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Analyzing Short Circuit Forces in Transformer for Double Layer Helical LV Winding using FEM

Volume 14, Number 3, March 2018, pp. 425-433
DOI: 10.23940/ijpe.18.03.p3.425433

Deepika Bhallaa, Raj Kumar Bansalb, and Hari Om Guptac

aIK Gujral Punjab Technical University, Kapurthala, Punjab,144 603, India
bGuru Kashi University, Talwandi sabo, Punjab, 151 302, India
cJ. P. Institute of Information Technology, Sector 128, 201 314, India

(Submitted on May 9, 2017; First revised on July 30, 2017; Second revised on January 11, 2018; Accepted on January 14, 2018)


Abstract:

In medium and high capacity transformers where current rating is high and the number of turns is low, the low voltage (LV) winding is generally of the helical type. These helical windings have very large magnitudes of electromagnetic forces during a short circuit. This is due to the inherent asymmetry of helical structure. The objective of this work is to use the finite element method to compute the radial and axial components of short circuit forces and identify areas of high stresses in the windings. This can be used to find the likely reason of transformer failure during a short circuit. For this work, a 3-phase power distribution transformer of 11kV/433V, 630kVA rating is considered. The effect on short circuit forces of the tapping in the center of HV winding is also studied.

 

References: 14

  1. H. -M. Ahn, J. -Y. Lee, J. -K. Kim, S. -Y. Jung, and S. -C. Hahn, “Finite-Element Analysis of Short-Circuit Electromagnetic Force in Power Transformer,” IEEE Transactions on Industry Applications, vol. 47, no. 3, pp. 1267 – 1272, 2011
  2. A. Bakshi, and S. V. Kulkarni, “Towards Short-Circuit Proof Design of Power Transformers” International Journal for Computation and Mathematics in Electrical and Electronics Engineering, vol. 31, no. 2, pp. 692-702, 2012
  3. N. K. Beniwal, D. K. Dwivedi, H. O. Gupta, “Creep life assessment of distribution transformer,” Engineering failure Analysis, pp. 1077-1085, 2010 (DOI: 10.1016/j.engfailanal.2010.01.001)].
  4. D. Bhalla, R. K. Bansal, and H. O. Gupta, “Analysing Short Circuit Forces in Transformer with Single Layer Helical LV Winding using FEM,” Proceedings of 2nd International Conference on Recent Advances in Engineering & Computational Sciences (RAECS), (DOI:10.1109/RAECS.2015.7453274)
  5. Y. Chao, X. Wang, and X. Dexin, “Positive and Contrary-Direction Transposition of Double Helical Winding in Power Distribution Transformer,” Proceedings of 5th International Conference on Electrical Machines and Systems, pp. 198-200, 2001.
  6. M. David, “Finite Element Method Magnetics,” Version 4.2, User’s Manual, 2010
  7. J. H. Harlow, Electrical Power & Transformer Engineering, CRC Press.
  8. IEC standard 60076 Power Transformers
  9. S. V. Kulkarni and S. A. Khaparde, “Transformer Engineering: Design and Practice,” New York: Marcel Dekker, May 2004.
  10. G. B. Kumbhar, and S. V. Kulkarni, “Analysis of Short-Circuit Performance of Split-Winding Transformer using Coupled Field-Circuit Approach,” IEEE Transactions on Power Delivery, vol. 22, no, 2, pp. 936-942, 2007
  11. M. A. Sanz-Bobi, L. Rouco, R. Palacios, L. Flores, and P. Cirujano, “A Tool for the Assessment of Electromagnetic forces in Power Distribution Transformers,” Journal of Energy and Power Engineering, vol. 5, no 10, pp. 972-977, 2011.
  12. R. Smeets, “Short-circuit withstand capability of power transformers-Part I”, Transformers Magazine, vol. 4, no.2, http://www.transformers-magazine.com, April 2017
  13. X. Wang, S. Yu, Q. Zhao, S. Wang, R. Tang, and X. Yuan, “Effect of Helical Angle of Winding in Large Power Transformer,” in Proceedings of International Conference on Electrical Machines and Systems, pp. 355-357, 2003
  14. H. Zhang, B. Yang, W. Xu, S. Wang, G. Wang, and J. Zhang, “Dynamic Deformation Analysis of Power Transformer Windings in Short-Circuit Fault by FEM,” IEEE Transactions on Applied Superconductivity, vol. 24, no. 3, June 2014 (DOI: 10.1109/TASC.2013.2285335)

 

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