车顶绝缘子动态覆冰及其闪络特性OA

The roof insulators are prone to ice accumulation since they are exposed to harsh environments for extended periods,which poses a threat to the operation safety of trains.As a result,there is an urgent need for systematic re-search on their dynamic ice accumulation and flashover characteristics.In this paper,an ice accumulation test platform capable of simulating the constant wind speed conditions was constructed to simulate the ice accumulation process at dif-ferent ambient temperatures.In addition,flashover tests were conducted to collect the data on flashover arc develop-ment and voltage.Meanwhile,a finite element electric field simulation model of an insulator under ice accumulation conditions was developed,so as to analyze the influences of various ice accumulation forms on the distribution of sur-face electric field.Results indicate that ambient temperature significantly affected the ice growth and ultimately led to differences in flashover characteristics.Combined with simulations,the electric field distortion characteristics corre-sponding to different ice accumulation characteristics were also identified.The findings in this paper can provide data support and model reference for ensuring the operation safety of high-speed trains and anti-ice accumulation efforts un-der severe environmental conditions.