基于一维电弧模型的SF_(6)混合气体灭弧性能评价  

Evaluation of the interruption capability of SF_(6) gas mixtures based on one-dimensional arc model

作　　者：顾琦 仲林林 GU Qi;ZHONG Linlin(School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学电气工程学院,江苏南京210096

出　　处：《电力工程技术》2022年第6期140-146,共7页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51907023)。

摘　　要：SF_(6)混合气体是广受关注的SF_(6)替代气体方案之一。为定量评估SF_(6)混合气体的灭弧性能,文中采用一维衰减电弧模型和玻尔兹曼方程相结合的方法,将电弧熄灭过程划分为热恢复阶段、弧前介质恢复阶段和弧后介质恢复阶段,分别引入热恢复率、弧前介质恢复率和弧后介质恢复率作为各阶段的评价参数,并计算三者的调和平均数作为综合评价参数,以此来评估SF_(6)-N_(2)、SF_(6)-CO_(2)、SF_(6)-CF_(4)以及SF_(6)-Air混合气体的灭弧性能。基于上述方法,文中初步探讨SF_(6)含量、背景气体种类和压强大小对SF_(6)混合气体灭弧性能的影响。结果表明,随着SF_(6)含量的减少,混合气体的灭弧性能整体上呈现下降趋势;当SF_(6)含量为10%~50%时,4种混合气体中SF_(6)-N_(2)的灭弧性能最优,其次分别为SF_(6)-Air、SF_(6)-CO_(2)和SF_(6)-CF_(4)。SF_(6) gas mixture is one of the popular SF_(6) alternatives.For the purpose of quantitatively evaluating the arc extinguishing performance of SF_(6) mixtures,one-dimensional arc decaying model and Boltzmann equation are combined to divide the whole arc extinguishing process into thermal recovery stage,pre-dielectric recovery stage and post-dielectric recovery stage,which are evaluated by three parameters,namely thermal recovery rate,pre-dielectric recovery rate and post-dielectric recovery rate,respectively.The harmonic mean of the above three parameters is calculated as the harmonic average recovery rate to evaluate the arc extinguishing performance of SF_(6)-N_(2),SF_(6)-CO_(2),SF_(6)-CF_(4) and SF_(6)-Air mixtures.Based on the proposed method,the effects of SF_(6) proportion,buffer gas type and gas pressure on the interrupting performance of the SF_(6) mixtures are preliminarily investigated.The results show that the overall arc quenching ability of the gas mixtures presents a decreasing trend as the lowering of SF_(6) proportion.Among the four gas mixtures with SF_(6) proportion ranging from 10%to 50%,the SF_(6)-N_(2) gas mixture has the best interrupting performance,followed by SF_(6)-Air,SF_(6)-CO_(2),and SF_(6)-CF_(4) successively.

关 键 词：SF_(6)替代气体 SF_(6)混合气体 电弧 灭弧性能 一维衰减电弧模型 玻尔兹曼方程 

分 类 号：TM561[电气工程—电器]