Study On The Electromagnetic Shielding Effectiveness Of The Step-up Transformer With Large Capacity

In the transformer capacity is more and more today, structural overheating problem of leakage magnetic field generated by the increasingly serious,often caused by overheating problem in one area, accelerate the aging of transformer oil, the decomposition speed makes the transformer insulation,the reliability and security of the affected. Therefore, for large capacity transformer, the eddy current loss of the commercial software of theleakage magnetic field distribution and metal parts was analyzed and calculated with precision, so as to determine the internal structure and themetal structure of transformer part material, shield, to prevent local overheating. However, the leakage magnetic field simulation of current is only limited to the electromagnetic part, for the heat condition of transformer can not be considered, the application of magnetic thermal coupling technology, the electromagnetic field calculation of coupled heatloss results in different position, different boundary is given, finally get the results of temperature field. In the calculation of transformer overheating have made great progress.In this paper, the reality of the development of the power transformer of electric power industry in our country, and the electromagnetic field theory,finite element analysis method, and application of software in detail, and explains the main work to be completed.Analysis of power transformer winding is introduced in this paper the causes of leakage magnetic field, type, and its effect, and analyzes the various additional loss caused by leakage magnetic field of transformer, using thermal magnetic field coupling calculation method,the different position of transformer, according to the different material and initial oil temperature of the given thermal boundary, the resulting temperature field distribution as a result, so in the overheating of the transformer is more intuitive method for analysis.In this paper, through the software Mag Net and Therm Net of the transformer internal magnetic field distribution, temperature field distribution were analyzed, finally obtained the distribution of temperature field. The final design has great reference value.