Then virtual dielectric constant method is adopted to calculate the electric field distribution with floating electrodes, and equivalent conductance rate method is adopted to calculate the electric field distribution with surface filth or local puncture in the insulator, furthermore the value scope of virtual conductance rate and equivalent conductance rate are discussed and some useful results are got . for the solution of vortex loss of silicon steel sheets concerning current transformer, the h solution has also been put forward rather than traditional a ? ( p method in order to reduce calculation load 采用虛擬介電常數(shù)法計算絕緣子存在懸浮導體的電場分布,采用等效電導率法計算絕緣子存在表面污穢或局部擊穿情況下的電場分布。對虛擬介電常數(shù)和等效電導率的取值范圍進行了討論,得出了一些有用的結論。對于電流互感器硅鋼片渦流損耗的計算,本文提出了不同于傳統(tǒng)的a-方法的h求解辦法,從而大大簡化了計算。