基于带电颗粒动态积污的绝缘子电场分布研究

Research on Electric Field Distribution of Insulators Based on Dynamic Pollution Accumulation of Charged Particles

为了研究带电污秽颗粒对绝缘子表面积污、电场分布的影响及空气域电晕放电现象,以FXBW-35/70绝缘子为研究对象,采用多物理场耦合有限元软件Comsol Multiphysics搭建了AC-DC、湍流、带电颗粒相互作用及颗粒运动的耦合风洞模型,进行了带电颗粒对绝缘子表面积污、电场和空气域电晕放电分布研究。结果表明:风速越大,迎风区积污速度快于其他区面;粒径增大时,迎风面积污严重,背风区积污很小,侧风区基本无变化;染污中迎风区伞裙表面的电位和电场畸变最为严重,背风区次之,染污后伞裙表面电位、电场有所缓和,迎风区较背风区严重;染污中,靠近高压端和低压端的一大一小伞裙周围空气域存在电晕放电风险,且在靠近高、低压端第一片大伞裙会发生电晕放电;染污后,靠近低压端的大伞裙根部1 mm范围、靠近高压端的整个大伞裙周围和小伞裙根部存在电晕放电风险。

For studying the influence of charged pollution particles on the surface pollution and electric field distribution of insulators as well as the corona discharge phenomenon in the air domain,the FXBW-35/70 insulator is taken as the study object,the coupling wind tunnel model of AC-DC,turbulence,charged particle interaction and particle motion is constructed by using the multi-physics coupling finite element software Comsol Multiphysics,and the distribution of corona discharge by charged particles on the surface of insulators,electric field and air domain is studied.The result shows that the higher the wind speed,the faster the pollution accumulation speed in the windward area compared to other areas,the larger the particle size,the more severe the pollution in the windward area,the less pollution in the leeward area,and the little change in the crosswind area.The surface potential and electric field distortion of the shed in the windward area are the most severe during pollution,followed by the leeward area.After pollution,the surface potential and electric field of the shed have eased,and the windward area is more severe than the leeward area.During the pollution,there is a risk of corona discharge in the air around a large and small shed near the high-voltage and low-voltage ends,and the first large shed near the high-voltage and low-voltage ends will experience corona discharge.After the pollution,there is a risk of corona discharge within 1mm at the root of large shed of low voltage side,and also round the whole large shed of the high voltage side as well as the root of the small shed.