http://iet.metastore.ingenta.com
1887

Large low-speed hydro-generators – unbalanced magnetic pulls and additional damper losses in eccentricity conditions

Large low-speed hydro-generators – unbalanced magnetic pulls and additional damper losses in eccentricity conditions

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IET Electric Power Applications — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A combined analytical and numerical method for computation of unbalanced magnetic pulls (UMPs), damper bar currents and losses of laminated low-speed hydro-generators in eccentricity conditions under no-load is presented. The described method takes into account saturation effects and the damping effects of the damper winding in the calculation of the UMPs and the damper bar currents. The combination of magnetostatic two-dimensional (2D) finite element field calculations and an analytical resolution of electrical circuit equations results in a precise prediction of the damper bar currents and of the UMPs. At the same time, simulation time is drastically reduced compared to transient magnetic 2D finite element simulations.The presented method was verified on several examples, comparing the obtained results (damper bar currents and UMP) to the results obtained from transient magnetic finite element simulations.

References

    1. 1)
      • A.M. Knight , S.P. Bertani . Mechanical fault detection in a medium-sized induction motor using stator current monitoring. IEEE Trans. Energy Convers. , 4 , 753 - 760
    2. 2)
      • S. Nandi , R.M. Bharadwaj , H.A. Toliyat . Performance analysis of a three-phase induction motor under mixed eccentricity condition. IEEE Trans. Energy Convers. , 3 , 392 - 399
    3. 3)
      • S. Nandi , S. Ahmed , H.A. Toliyat . Detection of rotor slot and other eccentricity related harmonics in a three phase induction motor with different rotor cages. IEEE Trans. Energy Convers. , 3 , 253 - 260
    4. 4)
      • D.G. Dorrell . Experimental behaviour of unbalanced magnetic pull in 3-phase induction motors with eccentric rotors and the relationship with tooth saturation. IEEE Trans. Energy Convers. , 3 , 304 - 309
    5. 5)
      • D.G. Dorrell . Calculation of unbalanced magnetic pull in small cage induction motors with skewed rotors and dynamic rotor eccentricity. IEEE Trans. Energy Convers. , 3 , 483 - 488
    6. 6)
      • I. Tabatabaei , J. Faiz , H. Lesani , M.T. Nabavi-Razavi . Modeling and simulation of a salient-pole synchronous generator with dynamic eccentricity using modified winding function theory. IEEE Trans. Magn. , 3 , 1550 - 1555
    7. 7)
      • N. Al-Nuaim , H.A. Toliyat . A novel method for modeling air-gap eccentricity in synchronous machines based on modified winding function theory. IEEE Trans. Energy Convers. , 2 , 156 - 162
    8. 8)
      • H.A. Toliyat , N.A. Al-Nuaim . Simulation and detection of dynamic air-gap eccentricity in salient-pole synchronous machines. IEEE Trans. Ind. Appl. , 1 , 86 - 93
    9. 9)
      • Foggia, A., Torlay, J.-E., Corenwinder, C., Audoli, A., Hèrigault, J.: `Circulating current analysis in the parallel-connected windings of synchronous generators under abnormal operating conditions', Int. Conf. on Electric Machines and Drives (IEMD), May 1999, Seatle, USA.
    10. 10)
      • J.S. Hsu , J. Stein . Effects of eccentricities on shaft signals studied through windingless rotors. IEEE Trans. Energy Convers. , 3 , 564 - 571
    11. 11)
      • J.S. Hsu , J. Stein . Shaft signals of salient-pole synchronous machines for eccentricity and shorted-field-coil detections. IEEE Trans. Energy Convers. , 3 , 572 - 578
    12. 12)
      • R.L. Stoll . Simple computational model for calculating the unbalanced magnetic pull on a two-pole turbogenerator rotor due to eccentricity. IEE Proc., Electr. Power Appl. , 4 , 263 - 270
    13. 13)
      • S. Keller , M. Tu Xuan , J.-J. Simond . Computation of the no-load voltage waveform of laminated salient-pole synchronous generators. IEEE Trans. Ind. Appl. , 3 , 681 - 687
    14. 14)
      • Chatelain, J., Tu Xuan, M., Kawkabani, B.: `Damping of the unbalanced magnetic pull in machines with rotor eccentricity by using windings with parallel paths', Beijing Int. Conf. on Electrical Machines (BICEM), August 1987, Beijing, China.
    15. 15)
      • Tu Xuan, M., Simond, J.-J., Wetter, R., Keller, S.: `A novel air-gap monitoring system for large low speed hydro-generators', Proc. IEEE-PES Annual Meeting, June 2006, Montrèal, Canada.
    16. 16)
      • S.H. Minnich , M.V.K. Chari , J.F. Berkery . Operational inductances of turbine generators by the finite element method. IEEE Trans. Power Appar. Syst. , 1 , 20 - 27
    17. 17)
      • K. Vogt . (1974) Elektrische Maschinen–Berechnung rotierender elektrischer Maschinen.
    18. 18)
      • Flux, Cedrat, Grenoble, France. http://www.cedrat.com, accessed December 2006.
    19. 19)
      • S. Keller . (2007) Large low speed hydrogenerators – UMP and additional damper losses in eccentricity conditions, PhD thesis, EPFL.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa_20060504
Loading

Related content

content/journals/10.1049/iet-epa_20060504
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address