Reliable flux-based detection of field winding failures for salient pole synchronous generators

Jangho Yun; Sang Bin Lee; Mladen Šašić; Greg C. Stone

doi:10.1109/TEC.2019.2917622

Reliable flux-based detection of field winding failures for salient pole synchronous generators

Jangho Yun, Sang Bin Lee, Mladen Šašić, Greg C. Stone

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Failures in the field winding of synchronous generators cause degradation in performance and accelerated wear of components. A number of offline and online test methods has been developed over the years, and airgap flux monitoring has been proven to be the most effective solution for reliable detection of the fault. However, there are concerns on reduced sensitivity for cases where the number of turns per pole is large. In this letter, the fault indicators used in commercial applications for airgap flux based fault detection are analyzed for salient pole synchronous generators, and a new simplified method with improved sensitivity is proposed. Experimental testing on a 330-MW generator under controlled fault conditions is given to verify the claims. A comparative study shows that the new method can provide a simplified means of improving the sensitivity and reliability of the technology presently employed in the field.

Original language	English
Article number	2917622
Pages (from-to)	1715-1718
Number of pages	4
Journal	IEEE Transactions on Energy Conversion
Volume	34
Issue number	3
DOIs	https://doi.org/10.1109/TEC.2019.2917622
Publication status	Published - 2019 Sept

Keywords

Airgap search coil
Field winding
On-line monitoring
Salient pole synchronous generator
Turn insulation failure

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1109/TEC.2019.2917622

Cite this

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title = "Reliable flux-based detection of field winding failures for salient pole synchronous generators",

abstract = "Failures in the field winding of synchronous generators cause degradation in performance and accelerated wear of components. A number of offline and online test methods has been developed over the years, and airgap flux monitoring has been proven to be the most effective solution for reliable detection of the fault. However, there are concerns on reduced sensitivity for cases where the number of turns per pole is large. In this letter, the fault indicators used in commercial applications for airgap flux based fault detection are analyzed for salient pole synchronous generators, and a new simplified method with improved sensitivity is proposed. Experimental testing on a 330-MW generator under controlled fault conditions is given to verify the claims. A comparative study shows that the new method can provide a simplified means of improving the sensitivity and reliability of the technology presently employed in the field.",

keywords = "Airgap search coil, Field winding, On-line monitoring, Salient pole synchronous generator, Turn insulation failure",

author = "Jangho Yun and Lee, {Sang Bin} and Mladen {\v S}a{\v s}i{\'c} and Stone, {Greg C.}",

note = "Funding Information: Manuscript received July 17, 2018; accepted April 22, 2019. Date of publication May 16, 2019; date of current version August 19, 2019. This work was supported in part by the “Human Resources program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea under Grant 20174030201820, and in part by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) under Grant NRF-2016R1D1A1A09917190. Paper no. PESL-00156-2018. (Corresponding author: Sang Bin Lee.) J. Yun and S. B. Lee are with the Korea University, Seoul 02841, South Korea (e-mail: ydh7999@gmail.com; sangbinlee@korea.ac.kr). Publisher Copyright: {\textcopyright} 2019 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.",

year = "2019",

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AU - Yun, Jangho

AU - Lee, Sang Bin

AU - Šašić, Mladen

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N1 - Funding Information: Manuscript received July 17, 2018; accepted April 22, 2019. Date of publication May 16, 2019; date of current version August 19, 2019. This work was supported in part by the “Human Resources program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea under Grant 20174030201820, and in part by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) under Grant NRF-2016R1D1A1A09917190. Paper no. PESL-00156-2018. (Corresponding author: Sang Bin Lee.) J. Yun and S. B. Lee are with the Korea University, Seoul 02841, South Korea (e-mail: ydh7999@gmail.com; sangbinlee@korea.ac.kr). Publisher Copyright: © 2019 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.

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N2 - Failures in the field winding of synchronous generators cause degradation in performance and accelerated wear of components. A number of offline and online test methods has been developed over the years, and airgap flux monitoring has been proven to be the most effective solution for reliable detection of the fault. However, there are concerns on reduced sensitivity for cases where the number of turns per pole is large. In this letter, the fault indicators used in commercial applications for airgap flux based fault detection are analyzed for salient pole synchronous generators, and a new simplified method with improved sensitivity is proposed. Experimental testing on a 330-MW generator under controlled fault conditions is given to verify the claims. A comparative study shows that the new method can provide a simplified means of improving the sensitivity and reliability of the technology presently employed in the field.

AB - Failures in the field winding of synchronous generators cause degradation in performance and accelerated wear of components. A number of offline and online test methods has been developed over the years, and airgap flux monitoring has been proven to be the most effective solution for reliable detection of the fault. However, there are concerns on reduced sensitivity for cases where the number of turns per pole is large. In this letter, the fault indicators used in commercial applications for airgap flux based fault detection are analyzed for salient pole synchronous generators, and a new simplified method with improved sensitivity is proposed. Experimental testing on a 330-MW generator under controlled fault conditions is given to verify the claims. A comparative study shows that the new method can provide a simplified means of improving the sensitivity and reliability of the technology presently employed in the field.

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Reliable flux-based detection of field winding failures for salient pole synchronous generators

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Keywords

ASJC Scopus subject areas

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