Simulation Study on Low Current Interruption Performance of SF6/N2 Gas Mixture Disconnector

doi:10.16628/j.cnki.2095-8188.2025.01.009

Abstract

Abstract:

To verify the reliability of SF₆/N₂ gas mixture applied to the disconnector,in view of the bus-transfer current interruption of 252 kV disconnector,a magneto-hydro-dynamics (MHD) arc model was built to simulate the arc burning process of the SF₆ and SF₆/N₂ mixture under different gas ratios and contact velocities.Meanwhile,a post-arc breakdown evaluation method was proposed by calculating the critical breakdown voltage within 100μs after the current is zero.Then the effect of SF₆/N₂ gas mixture concentration and breaking speed on the arc extinguishing performance was quantitatively studied.The results show that 28%SF₆+70%N₂ gas mixture has good arc burning performance and back-arc breakdown characteristics,which can realize the replacement of SF₆ gas.The increase of the breaking speed can further improve the recovery strength of the mixed gas,but it puts forward higher requirements for the operating mechanism of the disconnector.

Key words: SF₆/N₂ gas mixture, disconnector, magneto-hydro-dynamics (MHD), arc extinguishing performance, breaking speed

CLC Number:

TM564.1

LI Xin, CHEN Peilong, ZHU Shijian, OUYANG Zeyu, ZHONG Yao, WANG Dibo. Simulation Study on Low Current Interruption Performance of SF₆/N₂ Gas Mixture Disconnector[J]. LOW VOLTAGE APPARATUS, 2025, 0(1): 50-55.

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References 20

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Simulation Study on Low Current Interruption Performance of SF₆/N₂ Gas Mixture Disconnector

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