500kV变压器段间雷电冲击试验模型的实现与电场的数值分析

The Realization of Section to Section Insulated Models of 500kV Transformers for Lightening Impulse Voltage Test and Numerical Analysis of the Electrical Fields

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的关心区域内的电场与电场分布的比较，提出一种500kV变压器段间绝缘雷电冲击试验模型的简化方案，经对绝缘试验模型的电场数值分析，得出由段间固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。

A realistic simplified method for the models of section to section insulation of 500kV power trans formers tested by Lightening impulse voltage was propoied,by means of comparing the differences of electrical fields in the concerned district caused by lightening impulse voltage in section to section insulated models of 500kV power transformers,the electrical fields were calculated with two dimen-sional finite element method. After the calculation,the maximum density of electri-cal field existing in section to section area was found in the cuneiform oil gap formed by trams former oil and solid insulating materials.