交流电场下导体表面接触角对水滴振动、放电特性的影响

Effect of contact angle of conductor surface on the vibrationand discharge characteristics of water dropsunder AC electric field

现有电力系统中对不同接触角下线路导体表面水滴动态过程的研究并不全面,特别是缺乏水滴动态过程与空间电场畸变关系的定量研究。为此,通过有限元仿真模拟,分析了“固-液”表面接触角对水滴振动规律和空间电场分布的影响,推导出交流电场下导体表面振动水滴的频率、相位、场强分布与表面接触角的联系。仿真结果表明:水滴的振动频率是交流电压频率的2倍,振动相位滞后于交流激励相位,且与接触角没有直接的关系;表面接触角影响振动水滴的形态轮廓,接触角越低,附着水滴对空间电场强度的畸变程度越小。

Under humid weather conditions,water droplets attached to the surface of overhead lines can cause distortions in the electric field near the conductors,resulting in more corona discharge events and bringing more serious electromagnetic environmental problems.The existing work lacks a comprehensive study of the dynamic process of water droplets on the surface of line conductors at different contact angles,especially a quantitative study of the relationship between the dynamic process of water droplets and the distortion of the electric field in space.To address this problem,we analyze the influence of the“solid-liquid”surface contact angle on the droplet vibration law and the spatial electric field distribution through finite element simulation,and derive the connection between the frequency,phase,field distribution and surface contact angle of the droplet vibrating on the conductor surface under the AC electric field.The simulation results show that the vibration frequency of water droplets is twice of the AC voltage frequency,the vibration phase lags behind the AC excitation phase,and there is no direct relationship with the contact angle;the surface contact angle affects the morphological profile of the vibrating water droplets,and the lower the contact angle,the smaller the distortion of the attached water droplets to the spatial electric field intensity.