基于碰撞电离理论的污秽及环境因素对导线起晕电压的影响分析

Influence of Dirt&Environmental Factors Upon Corona Initiation Voltage Based on Collision Ionization Theory

架空输电线路上附着的污秽是影响电晕的重要因素,并且不同地区的环境因素差异也会对电晕产生影响。针对污秽和环境因素对导线起晕电压的影响,以碰撞电离理论以二次电子崩正离子数是否大于初始电子崩正离子数作为起晕判据,采用数值计算方式建立仿真模型对其影响进行系统分析。结果表明:导线上污秽的存在影响导线附近空间电场分布并对起晕电压造成影响,电场强度下降时起晕电压上升,气压上升时起晕电压上升,温度或湿度上升时起晕电压下降。

Filth attached to overhead transmission lines is an important factor affecting corona,and the difference of environmental factors in different regions also affects corona.In view of the influence of dirt and environmental factors on conductor corona voltage,based on the collision ionization theory,the corona criterion is whether the number of secondary electron collapsing positive ions is greater than the number of initial electron collapsing positive ions,and the simulation model is established by numerical calculation.The results show that the presence of dirt on the conductor affects the electric field distribution in the space near the conductor and affects the corona voltage,the corona voltage rises when the electric field strength decreases,the corona voltage rises when the barometric pressure rises,and the corona voltage decreases when the temperature or humidity rises.