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Impact of RISC positions on stator winding insulation in synchronous generators.

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Title: Impact of RISC positions on stator winding insulation in synchronous generators.
Authors: Xu, Ming-Xing1,2 (AUTHOR) starxu01@163.com, He, Yu-Ling2 (AUTHOR), Zhang, Wen2 (AUTHOR), Dai, De-Rui2 (AUTHOR), Chen, Shu-Chun1 (AUTHOR), Zhou, Han1 (AUTHOR)
Source: Electrical Engineering. Aug2025, Vol. 107 Issue 8, p10227-10240. 14p.
Subjects: Synchronous generators, Electric insulators & insulation, Finite element method, Insulating materials, Strains & stresses (Mechanics), Thermal stresses, Electromagnetic forces
Abstract: The insulation failure of synchronous generator winding is usually the early cause of short circuit fault, especially under the combined action of electromagnetic force, thermal stress and mechanical stress. This paper comprehensively investigates the mechanical–thermal response characteristics of end-winding insulation under different rotor interturn short circuit (RISC) positions in synchronous generators. Based on the magnetic–thermal–solid coupling model, not only are magnetic flux density and electromagnetic forces obtained in the stator end-winding region, but also the dynamic characteristics of deformation, stress, and strain in the winding insulation are separately calculated. Furthermore, weak locations of stress and strain concentration in the winding are identified. The entire work is grounded in qualitative theoretical analysis, finite element analysis, and experimental verification. The result shows that RISC results in non-uniform stress and temperature distributions of insulation materials, which will significantly increase the mechanical–thermal response of the winding insulation material, and aggravate the deformation, stress and strain of the insulation material. The stress at the joint and nose end of winding insulation is significantly higher. These specific locations are the dangerous point of winding insulation failure. [ABSTRACT FROM AUTHOR]
Copyright of Electrical Engineering is the property of Springer Nature 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: Impact of RISC positions on stator winding insulation in synchronous generators.
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  Data: <searchLink fieldCode="AR" term="%22Xu%2C+Ming-Xing%22">Xu, Ming-Xing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> starxu01@163.com</i><br /><searchLink fieldCode="AR" term="%22He%2C+Yu-Ling%22">He, Yu-Ling</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Wen%22">Zhang, Wen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dai%2C+De-Rui%22">Dai, De-Rui</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Shu-Chun%22">Chen, Shu-Chun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Han%22">Zhou, Han</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Electrical+Engineering%22">Electrical Engineering</searchLink>. Aug2025, Vol. 107 Issue 8, p10227-10240. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Synchronous+generators%22">Synchronous generators</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+insulators+%26+insulation%22">Electric insulators & insulation</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Insulating+materials%22">Insulating materials</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stresses%22">Thermal stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+forces%22">Electromagnetic forces</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The insulation failure of synchronous generator winding is usually the early cause of short circuit fault, especially under the combined action of electromagnetic force, thermal stress and mechanical stress. This paper comprehensively investigates the mechanical–thermal response characteristics of end-winding insulation under different rotor interturn short circuit (RISC) positions in synchronous generators. Based on the magnetic–thermal–solid coupling model, not only are magnetic flux density and electromagnetic forces obtained in the stator end-winding region, but also the dynamic characteristics of deformation, stress, and strain in the winding insulation are separately calculated. Furthermore, weak locations of stress and strain concentration in the winding are identified. The entire work is grounded in qualitative theoretical analysis, finite element analysis, and experimental verification. The result shows that RISC results in non-uniform stress and temperature distributions of insulation materials, which will significantly increase the mechanical–thermal response of the winding insulation material, and aggravate the deformation, stress and strain of the insulation material. The stress at the joint and nose end of winding insulation is significantly higher. These specific locations are the dangerous point of winding insulation failure. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Electrical Engineering is the property of Springer Nature 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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        Value: 10.1007/s00202-025-03024-8
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      – Code: eng
        Text: English
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        Type: general
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      – SubjectFull: Finite element method
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      – SubjectFull: Insulating materials
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Thermal stresses
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      – SubjectFull: Electromagnetic forces
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      – TitleFull: Impact of RISC positions on stator winding insulation in synchronous generators.
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            NameFull: Xu, Ming-Xing
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              M: 08
              Text: Aug2025
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              Y: 2025
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