Dielectric analysis of degraded stator bars of a hydro generator

This paper presents the investigation of dielectric analysis of degraded stator bars by Polarization and Depolarization Current (PDC) measurement. The stator bars obtained from the 30-year in-service synchronous machine were divided into two groups. The first group was the unmodified stator bars. Th...

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Autores principales:	Norasage Pattanadech, Natnaree Phumipunepon, Chissanupong Srinangyam, Siwakorn Jeenmuang, Chanin Bunlaksananusorn
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Polarization and depolarization current Rdc C ratio Polarization loss factor Conduction loss factor Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/a9be7851333b4731ac99e255d13dbdfc
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spelling	oai:doaj.org-article:a9be7851333b4731ac99e255d13dbdfc2021-12-04T04:35:08ZDielectric analysis of degraded stator bars of a hydro generator2352-484710.1016/j.egyr.2021.11.143https://doaj.org/article/a9be7851333b4731ac99e255d13dbdfc2022-04-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721012907https://doaj.org/toc/2352-4847This paper presents the investigation of dielectric analysis of degraded stator bars by Polarization and Depolarization Current (PDC) measurement. The stator bars obtained from the 30-year in-service synchronous machine were divided into two groups. The first group was the unmodified stator bars. The second group was the simulated degradation stator bars which were composed of the thermal stress stator bars, conductive tap abrasion stator bars, multiple air cavity stator bars, multiple oil filled stator bars and multiple water filled stator bars. PDC test experiment was performed with the stator bar samples. PDC test results were analyzed in time domain and in frequency domain with the derived parameters i.e. Rdc, real and imaginary part of complex capacitance, C ratio, conduction loss factor and polarization loss factor. It was found that PDC shapes obtained from the conductive tape abrasion stator bar and multiple water filled cavity stator bar were clearly different from that of the unmodified stator bar. For other case studies, the derived parameters showed the usefulness in analysis the degraded stator bar characteristics. For example, the increase in the imaginary capacitance and conduction loss factor can be observed from most cases of degraded stator bar test results.Norasage PattanadechNatnaree PhumipuneponChissanupong SrinangyamSiwakorn JeenmuangChanin BunlaksananusornElsevierarticlePolarization and depolarization currentRdcC ratioPolarization loss factorConduction loss factorElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 8, Iss , Pp 313-321 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Polarization and depolarization current Rdc C ratio Polarization loss factor Conduction loss factor Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Polarization and depolarization current Rdc C ratio Polarization loss factor Conduction loss factor Electrical engineering. Electronics. Nuclear engineering TK1-9971 Norasage Pattanadech Natnaree Phumipunepon Chissanupong Srinangyam Siwakorn Jeenmuang Chanin Bunlaksananusorn Dielectric analysis of degraded stator bars of a hydro generator
description	This paper presents the investigation of dielectric analysis of degraded stator bars by Polarization and Depolarization Current (PDC) measurement. The stator bars obtained from the 30-year in-service synchronous machine were divided into two groups. The first group was the unmodified stator bars. The second group was the simulated degradation stator bars which were composed of the thermal stress stator bars, conductive tap abrasion stator bars, multiple air cavity stator bars, multiple oil filled stator bars and multiple water filled stator bars. PDC test experiment was performed with the stator bar samples. PDC test results were analyzed in time domain and in frequency domain with the derived parameters i.e. Rdc, real and imaginary part of complex capacitance, C ratio, conduction loss factor and polarization loss factor. It was found that PDC shapes obtained from the conductive tape abrasion stator bar and multiple water filled cavity stator bar were clearly different from that of the unmodified stator bar. For other case studies, the derived parameters showed the usefulness in analysis the degraded stator bar characteristics. For example, the increase in the imaginary capacitance and conduction loss factor can be observed from most cases of degraded stator bar test results.
format	article
author	Norasage Pattanadech Natnaree Phumipunepon Chissanupong Srinangyam Siwakorn Jeenmuang Chanin Bunlaksananusorn
author_facet	Norasage Pattanadech Natnaree Phumipunepon Chissanupong Srinangyam Siwakorn Jeenmuang Chanin Bunlaksananusorn
author_sort	Norasage Pattanadech
title	Dielectric analysis of degraded stator bars of a hydro generator
title_short	Dielectric analysis of degraded stator bars of a hydro generator
title_full	Dielectric analysis of degraded stator bars of a hydro generator
title_fullStr	Dielectric analysis of degraded stator bars of a hydro generator
title_full_unstemmed	Dielectric analysis of degraded stator bars of a hydro generator
title_sort	dielectric analysis of degraded stator bars of a hydro generator
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/a9be7851333b4731ac99e255d13dbdfc
work_keys_str_mv	AT norasagepattanadech dielectricanalysisofdegradedstatorbarsofahydrogenerator AT natnareephumipunepon dielectricanalysisofdegradedstatorbarsofahydrogenerator AT chissanupongsrinangyam dielectricanalysisofdegradedstatorbarsofahydrogenerator AT siwakornjeenmuang dielectricanalysisofdegradedstatorbarsofahydrogenerator AT chaninbunlaksananusorn dielectricanalysisofdegradedstatorbarsofahydrogenerator
_version_	1718372987243069440

Dielectric analysis of degraded stator bars of a hydro generator

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