电器与能效管理技术Issue(1)：50-55,6.DOI:10.16628/j.cnki.2095-8188.2025.01.009
SF6/N2混合气体隔离开关的小电流开断特性仿真研究
Simulation Study on Low Current Interruption Performance of SF6/N2 Gas Mixture Disconnector
摘要
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.关键词
SF6/N2混合气体/隔离开关/磁流体动力学/灭弧性能/开断速度Key words
SF6/N2 gas mixture/disconnector/magneto-hydro-dynamics(MHD)/arc extinguishing performance/breaking speed分类
动力与电气工程引用本文复制引用
李欣,陈沛龙,朱石剑,欧阳泽宇,钟尧,王邸博..SF6/N2混合气体隔离开关的小电流开断特性仿真研究[J].电器与能效管理技术,2025,(1):50-55,6.基金项目
贵州电网有限责任公司科技计划项目(GZKJXM20252057) （GZKJXM20252057）
