Cold-weather Application of Gas Mixture (sf6/n2, Sf6/cf4) Circuit Breakers: a Utility User’s Perspective
نویسنده
چکیده
Very low temperatures stress a circuit breaker in a complex manner. Mixed-gas circuit breakers were developed for use at temperatures as low as -50C. These breakers utilize a gas mixture of SF6 and CF4 or SF6 and N2 to prevent condensation of the SF6 gas and have been type tested at -50C to ensure travel characteristics, operating times, and gas tightness are acceptably affected. Today’s mixed-gas circuit breakers offer excellent cold-weather performance and provide the reliability needed for most utility users’ systems.
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