Analysis And Research On Heat Dissipation Efficiency Of Large Transformer Plate Radiator

With our country attaching great importance to the problem of resource saving,large transformers are gradually developing towards the trend of energy saving and environmental protection.In order to ensure the safe supply of electric energy,the temperature of transformers must be effectively controlled.Panel type radiator is widely used in large oil-immersed transformers at present.Due to the defects in internal structure design and structural arrangement,the heat dissipation efficiency of the panel type radiator is not high.Therefore,continuously improving the heat dissipation effect of the panel type radiator and developing the panel type radiator with high heat dissipation efficiency have a positive influence on extending the operating life and improving the safety performance of the transformers.In order to solve the problem of low heat dissipation efficiency of ordinary panel type radiators,the methods of changing the length of oil channels and stamping the tetrahedral patterns on the surface of the panel type radiator were adopted.Studied on heat transfer performance of oil and air sides of new type radiator,and deeply analyzed the influence of the structural parameters and arrangements of the tetrahedral patterns on heat dissipation efficiency of new panel type radiator.The specific research works mainly included:Firstly,the heat dissipation performance of the oil side of conventional pannel type radiator was numerically simulated.Aiming at the disadvantage of non-uniform distribution of oil flow in each ordinary oil channel,the length of oil channels were improved to obtain the length of oil channels with the highest heat dissipation efficiency.Secondly,the method of surface stamping tetrahedral patterns was used to enhance the heat dissipation capability of the panel type radiator.Based on the secondary flow theory and the field synergy principle,the influence of the structural parameters of the tetrahedral patterns on the oil side heat dissipation performance of new panel type radiator was analyzed.The finite element models of control groups of pattern widths,lengths and attack angles were established.Fluent software was used to simulate the thermal flow field of the control models with different structural parameters.By analyzing the temperature distribution and the flow characteristics of transformer oil,the optimal tetrahedral pattern width,length and attack angle were obtained.Analysis of flow and heat dissipation characteristics of tetrahedral patterns with different arrangements,the finite element models of tetrahedral pattern arrangements,longitudinal distances and row numbers control group were established,and the optimal arrangements were obtained by numerical simulation.By comparing the simulation results with the basic control group,it was found that the optimization of the arrangements improved the radiation efficiency of panel type radiator in varying degrees,which verifies that the stamping new tetrahedral patterns were beneficial to improve the heat dissipation performance of panel type radiators.Thirdly,based on the theoretical basis of the research on the oil side heat dissipation characteristics of the new panel type radiator,two finite element calculation models of tetrahedron patterns were established.Simulated velocity distribution of air flowing through tetrahedron pattern,the process of generating the vortex was analyzed,and the intensity of the vortices produced by two patterns were compared,which provided an intuitive basis for the study of the air side heat dissipation performance of new panel type radiator for tetrahedral patterns.Finally,the new single-channel air side heat dissipation performance of two different pattern arrangements were discussed.The mechanism of the tetrahedral pattern to enhance the heat dissipation capacity of the single oil passage was analyzed,the heat dissipation efficiency of the two new oil channels and the ordinary oil channels were compared.It was found that stamping tetrahedral pattern on the surface of new single oil channel was an efficient and energy-saving method to enhance the heat dissipation effect of panel type radiator.