| Title |
3-D Analysis of Temperature Distribution in Transformers |
| Keywords |
반환부하법 ; 최고점 온도 ; 냉각매질 ; 아라미드지 ; 열전대 ; 열전달계수 ; |
| Abstract |
This paper deals with the temperature characteristics according to the cooling medium and the duct size in model transformers. For the analysis and the temperature-rise tests, two 400kVA model transformers have been manufactured. One has been filled with the alpha oil as the cooling medium and constructed the duct sizes of 3 textrm{mm} and 5 textrm{mm} in the low-voltage and high-voltage windings respectively. The other has been filled the beta oil and the duct sizes were 4 textrm{mm} and 6 textrm{mm}. The temperature-rise tests have been performed by the back-to-back method and the load factor has been controlled the range of 90%∼130%. The temperature values have been measured by the thermocouple and from the sixteen points in each transformer. A commercial CFD program "FLUENT" has been used for the analysis of temperature distribution. The geometry of transformer has been modeled to 3-dimensional by using the hybrid calculation mesh including the radiator. And also, the natural convection velocity has been measured at the oil top position, and compared with the calculated results. |