Advanced SearchSearch Tips
Characteristic Analysis of Hot Spot Temperature according to Cooling Performance Variation of Natural Ester Transformer
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Characteristic Analysis of Hot Spot Temperature according to Cooling Performance Variation of Natural Ester Transformer
Kim, Ji-Ho; Lee, Hyang-Beom;
  PDF(new window)
Natural ester has a higher biodegradability, flash and fire points, and a greater permittivity compared to conventional mineral oils. However, natural ester also has a higher pour point, viscosity, and water content. These characteristics hamper circulation and the electrical properties of oil-filled transformer. Thus, this paper applied electromagnetic-thermal-flow coupled analysis method to predict temperature distribution inside 154kV single phase power transformer using natural ester. It modeled in the actual appearance for the tank and winding of the power transformer to improve the accuracy of analysis and applied heat flow analysis that considered hydromechanics and heat transfer at the same time. It calculated the power loss, the main cause of temperature rise, from winding and core with electromagnetic analysis then used for the heat source for the heat flow analysis. It then compared the reasonability of result of measurement analysis based on the result acquired from temperature rise test using FBG sensor on the power transformer.
CFD analysis;Cooling performance;Natural ester;Power transformer;Temperature rise test;
 Cited by
Kweon, D. J., Koo, K. S.. "The Characteristics of fire prevention for Less Flammable Fluid of Transformers". Proceedings of the KIIEE conference. Vol. 2010 No. 9, pp. 201-202 (2010)

K. Preis, O. Biro, G. Buchgraber, and I. Ticar, "Thermal Electro- magnetic Coupling in the Finite-Element Simulation of Power Transformers", IEEE Trans. Magnetics, vol. 42, no.4, pp. 999-1002, (2006) crossref(new window)

Ahn, H. M., Oh, Y. H., Hahn, S. J., "Heat Transfer Analysis of Coupled Electromagnetic-Thermal Field for Power Transformer". Trans. of the KIEE, Vol.58 No.11, pp.2155-2161. (2009)

Kim, J. H., Kim, Y. M., Ro, K. C.. "Analysis of transformer sheet winding losses and temperature rise" Proceedings of the KIEE conference. Vol. 2005, No.10, pp. 23-25. (2005)

J. Smolka, A. J. Nowak, Luiz C. Wrobel, "Numerical modeling of thermal precesses in an electrical transformer dipped into polymerized resin by using commercial CFD package Fluent,". Computers & Fluids, Vol. 33, pp.859-868 (2004) crossref(new window)

IEEE Guide for Acceptance and Maintenance of Natural Ester Fluids in Transformers, IEEE Std C57.147 (2008)

Z. Wang et. al., "New Insulation Fluids : Use of Environmentally Friendly Fluids in Power Transformers", CIGRE, 2007