电力变压器铁芯温度场的数值模拟研究

变压器铁芯温度场是比较典型的流体-构件耦合场.本文系统论述了这种耦合场的数值模拟方法,对铁芯工作磁密、油道尺寸、油流速度、进油温度等影响铁芯温升的因素进行了分析计算.试验结果表明,适当提高工作磁密、合理设计油道尺寸、综合考虑油道设置、尽量采用较高油流速度和较低进油油温对提高变压器运行效益、降低铁芯温升是有实际意义的.

The Temperature Field in a Power Transformer Core by Numerical Smiulation

The temperature field in a power transformer core is a typical fluid-structure interaction coupled field. The FEM is used to study the numerical simulation of the field. The actual core loss distribution, which is the heat source, is obtained by computing the time-varying magnetic field with anisotropic and nonlinear media. The effects of factors such as the flux density, fluid property, flow velocity, shape and dimension of the oil channel, and oil temperature on the temperature rise have been taken into consideration. A novel iterative formulation for determining the local heat dissipation coefficient and mixing-cup temperature with given inlet and outlet oil temperature and given temperature distribution on the heating surface is developed. Several practical cases are investigated and the main computational results are compared with the experimental ones.