Research On Temperature Field Of Converter Transformer Based On Uneven Heat Source

Converter transformer winding current contains a large number of higher harmonic components in the actual operation,which produce harmonic leakage magnetic field and higher harmonic losses on the winding,iron core and metal structure.Because of uneven distribution of the losses,the concentration of loss in a local area can cause the local overheating on the winding,iron core and metal structure,making temperature rise among various regions of the converter transformer clearly different,namely,appearing a phenomenon,uneven distribution of temperature in the converter transformer internal regions.However,the traditional average temperature rise will not be able to reflect the real temperature distribution of converter transformer,accurately and comprehensively.Therefore,by grasping the heat source density accurately and making the uneven distribution of loss as heat source of temperature field,the accurate distribution of temperature field and the local hot spot of converter transformer can be obtained,which provides the basis for converter transformer insulation design and life estimation.Sponsored by the National Natural Science Foundation of China under grant51407075 and supported by the Fundamental Research Funds for the Central Universities 2015MS79,firstly,this paper analyzed harmonic magnetic field and the loss distribution of iron core and winding by the finite element method.Secondly,this paper researched heterogeneous grid nodes data mapping algorithm,and a high accuracy and high efficiency hybrid algorithm will be put forward,which passed uneven loss to corresponding grid unit of fluid-temperature field accurately.Finally,this paper analyzed fluid field and temperature field by the finite element method,and temperature field distribution were compared in the case of loading the average heat source and in the case of loading the non average heat source.