步进电压下变压器匝间绝缘电压寿命指数新解法

New Solving Method for Voltage Endurance Coefficient N of Transformer Turn-to-turn Insulation under Step-voltage

针对在进行步进电压下的变压器匝间绝缘加速电老化试验时,采用传统方法求解反幂模型的电压寿命指数N比较繁琐的问题,提出了一种新的求解方法 .进行了步进电压下500 k V电力变压器的匝间绝缘模型线圈的加速电老化试验,利用所提的方法算出了模型线圈的反幂模型寿命公式,并通过恒定电压试验验证了该模型的正确性.结果表明,本文所提出的新算法,可以用于步进电压下变压器匝间绝缘反幂模型中电压寿命指数N的求解,该方法较传统方法简单.

For the accelerated electrical ageing test of transformer turn-to-turn insulation under the step-stress voltage, it is a complicated problem when the traditional method was taken to calculate the voltage endurance coeffi- cient N of inverse power model. A new solving method was proposed. The accelerated electrical ageing test of trans- former turn-to-turn insulation under the step-stress voltage of 500 kV was carried on. The power model formula of inverse power model was calculated using the proposed method, and the correctness was verified by constant voltage test. The result shows that the new method can be used to calculate the voltage endurance coefficient N of trans- former turn-to-turn insulation under the step-stress voltage, and the new method is simpler than the traditional method.