Analysis On3D Electric Field At The End Insulation And Thermal Field Of Transformer

As one of the important equipment in power generation, transmission, distribution and substation system, transformer plays a very significant role in the stabilized transmission, rational distribution, economic operation and safe use of electric energy. The safety of transformer has much to do with the design rationality of its insulation structure. With the development of modern power network, transformer is developing towards the trend of large capacity and extra-high voltage, then the transformer insulation and thermal issues is becoming more and more prominent.Before the insulation structure of reasonable design, the distribution, the maximum intensity and its position of electric field in the insulation structure are need to be known before insulation structure designing. so the electric field analysis of the key area of the the transformer is very necessary.A three-coil transformer (SFSZ11-63000/220) is analyzed in this paper. firstly, the parameterized model for end insulating structure of the transformer is built by VB programming language and Pro/E that used for3D mechanical design; secondly, and then the electric field is analyzed by Ansoft.Firstly, the electric field of winding end of power transformer is analyzed by Ansoft. Choose different areas in winding end transformer, and the voltage and electric field distribution cloud image are obtained through calculation and analysis software, then the zone where the electric field intensity is largest is determined through the analysis of the cloud image, and this provides reference for the more reasonable design for transformer end insulation structure.Finally, according to the related theory of temperature field and flow field, the model of solving the transformer temperature field is established by the FLUENT software, the whole temperature field distribution is obtained, and compares the influence of different oriented area number, load factor and center heights of radiator on the transformer temperature field and flow field, then provides certain reference basis on reducing the winding hot spot temperature rise.