Fault Analysis of 600MW Generator Stator Bars in a Power Station

Fang Yuan

doi:doi:10.11648/j.jeee.20241205.12

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Fault Analysis of 600MW Generator Stator Bars in a Power Station

Fang Yuan^*

Published in Journal of Electrical and Electronic Engineering (Volume 12, Issue 5)

Received: 7 November 2024 Accepted: 21 December 2024 Published: 27 December 2024

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Abstract

The stator bar, as the component connecting the coils in the generator to the external circuit, is the main carrier of current and electric field. It is hailed as the "heart" of the generator and plays a crucial role in it. Based on the specific fault phenomena of the stator bar of a 600MW large power station generator under complex operating conditions, this paper analyzes the fault causes in combination with the disassembly inspection. The direct cause of the fault is determined to be the grounding of the stator bar and the iron core. Furthermore, a three-dimensional numerical model of the stator bar is constructed based on the high-precision finite element analysis method, focusing on internal defects and their mechanism of partial discharge characteristics. It is pointed out that internal defects caused by different reasons will lead to increased partial discharge at the defects, and the main insulation will deteriorate due to the continuous influence of partial discharge during operation. The research and analysis results can provide a reference for the operation, maintenance, and fault diagnosis of the same type of stator bars to a certain extent, and have positive significance for promoting the continuous optimization, improvement, and professional management of the same type of equipment.

Published in	Journal of Electrical and Electronic Engineering (Volume 12, Issue 5)
DOI	10.11648/j.jeee.20241205.12
Page(s)	98-106
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Stator Bar, Air Gap Defect, Failure Analysis

References

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[2]	Liu Xiangdong, Xiao Fafu, Huang Minghao, et al. Insulation Breakdown Fault Analysis of Stator Bar for Pumped Storage Generator. Water Resources and Power, 2020, 38(12): 145-148, 175.
[3]	Han Lin, Pan Zhongping. Diagnosis and Countermeasures of Stator Winding Faults of Hydro-generators. Large Electric Machine and Hydraulic Turbine, 2021, (6): 44-46, 74. https://doi.org/10.3969/j.issn.1000-3983.2021.06.008
[4]	Gao Zongbao, Wu Guangning, Jiang Jian ming, et al. Analysis and Research on Stator Earthing Fault of Large Hydro-generator Set, Electrotechnical Application, 2017, 36(23): 46-50.
[5]	Ning Guoxing. Cause Analysis and Prevention of Stator Rotor Insulation Failure of Hydrogenerator. China Water Resources, 2012, (12): 33-34. https://doi.org/10.3969/j.issn.1000-1123.2012.12.015
[6]	Tan Liming, Yin Xianggen, Wang Yikai, et al. An Adaptive Load-Based Location Method of Stator Ground Fault for Large Hydro- Generators, Transactions of China Electrotechnical Society, 2022, 37(17): 4411- 4422. https://doi.org/10.19595/j.cnki.1000-6753.tces.211155
[7]	Qiao Jian, Yin Xianggen, Wang Yikai, et al. Slot potential based stator grounding fault location method for large generator. Electric Power Automation Equipment, 2022, 42(11): 204-210, 217. https://doi.org/10.16081/j.epae.202204003
[8]	Pan Jiannan, Li Haoliang. Analysis of Insulation Breakdown Caused by Interlayer Strip Defect of Generator Stator Bar. Large Electric Machine and Hydraulic Turbine. 2022, (06): 43-47+54. https://doi.org/10.3969/j.issn.1000-3983.2022.06.008
[9]	Chen Junwei, Li Jianfa. Analysis on the Cause of Short Circuit Fault in Generator Stator Winding. Electric Engineering. 2018, (13): 78-79. https://doi.org/10.3969/j.issn.1002-1388.2018.13.026
[10]	Hou Xiaohu, Zhang Ke, Gong Linping. A new method of generator stator grounding fault location based on phasor analysis. Mechanical & Electrical Technique of Hydropower Station. 2021, 44(11): 4-7. https://doi.org/10.13599/j.cnki.11-5130.2021.11.002
[11]	Han Jianbo, Wang Jisheng, Wang Xiaoyu. Analysis and treatment of stator rod corona of large pump motor. Mechanical & Electrical Technique of Hydropower Station. 2023, 46(01): 55-57. https://doi.org/10.13599/j.cnki.11-5130.2023.01.017
[12]	Zhang Hong, Wu Mingbo, Zhang Xingming, et al. An Insulation Fault Detection Method of Generator Stator Core Based on Data Analysis. Hydropower and Pumped Storage. 2022, 8(3): 78-80. https://doi.org/10.3969/j.issn.2096-093X.2022.03.016
[13]	Hu Jianglin, Zhang Xi, Song Zhan, et al. Recognition Method of Partial Discharge Spectrum Feature in Generator Stator Bar Based on Random Forest. High Voltage Engineering. 2024, 50(3): 1272-1280. https://doi.org/10.13336/j.1003-6520.hve.20230218
[14]	Li Hongfei, Gao Zongbao, Cai Youwei, et al. Analysis of discharge faults in stator windings of simulated large hydroelectric generators and its application simulation research on real wire rod model. Electric Power Technology and Environmental Protection. 2023, 39(3): 207-214. https://doi.org/ 10.19944/j.eptep.1674-8069.2023.03.004
[15]	Liu Ling, Zhang Yu, Jin Dongsong, et al. Mechanism of Insulation Deterioration of Large Generator Stator Bars Eroded by Metal Impurities. 2022, 56(6): 104-111, 194. https://doi.org/10.7652/xjtuxb202206013

