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High quality sf6 cf4 gas mixtures CANADA

High quality sf6 cf4 gas mixtures CANADA

COLD-WEATHER APPLICATION OF GAS MIXTURE (SF6/N2, GAS MIXTURE (SF 6/N 2, SF 6/CF 4) CIRCUIT BREAKERS: A UTILITY USER’S PERSPECTIVE R. L. Middleton, P. Eng. Manitoba Hydro, Winnipeg, Canada SUMMARY Very low temperatures stress a circuit breaker in a complex manner. Mixed-gas circuit breakers were developed for use at temperatures as low as -50oC. These breakers utilize a gas mixture of SF 6.

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