谐波下干式变压器铁心磁场-温度场仿真分析

Simulation Analysis of Magnetic Field-Temperature Field About Dry-type Transformer Core Under Harmonics

为了更加准确地研究干式变压器铁心磁场和温度场分布,分析不同激励对干式变压器铁心磁场损耗和热点温升的影响,首先使用Maxwell计算了干式变压器瞬态磁场分布,得到空载条件下铁心磁场损耗。在此基础上提出了一种三维干式变压器磁场-温度场耦合计算方法,将磁场损耗耦合至Fluent作为温度场计算的热源,采用流固耦合的方法计算干式变压器温度场分布,获得铁心热点温度和位置。最后,基于上述方法对谐波下变压器铁心的磁场和温度场进行计算,分析了谐波次数和谐波含有率对干式变压器铁心损耗和温升的影响。所研究内容为谐波下变压器铁心温升监测提供了参考。

In order to study the distribution of magnetic field and temperature field of dry-type transformer iron core more accurately,analyze the influence of different excitation on the magnetic field loss and hot spot temperature rise of dry-type transformer core,firstly,Maxwell was used to calculate the transient magnetic field distribution of dry-type transformer,and the loss of the iron core under no-load condition was obtained.On this basis,a three-dimensional dry-type transformer magnetic field-temperature field coupling calculation method was proposed.The magnetic field loss was coupled to Fluent as the heat source of temperature field calculation,and the fluid structure coupling method was used to calculate the temperature field distribution of dry-type transformer.Finally,based on the above method,the magnetic field and temperature field of transformer core under harmonic action were calculated,and the influence of harmonic on core loss and temperature rise of dry-type transformer was analyzed,which provides a reference for the monitoring of the temperature rise about the transformer core under harmonics.