SF_(6)/N_(2)混合气体断路器弧后击穿特性研究  

Study on Post Arc Breakdown Characteristics of SF_(6)/N_(2)Mixed Gas Circuit Breaker

作　　者：李金儒 李静[1] 刘树鑫[1] 李雪 LI Jinru;LI Jing;LIU Shuxin;LI Xue(Institute of New Electrical Technology,Shenyang University of Technology,Shenyang 110870,China;Baicheng Power Supply Company of State Grid Jilin Electric Power Co.,Ltd.,Baicheng 137099,China)

机构地区：[1]沈阳工业大学电器新技术研究所,辽宁沈阳110870 [2]国网吉林省电力有限公司白城供电公司,吉林白城137099

出　　处：《电器与能效管理技术》2023年第4期8-14,共7页Electrical & Energy Management Technology

基　　金：国家自然科学基金项目(51977132);辽宁省科厅资助项目(2020JH/10100012);辽宁省教育厅资助项目(LJKZ0126)。

摘　　要：以SF_(6)和SF_(6)/N_(2)混合气体为研究对象,建立交流电源、单一喷口、固定电极条件下的电弧模型。通过结合Mayr电弧模型的方法研究替代气体断路器弧后热击穿特性;采用两项近似法求解玻尔兹曼方程,计算混合气体临界击穿场强并与替代气体断路器模型实际场强比较,研究弧后电击穿特性。研究结果表明,在SF_(6)/N_(2)混合气体中SF_(6)含量较高时弧后击穿特性表现与纯SF_(6)气体断路器弧后击穿特性表现比较接近,说明其基本具备SF_(6)气体的弧后击穿特性,可以实现对于SF_(6)气体的替代,为SF_(6)替代气体断路器的研发提供理论依据,对于替代气体断路器重击穿问题的研究也具有参考价值。Taking SF_(6)and SF_(6)/N_(2)gas mixture as the research object,the arc model under the condition of AC power supply,single nozzle and fixed electrode is established.The post arc thermal breakdown characteristics of substitute gas circuit breakers are studied by combining Mayr arc model.The Boltzmann equation is solved by using the two-term approximation method,and the critical breakdown field strength of mixed gas is calculated and compared with the actual field strength of the substitute gas circuit breaker model.The results show that when the SF_(6)content in the SF_(6)/N_(2)mixed gas is high,the performance of the post arc breakdown characteristics is close to that of the pure SF_(6)gas circuit breaker.It basically has the post arc breakdown characteristics of SF_(6)gas and can realize the replacement of SF_(6)gas,which provides the theoretical basis for the research and development of SF_(6)substitute gas circuit breaker,and has reference value for the research on the re-breakdown problem of the substitute gas circuit breaker.

关 键 词：SF_(6)/N_(2)混合气体 热击穿 电击穿 电弧模型 临界击穿场强 

分 类 号：TM561[电气工程—电器]