Influence of Large Shed Structure on Contamination Accumulation Characteristics of Composite Insulator

In order to explore the influence of changing large sheds in different parts on the pollution accumulation characteristics of composite insulators, three kinds of large shed structural models are constructed based on the original model of FXBW4-110/100 composite insulators. COMSOL Multiphysic is used to numerically simulate the fouling characteristics of four insulator models, and the differences in the distribution of flow field and electric field near them are compared and analyzed to explore the fouling laws under different wind speeds, particle sizes and voltage types. The results show that the flow field distribution near the composite insulator can be changed by installing a large umbrella skirt at an appropriate position. When the size of the large shed is relatively small and the number of pieces is small, the DC field strength distribution near the composite insulator is almost unchanged. Under the same particle size, the amount of fouling increases with the increase of wind speed; under the action of DC voltage, the large umbrella skirt is installed at the beginning and end of the composite insulator, which is the first model. At low wind speed, the pollution amount is 75%~95% of the original model, and with the increase of wind speed, the difference of pollution amount increases first and then decreases. Under the action of AC voltage, the amount of pollution in model one fluctuates up and down based on the original model; while the amount of pollution in model two and model three at 1~3 m/s is about 50%~90% of the original model. ©2023 Chin.Soc.for Elec.Eng.