TED-AJ03-260 THERMAL ANALYSIS OF A DRY-TYPE TRANSFORMER

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概要

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• In this work, we studied the thermal characteristics in a dry-type transformer under various conditions. The geometrical model consists of two arrays of rectangular heat-dissipating blocks arranged in line in a transformer tank. A two-dimensional, steady turbulent flow is simulated. Standard k-e turbulence model is adopted. The set of transport equations is solved numerically using the finite volume technique. Non-uniform grid nodes of approximately 29000 are used. Finer grids are used in boundary layer and in the areas of large gradients to capture the details. Changes in dependent variables especially temperature and energy balance are monitored for successive iterations for convergence. Solutions are presented for the temperature distribution in the conducting coils and cooling horizontal ducts of the transformer. The effects of important parameters, such as the block ratio (BR), which is the width-to height ratio of the cross section of the conducting coil, aspect ratio of the tank (AR), and heat dissipation rate are discussed. [figure] The results show that the flow has a primary clockwise circulating cell in the top region caused by buoyancy for BR=5. The bottom zone is almost stagnant and thermally stratified. As BR is reduced to 4,another cell emerges between the windings and the side wall and extends upwards into the top region, and thus the cooling effect of the top wall decreases. Further reduce BR to 3,the two cells collapse into a single one. The maximum temperature drops by 7.2 percent as BR is increased from 3 to 5. As for the aspect ratio, the maximum temperature is lowered by 17 percent as AR is decreased from 0.4 to 0.257. The maximum temperature drops by approximately 6 percent when the number of coils is increased from 17 to 23. [figure]

• 一般社団法人日本機械学会の論文

著者

• Shih Chun

  Department Of Mechanical Engineering National Central University

• Peng Shih

  Department Of Mechanical Engineering National Central University

• Tseng Chung

  Department of Mechanical Engineering, National Central University

• Tseng Chung

  Department Of Mechanical Engineering National Central University

• Shih Chun

  Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan

関連論文

• TED-AJ03-260 THERMAL ANALYSIS OF A DRY-TYPE TRANSFORMER
• Variation of Electrostatic Discharge Robustness Induced by the Surface Morphology of High Power Light-Emitting Diodes

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