The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

3-D Analysis of Temperature Distribution in Transformers

변압기의 3차원 온도분포 해석

  • 오연호 (한국전기연구소 신전력기기그룹) ;
  • 송기동 (한국전기연구소 신전력기기그룹) ;
  • 선종호 (한국전기연구소 전력설비진단그룹)
  • Published : 2003.09.01
Download PDF
⟨ Previous Next ⟩

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.

Keywords

References

  1. A. White, M. R. Daniels, 'Thermal Assessment of Transformers', Cigre 1990 session, pp. 12-105, 1990. 9
  2. W. Lampe, Pettersson, 'Hot-Spot Measurements in .. Power Transformers', Cigre 1984 session, pp. 12-02, 1984.8
  3. K. Karsai D et al., Large Power Transformers, Oxford N.Y., pp. 351-359, 1987
  4. 仲坤 芳武 외 2인, かマ變壓器冷却への 流れ解析技術の適用,' 富士時報, Vol.69, pp. 481-485, 1996. 9
  5. M, Necati Ozisik, Heat Transfer, McGraw-Hill, Inc., pp, 422-436, 1985
  6. J. N. Reddy, D. K. Gartling, The Finite Element Method in Heat Transfer and Fluid Dynamics, CRC Press, pp. 188-202, 1994
  7. 김순태 외 16인, 지상변압기 품질개선 및 적용기술 연구, 한국전력공사, pp. 310-356, 1994
  8. 木村久男, 新版變壓器 の 設計工作法, pp. 93-94, 1980
  9. Klaus A. Hoffmann, Steve T. Chiang, Computational Fluid Dynamics for Engineers, A Publication of Engineering Education System, pp. 308-334, 1993
  10. 岩琦秀夫 외 2인, 熱流體ツミュレ-ツョソ技術, 富士時報, Vol. 52, pp. 34-37, 1997