Abstract
In northern China, very low temperatures stress a circuit breaker in a complex manner. In recent years, we develop mixed-gas circuit breakers utilizing SF6 gas mixtures (SF6/CF4 or SF6/N2) which offer excellent cold-weather performance at temperature as low as -45 °C. The performance of SF6 gas mixtures is different upon the partner of SF6 gas and the gas ratio of the mixtures. We utilized different SF6 gas mixtures in circuit breakers at different system voltages in different areas. Unlike pure SF6 gas, handling and recycling SF6 gas mixtures is a complex job, and it is in urgent need of an outline of handling and recycling SF6 gas mixtures since more and more SF6 gas mixtures insulated equipment are in service. In this paper, we introduce the situation of mixed-gas circuit breakers at different system voltage, and present how to handle and recycle SF6 gas mixtures while the mixed-gas circuit breakers are out of use.
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