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APA Style

Yuan, F. (2024). Fault Analysis of 600MW Generator Stator Bars in a Power Station. Journal of Electrical and Electronic Engineering, 12(5), 98-106. https://doi.org/10.11648/j.jeee.20241205.12

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ACS Style

Yuan, F. Fault Analysis of 600MW Generator Stator Bars in a Power Station. J. Electr. Electron. Eng. 2024, 12(5), 98-106. doi: 10.11648/j.jeee.20241205.12

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AMA Style

Yuan F. Fault Analysis of 600MW Generator Stator Bars in a Power Station. J Electr Electron Eng. 2024;12(5):98-106. doi: 10.11648/j.jeee.20241205.12

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@article{10.11648/j.jeee.20241205.12,
  author = {Fang Yuan},
  title = {Fault Analysis of 600MW Generator Stator Bars in a Power Station
},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {12},
  number = {5},
  pages = {98-106},
  doi = {10.11648/j.jeee.20241205.12},
  url = {https://doi.org/10.11648/j.jeee.20241205.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20241205.12},
  abstract = {The stator bar, as the component connecting the coils in the generator to the external circuit, is the main carrier of current and electric field. It is hailed as the "heart" of the generator and plays a crucial role in it. Based on the specific fault phenomena of the stator bar of a 600MW large power station generator under complex operating conditions, this paper analyzes the fault causes in combination with the disassembly inspection. The direct cause of the fault is determined to be the grounding of the stator bar and the iron core. Furthermore, a three-dimensional numerical model of the stator bar is constructed based on the high-precision finite element analysis method, focusing on internal defects and their mechanism of partial discharge characteristics. It is pointed out that internal defects caused by different reasons will lead to increased partial discharge at the defects, and the main insulation will deteriorate due to the continuous influence of partial discharge during operation. The research and analysis results can provide a reference for the operation, maintenance, and fault diagnosis of the same type of stator bars to a certain extent, and have positive significance for promoting the continuous optimization, improvement, and professional management of the same type of equipment.
},
 year = {2024}
}

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TY  - JOUR
T1  - Fault Analysis of 600MW Generator Stator Bars in a Power Station

AU  - Fang Yuan
Y1  - 2024/12/27
PY  - 2024
N1  - https://doi.org/10.11648/j.jeee.20241205.12
DO  - 10.11648/j.jeee.20241205.12
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 98
EP  - 106
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20241205.12
AB  - The stator bar, as the component connecting the coils in the generator to the external circuit, is the main carrier of current and electric field. It is hailed as the "heart" of the generator and plays a crucial role in it. Based on the specific fault phenomena of the stator bar of a 600MW large power station generator under complex operating conditions, this paper analyzes the fault causes in combination with the disassembly inspection. The direct cause of the fault is determined to be the grounding of the stator bar and the iron core. Furthermore, a three-dimensional numerical model of the stator bar is constructed based on the high-precision finite element analysis method, focusing on internal defects and their mechanism of partial discharge characteristics. It is pointed out that internal defects caused by different reasons will lead to increased partial discharge at the defects, and the main insulation will deteriorate due to the continuous influence of partial discharge during operation. The research and analysis results can provide a reference for the operation, maintenance, and fault diagnosis of the same type of stator bars to a certain extent, and have positive significance for promoting the continuous optimization, improvement, and professional management of the same type of equipment.

