Skip to main content
SpringerLink
Log in

Numerical calculation for circulating current in stator transposition bars of large water-cooled turbo-generators

  • Article
  • Published:
Science China Technological Sciences Aims and scope Submit manuscript

Abstract

Accurate calculation of circulating current is one of the key problems for stator transposition bars in the design of turbo-generators. Aimed at limitation that analytical algorithm of circulating current could not reflect the local electromagnetic field distribution and difficulty that overlaps easily exist in solid modeling process of stator transposition bars, a simplified physical model of transposition bars is established. A three-dimensional (3-D) numerical method for circulating current in stator transposition bars of large water-cooled turbo-generators is investigated, which is combined with field-circuit coupling method. Taking stator bars less than 540° transposition with void model of a 600-MW water-cooled turbo-generator as the research object, the magnetic flux density distribution, current density distribution and circulating current distribution of transposition strands are obtained by numerical calculation. Compared with calculation results of the improved analytical algorithm, the correctness of the numerical calculation for circulating current is demonstrated, the calculation value difference for the maximum current of strands is obtained. The numerical calculation for circulating current will provide an appropriate basis for the reasonable calculation of local overheating of stator transposition bars and the design of safety margin for turbo-generators.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Wojda R P, Kazimierczuk M K. Analytical optimization of solidround-wire windings. IEEE Trans Ind Electr, 2013, 60: 1033–1041

    Article  Google Scholar 

  2. Romary R, Demian C, Schlupp P, et al. Offline and online methods for stator core fault detection in large generators. IEEE Trans Ind Electr, 2013, 60: 4084–4092

    Article  Google Scholar 

  3. Wrobel R, Mlot A, Mellor P H. Contribution of end-winding proximity losses to temperature variation in electromagnetic devices. IEEE Trans Ind Electr, 2012, 59: 848–857

    Article  Google Scholar 

  4. Taniyama Y, Ueda T, Fujita M, et al. Technologies for high efficiency large capacity turbine generator. In: International Conference on Electrical Machines and Systems. Tokyo, JPN, 2009. 1–6

    Google Scholar 

  5. Fujita M, Kabata Y, Tokumasu T, et al. Air-cooled large turbine generator with multiple-pitched ventilation ducts. In: IEEE International Conference on Electric Machines and Drives. San Antonio, USA, 2005. 910–917

    Google Scholar 

  6. Nagakura K, Otaka T, Kakiuchi M, et al. Development of the world’s largest hydrogen indirectly cooled turbine generator. In: International Conference on Electrical Machines and Systems. Tokyo, JPN, 2009. 1–6

    Google Scholar 

  7. Reddy P B, Jahns T M, Bohn T P. Transposition effects on bundle proximity losses in high-speed PM machines. In: IEEE Energy Conversion Congress and Exposition. San Jose, USA, 2009. 1919–1926

    Chapter  Google Scholar 

  8. Hattori K, Ide K, Takahashi K, et al. Performance assessment study of a 250MVA air-cooled turbo generator. In: International Electric Machines and Drives Conference. Madison, USA, 2003. 124–128

    Google Scholar 

  9. Traxler-Samek G, Zickermann R, Schwery A. Cooling airflow, losses, and temperatures in large air-cooled synchronous machines. IEEE Trans Ind Electr, 2013, 57: 172–180

    Article  Google Scholar 

  10. Xiao H Q, Xu Z, Xue Y L, et al. Theoretical analysis of the harmonic characteristics of modular multilevel converters. Sci China Tech Sci, 2013, 56: 2762–2770

    Article  Google Scholar 

  11. Zou J B, Zhao B, Xu Y X, et al. A new end windings transposition to reduce windings eddy losses for 2 MW direct drive multi-unit PMSM. IEEE Trans Magn, 2007, 48: 3323–3326

    Article  Google Scholar 

  12. Schrefler B, Gori R. The effects of strand transposition on the stiffness matrix of superconductor core elements. IEEE Trans Magn, 1988, 24:1037–1040

    Article  Google Scholar 

  13. Walters C R. Magnetization and design of multistrand superconducting conductors. IEEE Trans Magn, 1975, 11: 328–331

    Article  Google Scholar 

  14. Haldemann J. Transpositions in stator bars of large turbogenerators. IEEE Trans Energy Convers, 2004, 19: 553–560

    Article  Google Scholar 

  15. Fujita M, Kabata Y, Tokumasu T, et al. Circulating currents in stator coils of large turbine generators and loss reduction. IEEE Trans Ind Appl, 2009, 45: 685–692

    Article  Google Scholar 

  16. Bernard B J, Brenner W C. Transpositions in turbogenerator coil sides short circuited at each end. IEEE Trans Power Appara Syst, 1970, PAS-89: 1915–1921

    Google Scholar 

  17. Yuan H, Mei N, Li Y, et al. Theoretical and experimental investigation on a liquid-gas ejector power cycle using ammonia-water. Sci China Tech Sci, 2013, 56: 2289–2298

    Article  Google Scholar 

  18. Hao L L, Wu J Y, Sun Y G, et al. Simplified mathematical model of inter-turn short circuit of field windings in hydro-generators and its application. Sci China Tech Sci, 2013, 56: 898–909

    Article  Google Scholar 

  19. Liang Y P, Yu H H, Bian X. Analysis and calculation of slot leakage reactance in stator bar strands of deficient transposition. J Compel, 2013, 32: 1098–1111

    Article  Google Scholar 

  20. Du C X, Gui W H, Zhou G H. Excessive losses and temperature field calculation of stator coil bars in air-cooled large hydro-generators. Proc CSEE, 2012, 32: 111–119

    Google Scholar 

  21. Abbaszadeh K, Alam F R. Circulating current analysis between strands in armature winding of a turbo-generator using analytical model. Turk J Electr Eng Co, 2013, 21: 55–70

    Google Scholar 

  22. Tang R Y, Xu G R, Tian L J,et al. Calculation of end region magnetic field and circulating losses for turbo-generators using a coupled field and circuit equation method. IEEE Trans Magn, 1990, 26: 497–500

    Article  Google Scholar 

  23. Takahashi K, Takahashi M, Sato M. Calculation method for strand current distributions in armature winding of a turbine generator. Elect Eng Jap, 2003, 143: 323–329

    Article  Google Scholar 

  24. Liang Y P, Huang H, Li L H, et al. Numerical calculation of end region of large air-cooled turbogenerator. Proc CSEE, 2007, 27: 73–77

    Google Scholar 

  25. Liang Y P, Bian X, Yu H H, et al. Analytic algorithm for strand slot leakage reactance of transposition bar in AC machine. IEEE Trans Ind Electr, 2014, 61: 5232–5240

    Article  Google Scholar 

  26. Bian X, Liang Y P. Circuit network model of stator transposition bar in large generators and calculation of circulating current. IEEE Trans Ind Electr, 2015, 62: 1392–1399

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080, China

    YanPing Liang, Lei Wu, Xu Bian & HongHao Yu

Authors
  1. YanPing Liang
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Lei Wu
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Xu Bian
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. HongHao Yu
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to YanPing Liang.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Liang, Y., Wu, L., Bian, X. et al. Numerical calculation for circulating current in stator transposition bars of large water-cooled turbo-generators. Sci. China Technol. Sci. 58, 1053–1061 (2015). https://doi.org/10.1007/s11431-015-5810-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11431-015-5810-7

Keywords

Search

Navigation