Calculation of the Internal Temperature Field of Transformer by the Method of Combination the Finite Element and the Finite Volume

Abstract:

Oil immersed transformer is an important equipment ofpower system, whose fault is often caused by the aging of insulation. In actualoperation, accurate calculation of the temperature field, especially hot spottemperature of transformer winding, is very important for stabilizing the powergrid operation and extending the transformer life. In order to calculate thetransformer's hot spot temperature accurately, a new method which is based oncomparison of respective advantages of the FEM and FVM is used; we take a31.5MVA transformer as exemple, using the hybrid method of the FEM and the FVM,the three-dimensional temperature field of transformer is calculated. Bycomparing the figures of top oil temperature of transformer monitored by theoperating transformer and the figures calculated by mixed method, the marginerror of the hot spot temperature is only 1.9°C. While the IEEE guidelines formodel calculation results, the calculated results of FEM algorithm and FVMalgorithm results with the monitoring data of standard deviation were as highas 4.6 °C, 3.8 °C and 3.1 °C. The Calculation accuracy is much higher than theaccuracy of the result using IEEE regulatory model, FEM and FVM, proved thatthis mixed method can calculate the internal temperature field of oil immersedtransformer accurately.

• Periodical: Advanced Materials Research (Volumes 1079-1080)
• Pages: 492-497
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1079-1080.492
• Online since: December 2014
• Authors: Lun Ma*, Liu Wang, Ying Ying Sun, Tao Wan, Jia Peng Wei, Jian Fei Dang, Qi Qin
• Keywords: Finite Element Method (FEM), Finite Volume Method (FVM), Oil Immersed Transformer, Temperature Field

References

[1] D. J. Tylavsky, H. Qing, S. Jennie, G. A. McCulla, J. R. Hunt. Transformer top-oil temperature modeling and simulation[J]. IEEE Transactions on Industry Applications, 2000, 36(5): 1219-1225.

DOI: 10.1109/28.871267

[2] pan. Power transformer insulation fault diagnosis method and dynamic thermal model research [D]. Chongqing: chongqing university, (2009).

[3] Chen Weigen Su Xiaoping, Chen, zhou canal, Qian Guochao. Heat transformer top oil temperature prediction model of influence factors analysis and improvement [J]. High voltage technology, 2010, 37 (6) : 10331-10337.

[4] Fu Chenzhao,. Cable transformer winding temperature rise mathematical estimation [J]. High voltage technology, 10-12, 2002, 28 (7).

[5] Skillen, A. Revell, H. Iacovides, W. Wu. Numerical prediction of local hot-spot phenomena in transformer windings[J]. Applied Thermal Engineering, 2012, 36(1): 96-105.

DOI: 10.1016/j.applthermaleng.2011.11.054

[6] N. El Wakil, N. C. Chereches, J. Padet. Numerical study of heat transfer and fluid flow in a power transformer[J]. International Journal of Thermal Sciences, 2006, 45(6): 615-626.

DOI: 10.1016/j.ijthermalsci.2005.09.002

[7] E. Hajidaalloo, M. Mohamadianfard. Effect of sun radiation on the thermal behavior of distribution transformer[J]. Applied Thermal Engineering, 2010, 30(10): 1133一1139.

DOI: 10.1016/j.applthermaleng.2010.01.028

[8] TAO Wencuo. The numerical heat transfer [M]. Xi an: xi , an jiaotong university press, (2001).

[9] Fu Chenzhao, deserves to win chang. The two-dimensional numerical calculation of temperature field of transformer winding [J]. High voltage technology, 2002, 28 (5) : 10-12.

[10] Li Ji, Luo Longfu, Xu Guzhu. Electric locomotive main transformer tank of the three-dimensional temperature field finite element analysis [J]. High voltage technology, 2005, 31 (8), 21-23.

[11] J. Gastelurrutia, J. C. Ramos, G. S. Larraona, A. Rival, J. Izagirre, L. Del Rio. Numerical modelling of natural convection of oil inside distribution transformers[J]. Applied Thermal Engineering, 2011, 31(4): 493-505.

DOI: 10.1016/j.applthermaleng.2010.10.004

[12] J. H. Ferziger. Computational methods for fluid dynamics[M]. New York: Springer, (2002).

[13] J. H. Lienhard. A heat transfer textbook[M]. Cambridge: Phlogiston Press, (2005).

[14] Wang Xiaoyuan, li baolin, Liu Lixia. Transformer three dimensional temperature field analysis and calculation [J]. Journal of tianjin university. 1996, 29 (3) : 320-323.

[15] GB/T 15164-1994 oil-immersed power transformer load (1994).