SF_(6)/N_(2)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 SF_(6)/N_(2)Gas Mixture Disconnector

作　　者：李欣 陈沛龙 朱石剑 欧阳泽宇 钟尧 王邸博 LI Xin;CHEN Peilong;ZHU Shijian;OUYANG Zeyu;ZHONG Yao;WANG Dibo(Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [2]南方电网科学研究院有限责任公司,广东广州510000

出　　处：《电器与能效管理技术》2025年第1期50-55,共6页Electrical & Energy Management Technology

基　　金：贵州电网有限责任公司科技计划项目(GZKJXM20252057)。

摘　　要：为验证SF_(6)/N_(2)混合气体应用于隔离开关的灭弧可靠性,针对252 kV隔离开关开断母线转移电流过程,建立电弧磁流体动力学(MHD)模型,仿真研究SF_(6)气体和SF_(6)/N_(2)混合气体在不同气体配比、不同开断速度下的燃弧过程。同时建立弧后电击穿评估模型,通过计算电流过零后100μs内的临界击穿电压,定量研究SF_(6)/N_(2)混合气体的浓度、隔离开关的开断速度对灭弧性能的影响规律。研究结果表明,28%SF_(6)+70%N_(2)混合气体具有较好的燃弧性能与弧后击穿特性,可以实现对SF_(6)气体的替代。开断速度的提升能够进一步提升混合气体恢复强度,但对隔离开关操动机构提出更高要求。To verify the reliability of SF_(6)/N_(2)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 SF_(6)and SF_(6)/N_(2)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 SF_(6)/N_(2)gas mixture concentration and breaking speed on the arc extinguishing performance was quantitatively studied.The results show that 28%SF_(6)+70%N_(2)gas mixture has good arc burning performance and back-arc breakdown characteristics,which can realize the replacement of SF_(6)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：SF_(6)/N_(2)混合气体 隔离开关 磁流体动力学 灭弧性能 开断速度 

分 类 号：TM564.1[电气工程—电器]