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Rotor Ground Capacitance Coupled Harmonic Fault Detection Boundary in Large Synchronous Generators.

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Title: Rotor Ground Capacitance Coupled Harmonic Fault Detection Boundary in Large Synchronous Generators.
Authors: Du, Yongbin1 duyongbin@usth.edu.cn, Chao, Wenhao1 chaowenhao@usth.edu.cn, Zhang, Qian1 zhangqian37@usth.edu.cn, Zhao, Bingbing1 zhaobingbing@usth.edu.cn
Source: Electronics & Electrical Engineering. 2026, Vol. 32 Issue 1, p15-24. 10p.
Subjects: Synchronous generators, Fault diagnosis, Nonlinear systems, Electric capacity
Abstract: Focusing on the impact of rotor-to-ground capacitance on passive ground fault detection in large-scale synchronous generators, this paper proposes an error analysis method using an amplitude deviation factor. Based on the classical equivalent circuit model of the excitation system, the proposed method explicitly incorporates the rotor-to-ground capacitance parameters. It systematically reveals the non-linear mechanism by which ground capacitance affects the harmonic voltage amplitudes of faults on both the DC and the AC sides. This study addresses the limitations of existing research, which is primarily confined to small and medium capacity machines and often neglects the ground capacitance. Verified by computer simulations and field data from large-scale units, the results demonstrate that the proposed method effectively clarifies the detection boundaries and improves fault detection accuracy in high-capacitance scenarios. [ABSTRACT FROM AUTHOR]
Copyright of Electronics & Electrical Engineering is the property of Electronics & Electrical Engineering and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Rotor Ground Capacitance Coupled Harmonic Fault Detection Boundary in Large Synchronous Generators.
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  Data: <searchLink fieldCode="AR" term="%22Du%2C+Yongbin%22">Du, Yongbin</searchLink><relatesTo>1</relatesTo><i> duyongbin@usth.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chao%2C+Wenhao%22">Chao, Wenhao</searchLink><relatesTo>1</relatesTo><i> chaowenhao@usth.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Qian%22">Zhang, Qian</searchLink><relatesTo>1</relatesTo><i> zhangqian37@usth.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Bingbing%22">Zhao, Bingbing</searchLink><relatesTo>1</relatesTo><i> zhaobingbing@usth.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Electronics+%26+Electrical+Engineering%22">Electronics & Electrical Engineering</searchLink>. 2026, Vol. 32 Issue 1, p15-24. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Synchronous+generators%22">Synchronous generators</searchLink><br /><searchLink fieldCode="DE" term="%22Fault+diagnosis%22">Fault diagnosis</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+systems%22">Nonlinear systems</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+capacity%22">Electric capacity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Focusing on the impact of rotor-to-ground capacitance on passive ground fault detection in large-scale synchronous generators, this paper proposes an error analysis method using an amplitude deviation factor. Based on the classical equivalent circuit model of the excitation system, the proposed method explicitly incorporates the rotor-to-ground capacitance parameters. It systematically reveals the non-linear mechanism by which ground capacitance affects the harmonic voltage amplitudes of faults on both the DC and the AC sides. This study addresses the limitations of existing research, which is primarily confined to small and medium capacity machines and often neglects the ground capacitance. Verified by computer simulations and field data from large-scale units, the results demonstrate that the proposed method effectively clarifies the detection boundaries and improves fault detection accuracy in high-capacitance scenarios. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Electronics & Electrical Engineering is the property of Electronics & Electrical Engineering and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Fault diagnosis
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      – SubjectFull: Nonlinear systems
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              Text: 2026
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