VL  - 12
IS  - 5
ER  -

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Author Information

Fang Yuan

Datang Hydropower Science & Technology Research Institute Co., Ltd, Nanning, China

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Plain Text BibTeX RIS

APA Style

Yuan, F. (2024). Fault Analysis of 600MW Generator Stator Bars in a Power Station. Journal of Electrical and Electronic Engineering, 12(5), 98-106. https://doi.org/10.11648/j.jeee.20241205.12

Copy | Download

ACS Style

Yuan, F. Fault Analysis of 600MW Generator Stator Bars in a Power Station. J. Electr. Electron. Eng. 2024, 12(5), 98-106. doi: 10.11648/j.jeee.20241205.12

Copy | Download

AMA Style

Yuan F. Fault Analysis of 600MW Generator Stator Bars in a Power Station. J Electr Electron Eng. 2024;12(5):98-106. doi: 10.11648/j.jeee.20241205.12

Copy | Download

@article{10.11648/j.jeee.20241205.12,
  author = {Fang Yuan},
  title = {Fault Analysis of 600MW Generator Stator Bars in a Power Station
},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {12},
  number = {5},
  pages = {98-106},
  doi = {10.11648/j.jeee.20241205.12},
  url = {https://doi.org/10.11648/j.jeee.20241205.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20241205.12},
  abstract = {The stator bar, as the component connecting the coils in the generator to the external circuit, is the main carrier of current and electric field. It is hailed as the "heart" of the generator and plays a crucial role in it. Based on the specific fault phenomena of the stator bar of a 600MW large power station generator under complex operating conditions, this paper analyzes the fault causes in combination with the disassembly inspection. The direct cause of the fault is determined to be the grounding of the stator bar and the iron core. Furthermore, a three-dimensional numerical model of the stator bar is constructed based on the high-precision finite element analysis method, focusing on internal defects and their mechanism of partial discharge characteristics. It is pointed out that internal defects caused by different reasons will lead to increased partial discharge at the defects, and the main insulation will deteriorate due to the continuous influence of partial discharge during operation. The research and analysis results can provide a reference for the operation, maintenance, and fault diagnosis of the same type of stator bars to a certain extent, and have positive significance for promoting the continuous optimization, improvement, and professional management of the same type of equipment.
},
 year = {2024}
}

Copy | Download

TY  - JOUR
T1  - Fault Analysis of 600MW Generator Stator Bars in a Power Station

AU  - Fang Yuan
Y1  - 2024/12/27
PY  - 2024
N1  - https://doi.org/10.11648/j.jeee.20241205.12
DO  - 10.11648/j.jeee.20241205.12
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 98
EP  - 106
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20241205.12
AB  - The stator bar, as the component connecting the coils in the generator to the external circuit, is the main carrier of current and electric field. It is hailed as the "heart" of the generator and plays a crucial role in it. Based on the specific fault phenomena of the stator bar of a 600MW large power station generator under complex operating conditions, this paper analyzes the fault causes in combination with the disassembly inspection. The direct cause of the fault is determined to be the grounding of the stator bar and the iron core. Furthermore, a three-dimensional numerical model of the stator bar is constructed based on the high-precision finite element analysis method, focusing on internal defects and their mechanism of partial discharge characteristics. It is pointed out that internal defects caused by different reasons will lead to increased partial discharge at the defects, and the main insulation will deteriorate due to the continuous influence of partial discharge during operation. The research and analysis results can provide a reference for the operation, maintenance, and fault diagnosis of the same type of stator bars to a certain extent, and have positive significance for promoting the continuous optimization, improvement, and professional management of the same type of equipment.

VL  - 12
IS  - 5
ER  -

Copy | Download