基于材料绝缘寿命的高频变压器绕组绝缘试验电压确定方法

An Insulation Test Method Based on the Dielectric Insulation Life for Windings in High-Frequency Transformer

频率的提升使高频变压器具有较高的传输效率,然而在高频电-热耦合效应下绕组绝缘问题显著。为保证高频变压器的长期稳定运行,提出一种基于材料绝缘寿命的高频变压器外施耐压、感应耐压试验电压确定方法。该方法基于绝缘材料在不同频率下的V-t特性,获得电老化速率最快绝缘材料对应的1min耐压值与设备预期寿命对应耐压值之比,提出高频/工频(H-P)换算系数,分别给出高频、工频试验条件下的高频变压器外施耐压试验电压建议值。此外,基于Weibull分布获得绝缘材料的击穿电压-频率(V-f)特性,对传统的倍频升压法进行改进,提出感应耐压试验电压的测定方法。

Although the increase in frequency improves the transmission efficiency of highfrequency transformers,the winding insulation problem is noticeable under high-frequency electrothermal coupling effect.In order to ensure the long-term stable operation of high-frequency transformer,a method for determining the withstand voltage based on the insulation life of insulating materials was proposed.The ratio of breakdown voltage of 1min to the breakdown voltage of expected life and high-frequency/power frequency conversion factor were obtained based on the V-t characteristics.The recommended values of the applied withstand voltages under high-frequency and power-frequency test conditions were given respectively.In addition,the V-f characteristics of insulting materials were obtained based on Weibull distribution,and the recommended value of the induced withstand test voltage was proposed in combination with increasing frequency and increasing voltage method.