Analysis for Temperature Rise of a Three-Phase Four Limbs Transformer by Soil Structure with DC Bias

Abstract:

In this paper, a method for earth potential computation of layered soil structure is discussed. To calculate thermal field of the transformer with dc bias, simulation models using MAXWELL and COMSOL are proposed. Based on the electromagnetic analysis, electric power loss resulted in temperature rise is calculated. Under the case of normal operation of transformer, a research was carried out to compare the abnormal changes of temperature of transformer. It worked out that if there are different DC parts in transformer, the loss will increase with DC bias and the temperature of transformer core will also increase. If it is increasing continuously and no preventive measures are taken soon, the thermal aging of some parts in transformer will speed up and gradually affect the normal operation of transformer. The research lays the groundwork for further research of transformer DC bias and aging.

• Periodical: Applied Mechanics and Materials (Volumes 764-765)
• Pages: 481-485
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.764-765.481
• Online since: May 2015
• Authors: Yong Ming Yang, Xing Mou Liu*, Xu Duan
• Keywords: DC Bias, Soil Structure, Transformer Temperature

References

[1] Li Hongzhi, CuiXiang, LuTiebing, et al.: Electric Circuit and Magnetic Circuit Combined Model of DC Biased Power Transformer[J]. Proceedings of the CSEE. 2009, 29 (27) : 119-125.

[2] Wang Xuefend, YuXiaofei, Zhou Junyu: Study on the DC current of Neutral Point of Transformer in AC and DC Mixed Power System[J]. Power System Technol-ogy. 2008, 32(12): 96-98.

[3] Li Huiqi, CuiXiang, HouYongliang, LiLin, Lu Tiebing: Experimental studies and Calculations of the exciting current in the transformer under DC bias magnetization[J]. Journal of North China Electric Power University. 2007, 34(4): 1-6.

[4] Li Xiaoping, Wen Xishan: DC Bias Computation Study on Three-phase Five Limbs Transformer[J]. Proceedings of the CSEE. 2010, 30(1): 127-131.

[5] Ma Weimin: DC Biasing Current in Converter Transformer[J]. High Voltage Engineering. 2004, 30 (11) : 48-49.

[6] Zhu Yiying, JiangWeiping, ZengZhaohua, et al.: Studying on Measures of Restraining DC Current Through transformer Neutrals[J]. Proceedings of the CSEE. 2005, 25(13): 1-7.

[7] Zhang Bo, Zhao Jie, Zeng Rong, et al.: Estimation of DC Current Distribution in AC Power System Caused by HVDC Transmission System in Ground Return Status[J]. Proceedings of the CSEE. 2006, 26(13): 84-88.

DOI: 10.1109/tpwrd.2007.908748

[8] Huang Fucheng, Ruan Jiangjun, Zhang Yu, Wang Yan: DC Magnetic Bias Induced Current Effects on Transformer and Restricting Methods[J]. High Voltage Engineering. 2006, 32(9): 117-120.

[9] C. A. Baguley, U. K. Madawala, and B. Carsten: The Impact of Vibration Due to Magnetostriction on the Core Losses of Ferrite Toroidals Under DC Bias, IEEE TRANSACTIONS ON MAGNETICS, 8(2011): 2022-(2028).

DOI: 10.1109/tmag.2011.2129523

[10] C. A. Baguley, U. K. Madawala, and B. Carsten: A New Technique for Measuring Ferrite Core Loss Under DC Bias Conditions, IEEE TRANSACTIONS ON MAGNETICS, 11(2008): 4127-4130.

DOI: 10.1109/tmag.2008.2002862

[11] Y.Y. Yao, D. X. Xie, B. D. Bai, and L. S. Zeng: The no-load performance of 3-phase transformer bank under direct current bias based on the 3D transient analysis, in Proc. 2001 fifth International Conference on Electrical Machines and Systems, vol. 1, pp.281-284.

DOI: 10.1109/icems.2001.970667

[12] P. Pao-la-or, A. Isaramongkolrak and T. Kulworawanichpong: Finite element analysis of magnetic field distribution for 500-kV power transmission systems, Engineering Letters, vol. 18, no. 1, pp.1-9, Feb. (2010).

[13] P. Meesuk, T. Kulworawanichpong, and P. Pao-la-or: Magnetic field analysis for a distribution transformer with unbalanced load conditions by using 3-D finite element method, in Proc. 2011World Academy of Science, Engineering and Technology, pp.339-344.