利用流体动力学模型,对大气压条件下空气间隙的同轴电极结构进行了负极性电晕放电特性研究,获得了一组规则的特里切尔脉冲。除第一个脉冲外,其他脉冲的幅值均在1.5-2.5 m A。然后,对第一个脉冲（称为第一脉冲）不同发展阶段的空间电场...利用流体动力学模型,对大气压条件下空气间隙的同轴电极结构进行了负极性电晕放电特性研究,获得了一组规则的特里切尔脉冲。除第一个脉冲外,其他脉冲的幅值均在1.5-2.5 m A。然后,对第一个脉冲（称为第一脉冲）不同发展阶段的空间电场分布和粒子密度分布进行了描述,并讨论了第一脉冲与第二脉冲之间的死区时间内不同时刻负离子密度的变化过程及其对阴极表面电场的影响作用,最后,对第二脉冲发展前后空间电场分布、电子密度分布和负离子密度分布及其变化规律进行了进一步的描述。仿真表明,随着负离子在电场力的作用下逐渐向外迁移,导线表面电场强度开始恢复,但其恢复速度在负离子远离导线的过程中逐渐变缓。同时,当导线表面电场强度恢复至低于初始拉普拉斯场强的某一特定值时,新的脉冲就开始发生,第二脉冲发生时空间电场、电子密度及负离子密度的最大值均小于第一脉冲。展开更多
In this paper, the effect of polarity on the volume conductivity of Kapton and polyethylene (PE), determined using the corona triode method, when the sample current depends linearly on grid potential, was studied. For...In this paper, the effect of polarity on the volume conductivity of Kapton and polyethylene (PE), determined using the corona triode method, when the sample current depends linearly on grid potential, was studied. For the determination of volume conductivity, in addition to the analytical method, for the first time, a graphical method is presented as well. According to the experimental results, obtained by both methods, the volume conductivity values of negative corona charged samples were higher than those of the samples charged by positive corona. Considering the different nature of positive and negative coronas, these differences in results are to be expected and are in full accordance with the theoretical considerations as well. On the other hand, the good agreement between the analytical method results and those obtained by the graphical method, indicates high accuracy of the proposed analytical formula. Meanwhile, the satisfying accordance of experimental results with those found by the classical “static” and “dynamic” methods, confirms the accuracy of the corona method, for the determination of volume conductivity of polymers.展开更多
文摘利用流体动力学模型,对大气压条件下空气间隙的同轴电极结构进行了负极性电晕放电特性研究,获得了一组规则的特里切尔脉冲。除第一个脉冲外,其他脉冲的幅值均在1.5-2.5 m A。然后,对第一个脉冲（称为第一脉冲）不同发展阶段的空间电场分布和粒子密度分布进行了描述,并讨论了第一脉冲与第二脉冲之间的死区时间内不同时刻负离子密度的变化过程及其对阴极表面电场的影响作用,最后,对第二脉冲发展前后空间电场分布、电子密度分布和负离子密度分布及其变化规律进行了进一步的描述。仿真表明,随着负离子在电场力的作用下逐渐向外迁移,导线表面电场强度开始恢复,但其恢复速度在负离子远离导线的过程中逐渐变缓。同时,当导线表面电场强度恢复至低于初始拉普拉斯场强的某一特定值时,新的脉冲就开始发生,第二脉冲发生时空间电场、电子密度及负离子密度的最大值均小于第一脉冲。
文摘In this paper, the effect of polarity on the volume conductivity of Kapton and polyethylene (PE), determined using the corona triode method, when the sample current depends linearly on grid potential, was studied. For the determination of volume conductivity, in addition to the analytical method, for the first time, a graphical method is presented as well. According to the experimental results, obtained by both methods, the volume conductivity values of negative corona charged samples were higher than those of the samples charged by positive corona. Considering the different nature of positive and negative coronas, these differences in results are to be expected and are in full accordance with the theoretical considerations as well. On the other hand, the good agreement between the analytical method results and those obtained by the graphical method, indicates high accuracy of the proposed analytical formula. Meanwhile, the satisfying accordance of experimental results with those found by the classical “static” and “dynamic” methods, confirms the accuracy of the corona method, for the determination of volume conductivity of polymers.
