摘要
绝缘气体输运参数计算对于其绝缘灭弧性能和其他宏观物性研究具有重要意义。首先基于最小吉布斯自由能方法,获得了CF_(3)SO_(2)F混合气体在300~30000 K温度下的粒子组分。在粒子组分的基础上,采用Chapman-Enskog方法求解Boltzmann方程,计算了0.01~1 MPa压强范围内CF_(3)SO_(2)F混合气体的输运系数(电导率、热导率和黏滞系数),重点考察了气压、混合比例和缓冲气体类别对CF_(3)SO_(2)F混合气体输运参数的影响。结果表明:增大气压会抑制气体解离和电离反应,延缓升温过程对输运系数的影响;增大CF_(3)SO_(2)F混合比例则会直接影响体系主要粒子的相对含量,进而使解离和电离反应的温度发生变化,导致低温区的电导率和中高温区的黏滞系数增大,中高温区的热导率减小;与前两者相比,气体混合类别对输运参数影响较小。此外,相比SF_(6),CF_(3)SO_(2)F混合气体具有更大的热导率和更小的黏滞系数,能够更有效地将焦耳热传递到电弧外从而避免弧后击穿。该研究不仅为CF_(3)SO_(2)F混合气体用于高压电气设备提供一定的指导,也为进一步评估其绝缘和灭弧能力及绝缘气体配置优化提供了必要的数据支撑。
The transport parameter calculation of insulating gas is of great significance for the study of its insulation and arc extinguishing performance and other macroscopic physical properties.Firstly,the particle composition of CF_(3)SO_(2)F gas mixture under 300~30000 K was obtained by means of the Gibbs free energy minimization method.On the basis of the particle composition,the Chapman-Enskog method was adopted to solve the Boltzmann equation to obtain the transport coefficients(such as electrical conductivity,thermal conductivity,and viscosity coefficient)of CF_(3)SO_(2)F gas mixture under the pressure range of 0.01~1 MPa.Meanwhile,we mainly focused on the effects of air pressure,mixing ra-tio and buffer gas type on the transport parameters of CF_(3)SO_(2)F gas mixture.The results show that increasing the pressure will suppress the gas dissociation and ionization reactions and delay the effect of temperature ramping process on the transport coefficients.While,increasing the CF_(3)SO_(2)F ratio can directly affect the relative content of the main particles in the system,which will lead to temperature variations for the dissociation and ionization reactions and will further increase the electrical conductivity within the low-temperature region and the viscosity coefficient within the medium-to-high temperature region,anddecrease the thermal conductivity within the medium-to-high temperature region.However,in contrast to the former two factors,the gas mixture category exhibits an inapparent influence on the transport parameters.Additionally,CF_(3)SO_(2)F gas mixture shows larger thermal conductivity and smaller viscosity coefficient than SF_(6),which will transfer Joule heat outside the arc more effectively and avoid post-arc breakdown.The research not only offers guid-ance for the utilization of CF_(3)SO_(2)F gas mixture in high-voltage electrical equipment,but also provides necessary data for further evaluation of its insulation and arc extinguishing capability,as well as optimization of insulating gas configuration.
作者
王安阳
柯学
颜湘莲
郭宇铮
王雯
王俊
WANG Anyang;KE Xue;YAN Xianglian;GUO Yuzheng;WANG Wen;WANG Jun(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第9期4261-4271,共11页
High Voltage Engineering
基金
国家重点研发计划(2021YFB2401400)。
