Influence of Different Turret-Tank Connection Types on Transformer Turret Eddy Currents

  • Tomislav ŽupanEmail author
  • Bruno Jurišić
  • Franjo Kelemen
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 598)


All metal parts of the transformer tank are usually electrically connected and grounded in order to prevent the possibly hazardous floating potential from emerging. The magnetic field of transformer leads and bushings’ conductors induces eddy currents on nearby metal parts such as tank top and bushing turrets. Since the above-mentioned electrical connections can form the unwanted conducting path loops, the type of these connections can help in restricting the eddy currents and consequently the losses in metal parts and the heat generated in them. This is especially true for high-current power transformers such as generator step-up units. This research presents calculated and measured results of the influence of different bushing turret-tank connection types on the induced eddy current values. The simulation results were obtained using the finite element method based software. Comparison against the measurements shows that these eddy currents can be adequately modelled and predicted using calculations which can prove useful in the design phase of the transformer manufacturing process. By carefully choosing the connection type and the location of the shorting element, the eddy current conducting path loops can be restricted and therefore the values of these currents can be limited as well. This can, in turn, lead to lower local losses and reduced heating of the metal parts, all of which can be easily shown using Rogowski coils for current measurements and thermal imaging systems for thermography measurements, respectively.


Bushing Eddy currents Losses Power transformer Turret 


  1. 1.
    Milagre, A.M., Da Luz, M.V.F., Cangane, G.M., Komar, A., Avelino, P.A.: 3D calculation and modeling of eddy current losses in a large power transformer. In: Proceedings - 2012 20th International Conference on Electrical Machines, ICEM 2012, vol. i, pp. 2282–2286 (2012)Google Scholar
  2. 2.
    Zhang, Y., Yan, B., Cao, F., Xie, D., Zeng, L.: Analysis of eddy current loss and local overheating in oil tank of a large transformer using 3-D FEM. In: 2011 International Conference on Electrical Machines and Systems, ICEMS 2011, pp. 3–6 (2011)Google Scholar
  3. 3.
    Magdaleno-Adame, S., Olivares-Galvan, J.C., Escarela, R., Raichenko, O., Kladas, A.G.: Hot spots mitigation on tank wall of a power transformer using electromagnetic shields. In: Proceedings - 2014 International Conference on Electrical Machines, ICEM 2014, pp. 2235–2238 (2014)Google Scholar
  4. 4.
    Olivares-Galvan, J.C., Magdaleno-Adame, S., Escarela-Perez, R., Ocon-Valdez, R., Georgilakis, P.S., Loizos, G.: Experimental validation of a new methodology to reduce hot spots on the screws of power transformer tanks. In: Proceedings - 2012 20th International Conference on Electrical Machines, ICEM 2012, pp. 2318–2322 (2012)Google Scholar
  5. 5.
    Yang, J.: New preventive measures against stray field of heavy current carrying conductors. IEEE Trans. Magn. 9(Suppl. A), 271–1492 (1996)Google Scholar
  6. 6.
    Renyuan, T., Li, V., Lin, F., Lijian, T.: Resultant magnetic fields due to both windings and heavy current leads in large power transformers. IEEE Trans. Magn. 32(3 PART 2), 1641–1644 (1996)CrossRefGoogle Scholar
  7. 7.
    Takahashi, N., Kitamura, T., Horii, M., Takehara, J.: Optimal design of tank shield model of transformer. IEEE Trans. Magn. 36(4 I), 1089–1093 (2000)Google Scholar
  8. 8.
    Li, Y., Ho, S.L., Wang, N., Tang, R.Y.: Numerical analysis of eddy current field in the ascending flange for the bushings and tank wall of a large transformer. In: 2008 Joint International Conference on Power System Technology. POWERCON IEEE Power India Conference, POWERCON 2008, vol. 44, no. 6, pp. 1522–1525 (2008)Google Scholar
  9. 9.
    Yan, X., Yu, X., Shen, M., Xie, D., Bai, B.: Research on calculating eddy-current losses in power transformer tank walls using finite-element method combined with analytical method. IEEE Trans. Magn. 52(3), 1–4 (2016)Google Scholar
  10. 10.
    Maximov, S., Olivares-Galvan, J.C., Magdaleno-Adame, S., Escarela-Perez, R., Campero-Littlewood, E.: New analytical formulas for electromagnetic field and eddy current losses in bushing regions of transformers. IEEE Trans. Magn. 51(4), 1–10 (2015)CrossRefGoogle Scholar
  11. 11.
    Maximov, S., Escarela-Perez, R., Magdaleno-Adame, S., Olivares-Galvan, J.C., Campero-Littlewood, E.: Calculation of nonlinear electromagnetic fields in the steel wall vicinity of transformer bushings. IEEE Trans. Magn. 51(6), 1–10 (2015)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Tomislav Župan
    • 1
    Email author
  • Bruno Jurišić
    • 1
  • Franjo Kelemen
    • 2
  1. 1.Končar – Electrical Engineering Institute Inc.ZagrebCroatia
  2. 2.Končar – Power Transformers Ltd.ZagrebCroatia

Personalised recommendations