摘要详情

ID / 提交时间

275 / 2024-08-02 14:50:07

标题

full paper

关键字

SF6 alternative gas, MHD, arc temperature, voltage

主题及专题

5)Switching phenomena in ultra-high voltage systems

状态

终稿

作者

le li / Shenyang University of Technology

Zhenxin Geng / Shenyang University of Technology

摘要

The impact of SF₆gas, which is widely used in the power industry, on environmental issues cannot be ignored. The C₄F₇N gas mixture, with its unique advantages, has emerged as a promising alternative to SF₆ gas. Further research on its arc characteristics is significant for the development of new gas switchgear. Based on the theory of magnetohydrodynamics (MHD), the dynamic process of AC arc discharge in the rod-rod electrode gap is simulated. The short-circuit current interruption process of C₄F₇N gas mixtures with C₄F₇N ratios of 7%, 10%, 20% and pure SF₆ under 0.3MPa is calculated separately. The influence of different ratios on the arc characteristics is analyzed and compared with pure SF₆ gas. The research results show that the axial diffusion ability of C₄F7N/CO₂ gas mixture is stronger than that of pure SF₆ gas, and the axial diffusion becomes more obvious with the increase of C₄F₇N proportion. The arc voltage of C₄F₇N/CO₂ gas mixture is higher than that of pure SF6 gas, and the gap gradually widens as the C₄F₇N proportion increases. The conductivity of SF₆ arc is greater than that of C₄F₇N/CO₂ gas mixture, and there is no significant change with the increase of C₄F₇N, indicating that the arc stability of SF₆ is better than that of C₄F₇N/CO₂ gas mixture.