基于三维涡流场模型的变压器结构件损耗计算  

Calculation of Transformer Structure Loss Based on 3D Eddy Current Field Model

作　　者：周壮广 可欣荣[1] 张建瓴[1] ZHOU Zhuang-guang;KE Xin-rong;ZHANG Jian-ling(College of Engineering South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]华南农业大学工程学院,广州510642

出　　处：《电力学报》2020年第2期166-173,共8页Journal of Electric Power

基　　金：2017年度教育部“蓝火计划”(惠州)产学研联合创新项目资助(CXZJHZ201731)。

摘　　要：提出了一种基于三维涡流场模型的变压器结构件损耗精确计算方法,并以S9-1600/10/0.4型配电变压器为例和传统的损耗计算方法进行了对比。首先利用有限元软件(如Comsol等)计算变压器内部电磁场,获得变压器的外特性曲线,经数据拟合后得到变压器外特性曲线的一般表达式,由此计算变压器在不同功率因数和负载率下的负载电流,再将此负载电流作为三维涡流场模型中线圈的电流激励来计算变压器各结构件的损耗。该方法考虑了变压器实际负载电压随负载电流变化的因素,计算结果的精度更高,且能方便计算任意功率因数和负载率下的损耗值。仿真算例的计算结果表明,在功率因数较低和负载率较大时,该方法计算得到的结构件损耗值和未修正的传统计算方法得到的损耗值之间存在较大差异;在功率因数较大和负载率较小时,其差异不明显。因此,在精确计算变压器温度场和热点时应考虑这种差异。A new method for calculating the losses of transformer structural parts based on 3 Deddy current field model was put forward.The calculation results of loss in structural components of S9-1 600/10/0.4 distribution transformer which be taken as an example by using the new method were compared with the results by using traditional method.The electromagnetic field inside the transformer were simulated using finite element software(Comsol,etc).The external characteristics curves of transformer were given,and the general expression of external characteristics of transformer were obtained by using data fitting method.Therefore,the load current of the transformer under different power factors and load rates could calculate,and the calculated load current was used for the current excitation of the coil in the 3 Deddy current field model to calculate the losses in the conductive parts of transformer.This method takes into account the factors that the actual load voltage of transformer varies with the load current,and the calculation results of loss in structural components are more accurate.Moreover,it is also convenient to calculate the losses of structural parts under arbitrary power factor and load rate.The calculation results of simulation example showed that there is a big difference between the loss value of the structural parts calculated in this paper and that of the traditional calculation method when the power factor is low and the load rate is large.The difference is not obvious when the power factor is large and the load rate is small.Therefore,this difference should be taken into account when accurately calculating the temperature field and hot spot of transformer.

关 键 词：配电变压器 三维涡流场模型 结构件损耗 负载电流 有限元法 

分 类 号：TM41[电气工程—电器]