Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables

During the service period of low-voltage nuclear cables, multiple stresses influence the aging of polymeric materials of cables. Thermal and radiation stresses are considered service aging factors in qualification tests, while the standards usually do not prescribe mechanical stress. CSPE/XLPE insul...

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Autores principales:	Ramy S. A. Afia, Ehtasham Mustafa, Zoltán Ádám Tamus
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nuclear power plant thermal degradation thermal-mechanical aging low-voltage cables polymer degradation dielectric spectroscopy Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/80bd99c7fba64f8c87306f3ef017bd0e
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spelling	oai:doaj.org-article:80bd99c7fba64f8c87306f3ef017bd0e2021-11-25T17:24:00ZComparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables10.3390/electronics102227282079-9292https://doaj.org/article/80bd99c7fba64f8c87306f3ef017bd0e2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/22/2728https://doaj.org/toc/2079-9292During the service period of low-voltage nuclear cables, multiple stresses influence the aging of polymeric materials of cables. Thermal and radiation stresses are considered service aging factors in qualification tests, while the standards usually do not prescribe mechanical stress. CSPE/XLPE insulated nuclear cable samples were exposed to thermal and combined thermo-mechanical aging for more than 1200 h at 120 °C. The real and imaginary parts of permittivity were measured in the 200 μHz to 50 mHz range as dielectric properties. The Shore D hardness of the samples was measured to analyze the mechanical characteristics of the cable. To characterize the dielectric spectrum, derived quantities, namely central real and imaginary permittivities and real and imaginary permittivities’ central frequencies were calculated. The change of dielectric spectra did not show a clear trend with aging, but the imaginary permittivity’s central frequency was higher by 0.5 mHz in the case of thermo-mechanically aged samples. The Shore D hardness was also higher on the thermo-mechanically aged samples. These findings show the combined aging has a higher impact on the insulation properties. Hence, involving the mechanical stress in the aging procedure of cable qualification enables the design of more robust cables in a harsh environment.Ramy S. A. AfiaEhtasham MustafaZoltán Ádám TamusMDPI AGarticlenuclear power plantthermal degradationthermal-mechanical aginglow-voltage cablespolymer degradationdielectric spectroscopyElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2728, p 2728 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nuclear power plant thermal degradation thermal-mechanical aging low-voltage cables polymer degradation dielectric spectroscopy Electronics TK7800-8360
spellingShingle	nuclear power plant thermal degradation thermal-mechanical aging low-voltage cables polymer degradation dielectric spectroscopy Electronics TK7800-8360 Ramy S. A. Afia Ehtasham Mustafa Zoltán Ádám Tamus Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
description	During the service period of low-voltage nuclear cables, multiple stresses influence the aging of polymeric materials of cables. Thermal and radiation stresses are considered service aging factors in qualification tests, while the standards usually do not prescribe mechanical stress. CSPE/XLPE insulated nuclear cable samples were exposed to thermal and combined thermo-mechanical aging for more than 1200 h at 120 °C. The real and imaginary parts of permittivity were measured in the 200 μHz to 50 mHz range as dielectric properties. The Shore D hardness of the samples was measured to analyze the mechanical characteristics of the cable. To characterize the dielectric spectrum, derived quantities, namely central real and imaginary permittivities and real and imaginary permittivities’ central frequencies were calculated. The change of dielectric spectra did not show a clear trend with aging, but the imaginary permittivity’s central frequency was higher by 0.5 mHz in the case of thermo-mechanically aged samples. The Shore D hardness was also higher on the thermo-mechanically aged samples. These findings show the combined aging has a higher impact on the insulation properties. Hence, involving the mechanical stress in the aging procedure of cable qualification enables the design of more robust cables in a harsh environment.
format	article
author	Ramy S. A. Afia Ehtasham Mustafa Zoltán Ádám Tamus
author_facet	Ramy S. A. Afia Ehtasham Mustafa Zoltán Ádám Tamus
author_sort	Ramy S. A. Afia
title	Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
title_short	Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
title_full	Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
title_fullStr	Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
title_full_unstemmed	Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables
title_sort	comparison of mechanical and low-frequency dielectric properties of thermally and thermo-mechanically aged low voltage cspe/xlpe nuclear power plant cables
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/80bd99c7fba64f8c87306f3ef017bd0e
work_keys_str_mv	AT ramysaafia comparisonofmechanicalandlowfrequencydielectricpropertiesofthermallyandthermomechanicallyagedlowvoltagecspexlpenuclearpowerplantcables AT ehtashammustafa comparisonofmechanicalandlowfrequencydielectricpropertiesofthermallyandthermomechanicallyagedlowvoltagecspexlpenuclearpowerplantcables AT zoltanadamtamus comparisonofmechanicalandlowfrequencydielectricpropertiesofthermallyandthermomechanicallyagedlowvoltagecspexlpenuclearpowerplantcables
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Comparison of Mechanical and Low-Frequency Dielectric Properties of Thermally and Thermo-Mechanically Aged Low Voltage CSPE/XLPE Nuclear Power Plant Cables

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