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Multifield Calculation and Analysis of Excitation Winding Interturn Short Circuit Fault in Turbo-Generator

Author

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  • Minghan Ma

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Yonggang Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Yucai Wu

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Chenchen Dong

    (State Grid Baoding Power Supply Conmpany, Baoding 071051, Hebei, China)

Abstract

Excitation winding interturn short circuit (EWISC) is a common fault in turbo-generators. Once the fault occurs, if not handled in time, it will result in significant security risks to the power system. Using the multifield characteristics of fault generators for a comprehensive diagnosis can make the diagnostic results more accurate and credible. In this paper, taking a TA-1100-78 type, two pole pairs turbo-generator as the research object, the two-dimensional finite element electromagnetic model of stator/rotor and the three-dimensional finite element heat transfer model of rotor were established. The electromagnetic field, temperature field, and stress field of the generator were simulated and analyzed. At the same time, the air gap magnetic field, three-dimensional temperature field, and stress field distribution of the rotor were calculated for EWISC faults in different fault degrees and positions. The results showed that the EWISC fault weakened the air gap magnetic field and caused unbalanced electromagnetic distribution. At the same time, it caused a distortion of the rotor temperature field, resulting in an unbalanced distribution of the temperature field. The stress field was affected by the distortion of temperature field, and the local thermal stress increased but did not exceed the yield limit of the material. Restorable elastic deformation occurred when the rotor was heated, which caused the thermal bending of the rotor. The method adopted in this paper can provide a reference for the calculation of multiphysical field after a generator fault. It is also pointed out that the thermal unbalance influence should not be neglected in the study of generator vibration characteristics.

Suggested Citation

  • Minghan Ma & Yonggang Li & Yucai Wu & Chenchen Dong, 2018. "Multifield Calculation and Analysis of Excitation Winding Interturn Short Circuit Fault in Turbo-Generator," Energies, MDPI, vol. 11(10), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2626-:d:173269
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    References listed on IDEAS

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    1. Luo Wang & Yonggang Li & Junqing Li, 2018. "Diagnosis of Inter-Turn Short Circuit of Synchronous Generator Rotor Winding Based on Volterra Kernel Identification," Energies, MDPI, vol. 11(10), pages 1-15, September.
    2. Dong Li & Yinghong Wen & Weili Li & Bo Feng & Junci Cao, 2018. "Three-Dimensional Temperature Field Calculation and Analysis of an Axial-Radial Flux-Type Permanent Magnet Synchronous Motor," Energies, MDPI, vol. 11(5), pages 1-21, May.
    3. Weili Li & Yong Li & Ying Su & Purui Wang & Wenmao Liu, 2018. "Research on Stator Main Insulation Temperature Field of Air-Cooled Turbo-Generator after Main Insulation Shelling," Energies, MDPI, vol. 11(5), pages 1-15, April.
    4. Ying Xie & Jinpeng Guo & Peng Chen & Zhiwei Li, 2018. "Coupled Fluid-Thermal Analysis for Induction Motors with Broken Bars Operating under the Rated Load," Energies, MDPI, vol. 11(8), pages 1-17, August.
    5. Ruhai Li & Chaoshun Li & Xuanlin Peng & Wei Wei, 2017. "Electromagnetic Vibration Simulation of a 250-MW Large Hydropower Generator with Rotor Eccentricity and Rotor Deformation," Energies, MDPI, vol. 10(12), pages 1-19, December.
    6. Guangtao Zhang & Junyong Wu & Liangliang Hao, 2018. "Analysis on the Amplitude and Frequency Characteristics of the Rotor Unbalanced Magnetic Pull of a Multi-Pole Synchronous Generator with Inter-Turn Short Circuit of Field Windings," Energies, MDPI, vol. 11(1), pages 1-20, January.
    7. Zhaobin Cao & Weili Li & Jinyang Li & Xiaochen Zhang & Dong Li & Meiwei Zhang, 2017. "Research on the Temperature Field of High-Voltage High Power Line Start Permanent Magnet Synchronous Machines with Different Rotor Cage Structure," Energies, MDPI, vol. 10(11), pages 1-14, November.
    8. Zhaobin Cao & Weili Li & Xiaochen Zhang & Yu Fan & Jianjun Zeng, 2018. "Influence of Single/Dual Ventilation Path on Fluid Field and Temperature Field of HVLSSR-PMSM with Air-Cooled Hybrid Ventilation Systems," Energies, MDPI, vol. 11(6), pages 1-15, May.
    9. Guangtao Zhang & Junyong Wu & Liangliang Hao, 2017. "Fast Calculation Model and Theoretical Analysis of Rotor Unbalanced Magnetic Pull for Inter-Turn Short Circuit of Field Windings of Non-Salient Pole Generators," Energies, MDPI, vol. 10(5), pages 1-19, May.
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    Cited by:

    1. Junqing Li & Luo Wang, 2019. "Calculation and Analysis of Rotor Thermal Static Field for Inter-Turn Short Circuit of Large Hydro-Generator Excitation Winding," Energies, MDPI, vol. 12(7), pages 1-19, April.

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