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 采用虚拟介电常数法计算绝缘子存在悬浮导体的电场分布，采用等效电导率法计算绝缘子存在表面污秽或局部击穿情况下的电场分布。对虚拟介电常数和等效电导率的取值范围进行了讨论，得出了一些有用的结论。对于电流互感器硅钢片涡流损耗的计算，本文提出了不同于传统的a -方法的h求解办法，从而大大简化了计算。
