空间介质颗粒对交流导线电晕特性影响规律

为了研究空间介质颗粒对导线交流电晕特性的影响,基于小电晕笼,应用Fi Lin?6紫外成像仪记录存在介质颗粒时模拟导线交流电晕放电发生、发展的过程,实验结果表明:空间介质颗粒会对导线交流电晕发生、发展过程产生影响,球径越大、距离导线越近则导线的起晕电压越低;存在多球时,由于颗粒间的相互影响,导线的起晕电压和放电过程会受到影响,其中垂直排列的颗粒之间对放电发展过程和起晕电压影响相对较大。将偏心偶极子模型应用到存在介质颗粒时电场计算中,结合模拟电荷法对导线周围存在颗粒时空间电场分布进行分析,仿真结果表明:导线表面的最大场强以及导线和颗粒间场强的均值随着颗粒尺寸的增大、颗粒导线距离的降低和颗粒相对介电常数的增大而增大;空间存在多个颗粒时,由于球间的相互影响使导线表面场强进一步增大,其中球间连线和电场方向一致时的影响更大。

Influence of Space Dielectric Particle on AC Corona Discharge Characteristic of Conductor

The UV imager FiLin-6 together with the video recorder is used to study the influence of dielectric particles on the AC corona discharge characteristics of the conductors. The test results show that with the increase of test voltage, corona discharge first happens in the air space between the conductor and the particle, then a bright discharge path will form, finally if the test voltage is high enough, discharge will bypass the particle and go on developing. The larger the particle size and the smaller the distance between the particle and the conductor, the smaller the corona onset voltage will be. The onset voltage is lower than that in single particle condition. Compared with single particle condition, the left and right arrangement of two particles have more effects on the corona discharge process and onset voltage. The displaced dipole method is used to calculate the electric field strength combined with the charge simulation method. The calculation result shows that with the decrease of distance between particle and conductor, the particle size and the relative permittivity increase, meanwhile the maximum surface electric field strength and the average electric field strength between the conductor and the particles increase. The existing of multi-particles will further increase the surface electric field strength of the conductor, where the impacts of the particles in the same direction with the electric field strength are larger.