【摘要】 应用二维四节点有限元电场数值分析的方法，通过对５００ｋＶ电力变压器段间绝缘雷电冲击试验模型关心区域内电场分布的比较，提出了一种５００ｋＶ变压器段问绝缘雷电冲击试验模型的简化方案，并对该简化试验模型进行了雷电冲击试验．经过试验模型的电场数值分析，得出了由段间团体绝缘材料与变压器油形成的油楔中会出现段间最大电场强度的结论．通过雷电冲击试验，得５０％击穿电压、最小击穿电压与试验模型的匝绝缘厚度、段间油隙尺寸间的关系曲线．更多还原

【Abstract】 A valid section to section insulation model of 500 kV transformer for lighteningimpulse voltage test is proposed by analyzing the electric field with two dimensional finite element method. The insulation of the model is tested by means of simulated lightening impulse voltage. The result shows that the maximum density of electric field existing in the section to sectionarea is found in the wedged oil gap formed by transformer oil and solid insulating materials.Some curves of the relationship between breakdown voltages (50% breakdown voltage and minimum breakdown voltage) and structural dimensions of the model insulation(the thickness of turnto turn insulation and the distance of section to section insulation) are presented.更多还原