【摘要】 为探讨瓷三伞绝缘子表面积污规律,以XSP-160型瓷三伞绝缘子为研究对象,利用COMSOL模拟了其风洞条件下的积污特性,并与风洞试验结果进行了对比,结果验证了此方法的可行性。藉此,用该方法研究了该绝缘子自然条件下的积污特性与沿伞裙积污分布规律。结果表明:绝缘子表面积污直交比随风速增大而减小,随粒径增大而增加;与交流电和不带电情况相比,直流电作用下其表面整体积污量及其增长速度更大、更快,而前两种情况下,积污量相当,且基本不随粒径变化;小风速大粒径直流电作用下的绝缘子沿伞裙表面积污量呈不规则"U"形分布;随风速增大、粒径减小,"U"形分布特性逐渐消失。更多还原

【Abstract】 In order to investigate the pollution accumulation rule on the surface of three umbrella porcelain insulators.Using COMSOL,a simulation of the pollution accumulation characteristics of the XSP-160 Porcelain Three Umbrella Insulators was conducted in the wind tunnel at North China Electric Power University,and the simulation results were compared with the results from the wind tunnel test conducted at the campus. The verification results confirm the rationality of the simulation method. Based on these results,the natural contamination characteristics of the insulator and the distribution of pollution along umbrella skirt were analyzed by this method. The results show that the propportion of NSDDDCto NSDDACon the insulator surface decreases as the wind speed increases,and increases with increasing particle size. Compared with AC voltage and the unelectrified state,DC voltage leads to a greater overall deposition of contaminants on the insulator surface and a faster rate of increase. However,the values of the deposition under AC voltage and the unelectrified state are similar,they essentially do not change with increasing particle size. In the small wind speed or large particle size,the deposition along umbrella groups has a irregular "U"type distribution under DC condition.With the increase of wind speed or the decrease of particle size,the feature of " U" type distribution gradually disappear.更多还原