6/Nz, which is now widely studied as the most plausible alter native to pure SF6 for gas insulation. The experimental results, together with the discussion, suggest that gas mixtures containing C-C4FS are possible substitutes for SF6 and SF6/N2•
A b s t r a c t -M e c h a n i s m a n d e f f e c t o f t h e d c c h a r g e a c c u m u l a t i o n on t h e s u r f a c e of a s o l i d i n s u l a t i n g s u p p o r t ( s p a c e r ) have been s t u d i e d i n compressed SF6 g a s , u s i n g v a r i o u s c y l i n d r i c a l model s p a c e r s . The d i s t r i b u t i o n of s u r f a c e c h a r g e has a close r e l a t i o n with t h e normal component ( g a s s i d e ) En of e l e c t r i c f i e l d on t h e s p a c e r s u r f a c e . The maximum charge d e n s i t y can be e s t i m a t e d from t h e c o n d i t i o n of En = 0.
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