In this paper, the dielectric properties of CO2, CO2/air, CO2/O2, CO2/N2, CO2/CF4, CO2/CH4, CO2/He, C02/H2, CO2/NH3 and CO2/CO were investigated based on the Boltzmann equation analysis, in which the reduced critical ...In this paper, the dielectric properties of CO2, CO2/air, CO2/O2, CO2/N2, CO2/CF4, CO2/CH4, CO2/He, C02/H2, CO2/NH3 and CO2/CO were investigated based on the Boltzmann equation analysis, in which the reduced critical electric field strength （E/N）cr of the gases was derived from the calculated electron energy distribution function （EEDF） by solv- ing the Boltzmann transport equation. In this work, it should be noted that the fundamental data were carefully selected by the published experimental results and calculations to ensure the validity of the calculation. The results indicate that if He, H2, N2 and CH4, in which there axe high ionization coefficients or a lack of attachment reactions, are added into CO2, the dielectric properties will decrease. On the other hand, air, O2, NH3 and CFa （ranked in terms of （E/N）cr value in increasing order） have the potential to improve the dielectric property of CO2 at room temperature.展开更多
以纳米SiO2改性环氧树脂制得SiO2/环氧树脂复合材料,并对改性前后环氧树脂复合材料的短时过电压耐受能力进行对比研究。结果表明:随着纳米SiO2掺杂量的增加,SiO2/环氧树脂复合材料的介电常数和介质损耗因数均呈先减小后增大的趋势,当纳...以纳米SiO2改性环氧树脂制得SiO2/环氧树脂复合材料,并对改性前后环氧树脂复合材料的短时过电压耐受能力进行对比研究。结果表明:随着纳米SiO2掺杂量的增加,SiO2/环氧树脂复合材料的介电常数和介质损耗因数均呈先减小后增大的趋势,当纳米SiO2质量分数为3%时,改性效果最佳。根据U-N曲线,在常温下施加的雷电冲击电压幅值为50 k V时,掺杂SiO2质量分数为3%的环氧树脂复合材料累积至击穿的雷电冲击次数达1313次,是纯环氧树脂材料的3.23倍,研究结果可为提高环氧树脂短时过电压耐受能力设计提供参考。展开更多
基金supported in part by the National Key Basic Research Program of China(973 Program)(No.2015CB251002)the Science and Technology Project Funds of the Grid State Corporation of China(No.SGSNK00KJJS1501564)+2 种基金National Natural Science Foundation of China(Nos.51221005,51577145)the Fundamental Research Funds for the Central Universities of Chinathe Program for New Century Excellent Talents in University,China
文摘In this paper, the dielectric properties of CO2, CO2/air, CO2/O2, CO2/N2, CO2/CF4, CO2/CH4, CO2/He, C02/H2, CO2/NH3 and CO2/CO were investigated based on the Boltzmann equation analysis, in which the reduced critical electric field strength （E/N）cr of the gases was derived from the calculated electron energy distribution function （EEDF） by solv- ing the Boltzmann transport equation. In this work, it should be noted that the fundamental data were carefully selected by the published experimental results and calculations to ensure the validity of the calculation. The results indicate that if He, H2, N2 and CH4, in which there axe high ionization coefficients or a lack of attachment reactions, are added into CO2, the dielectric properties will decrease. On the other hand, air, O2, NH3 and CFa （ranked in terms of （E/N）cr value in increasing order） have the potential to improve the dielectric property of CO2 at room temperature.
文摘以纳米SiO2改性环氧树脂制得SiO2/环氧树脂复合材料,并对改性前后环氧树脂复合材料的短时过电压耐受能力进行对比研究。结果表明:随着纳米SiO2掺杂量的增加,SiO2/环氧树脂复合材料的介电常数和介质损耗因数均呈先减小后增大的趋势,当纳米SiO2质量分数为3%时,改性效果最佳。根据U-N曲线,在常温下施加的雷电冲击电压幅值为50 k V时,掺杂SiO2质量分数为3%的环氧树脂复合材料累积至击穿的雷电冲击次数达1313次,是纯环氧树脂材料的3.23倍,研究结果可为提高环氧树脂短时过电压耐受能力设计提供参考。
