Browse > Article
http://dx.doi.org/10.5370/JEET.2018.13.6.2292

Analysis and Correction of Through-bolt End-region Overheating and Breakdown Failure in a Large Tubular Hydro-generator  

Zhou, Zhi-ting (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Fan, Zhen-nan (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Li, Jian-fu (Dong Fang Electrical Machinery Co., Ltd.)
Wen, Kun (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Zhang, Bide (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Wang, Tao (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Xia, Yan-kun (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Sun, Zhang (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Yao, Bing (The Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University)
Publication Information
Journal of Electrical Engineering and Technology / v.13, no.6, 2018 , pp. 2292-2300 More about this Journal
Abstract
A field-circuit coupling model of a typical faulty generator is established to correct through-bolt end-region overheating and breakdown failure in a tubular hydro-generator. Using the model, eddy current loss and electromagnetic forces on through bolts under normal and failure conditions are analyzed and compared and the natural frequency of a through bolt is determined. Based on the analysis results, the causative mechanism of failure is revealed and targeted improvement design measures are proposed. The numerical results are found to be consistent with the actual fault characteristics, validating the design measure improvements. The results are useful in improving the design and manufacturing standards and enhancing the operational reliability of large tubular hydro-generators.
Keywords
Failure analysis; Hydroelectric generators; Eddy currents; Electromagnetic forces;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Fan, Z., Liao, Y., Han, L., and Xie, L.D., "No-load voltage waveform optimization and damper bars heat reduction of tubular hydro-generator by different degree of adjusting damper bar pitch and skewing stator slot," IEEE Trans. on Energy Conversion., 2013, vol. 28, no. 3, pp. 461-469.   DOI
2 Zhen-nan, F., Li-Han, Yong, L., Li-dan, X., Kun, W., Jun, W., Xiu-cheng, D., and Bing, Y., "Effect of damper winding and stator slot skewing structure on no-load voltage waveform distortion and damper bar heat in large tubular hydro generator," IEEE Access, 2018, vol. 6, no. 1, pp. 22281-22291.   DOI
3 Baojun, G.E., Mingzhe, L., Yutian, S.U.N., Jinxiang, L., and Lijie, H.U., 'Calculation of damper winding current for synchronous generators under asymmetric conditions," Proc. CSEE., 2013, vol. 33, no. 27, pp. 153-161.
4 Xia, H., Yao, Y., and Ni, G., "Analysis of ventilation fluid field and rotor temperature field of a generator," Electric Machines and Control., 2007, vol. 11, no. 5, pp. 472-476.   DOI
5 Weili, L., Zhang, Y., and Yonghong, C., "Calculation and analysis of heat transfer coefficients and temperature fields of air-cooled large hydrogenerator rotor excitation windings," IEEE Trans. on Energy Conversion., 2011, vol. 26, no. 3, pp. 946-952.   DOI
6 Weili, L., Chunwei, G., and Yuhong, C., "Influence of rotation on rotor fluid and temperature distribution in a large air-cooled hydrogenerator [J]," IEEE Trans On Energy Conversion., 2012, vol. 28, no. 1, pp. 117-124.   DOI
7 Hu, M.Q., and Huang, X.L., "Numerical computation method and its application of electric machine performance," (Southeast University Press, 2003, pp. 16-30).
8 Traxler-Samek, G., Lugand, S., and Schwery, A.: "Add loss in the damper winding of large hydrogenerator at open-circuit and load conditions," IEEE Trans. on Industrial Electronics., 2010, vol. 57, no. 1, pp. 154-160.   DOI
9 Knight, A.M., Karmaker, H., and Weeber, K., "Prediction of damper winding currents and force harmonic components in large synchronous machines," Proc. 15th ICEM, Brugge, West Flanders, Belgium, 2002, vol. 35.
10 Knight, AM., Karmaker, H., and Weeber, K., "Use of a permeance model to predict force harmonic components and damper winding effects in salient pole synchronous machines," IEEE Trans. on Energy Conversion., 2002, vol. 17, no. 4, pp. 478-484.   DOI
11 Sarikhani, A., Nejadpak, A., and Mohammed, O.A., "Coupled field-circuit estimation of operational inductance in PM synchronous machines by a realtime physics-based inductance observer," IEEE Trans. on Magnetics., 2013, 49, (5), pp. 2283-2286.   DOI
12 Keller, S., Xuan, M. T., Simond, J. J., and Chewry, A., "Large low-speed hydro-generator-unbalanced magnetic pulls and additional damper losses in eccentricity conditions," IET Electr. Power Appl., 2007, vol. 21, no. 5, pp. 657-664.
13 Keller, S., Xuan, N.T., and Simond, J.J., "Computation of the no-load voltage waveform of laminated salient-pole synchronous generators," IEEE Trans. on Industry Appl., 2006, vol. 42, no. 3, pp. 681-687.   DOI
14 Kim, C.E., and Skyulski, J.K., "Harmonic analysis of output voltage in synchronous generator using finite element method taking account of the movement," IEEE Trans on Magnetics., 2002, vol. 38, no. 2, pp. 1249-1252.   DOI
15 SWang, S., Wang, X., Wang, Y., Li, P., Su, W., Ma, and Zhang, G., "Steady-state performance of synchronous generators with ac and dc stator connections considering saturation," IEEE Trans. on Energy Conversion., 2002, vol. 17, no. 2, pp. 176-182.   DOI
16 Piriou, F., and Razek, A., "Finite element analysis in electromagnetic systems accounting for electric circuits," IEEE Trans on Magnetics., 1993, vol. 29, no. 2, pp. 1669-1675.   DOI
17 Huangfu, Y., Wang, S., Qiu, J.,Zhang, H., Wang, G., and Zhu, J., "Transient performance analysis of induction motor using field-circuit coupled finiteelement method," IEEE Trans. on Magnetics., 2014, 50, (2), pp. 2283-2286.
18 Keranen, J., Ponomarev, P., Pippuri, J., et al.: 'Parallel performance of multi-slice finite-element modeling of skewed electrical machines," IEEE Trans on Magnetics, 2017, vol. 53, no. 6, pp. 1204-1207.
19 Weilharter, B., Biro, O., Rainer, S., Stermecki, A.: 'Computation of rotating force waves in skewed induction machines using multi-slice models," IEEE Trans on Magnetics, 2011, vol. 47, no. 5, pp. 1046-1049.   DOI