树脂绝缘干式变压器内部温度场的计算

Temperature field calculation of cast-resin dry-type power transformers

树脂绝缘干式变压器内部局部温度过高会导致绝缘老化加速,大大降低变压器的使用寿命。以SC9系列一台低压箔绕单风道高压线绕无风道的树脂绝缘干式变压器为研究对象,建立了简化二维轴对称物理模型。利用该模型,通过ANSYS有限元软件仿真得到了干式变压器内部的稳态温度场。同时,还利用热路解析法,建立了干式变压器的等效热路模型。通过测量变压器表面周围空气的温度,分别对干式变压器内部的稳态温度场和暂态温度场进行了求解,并开发出基于Visual Basic的计算程序。

The local temperature of Cast-resin dry-type power transformer overheated can largely reduce the service life of dry-type power transformer.In this thesis,a SC9cast-resin dry-type power transformer whose foil-type LV winding has one air duct and layer-type HV winding has no duct is investigated.A simplified 2Daxisymmetric physical model of dry-type power transformer is established.A finite element analyzing software ANSYS is used to simulate the steadystate temperature field of the cast-resin dry-type power transformer.This thesis also establishes and analyzes the drytype transformers＇ equivalent thermal circuit model by using the analytic method of thermal circuit.The transient temperature field and the steady-state temperature field of the dry-type power transformer are respectively solved by using the method of thermal circuit based on measured surrounding air temperature,furthermore,a computer program based on Visual Basic is developed.