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Hot gas flow analysis in SF6 gas circuit breaker during the short circuit interruption

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5 Author(s)
Yoshizumi, T. ; Mitsubishi Electr. Co., Amagasaki, Japan ; Ibuki, K. ; Hosomi, M. ; Yonezawa, T.
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Characteristics of the hot gas flow in an SF6 gas circuit breaker during short-circuit interruption are investigated both experimentally and theoretically, to achieve a more efficient design and to obtain a better way of evaluating circuit-breaker performance. The discharge voltages of small gaps in the actual circuit breaker were measured. The results indicate that the thermodynamic characteristics in the dissociation process of SF6 molecule affect the behavior of the hot gas flow, even outside of the interrupter chamber. The effect of SF6 dissociation cannot be neglected even in a wide space in EHV circuit breakers. A program to simulate transient compressible fluid flows was developed. The applicability of this program is proved by the experimental results

Published in:

Power Delivery, IEEE Transactions on  (Volume:4 ,  Issue: 3 )

Date of Publication:

Jul 1989

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