Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques
Low voltage cables play a crucial role in the safe and reliable operation of nuclear power plants. This paper discusses the effect of simultaneous combined thermal and mechanical stresses on the overall insulation of unshielded low voltage power cables used in nuclear power plants. Cable samples bas...
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| Format: | Article |
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IEEE
2021-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9311231/ |
| _version_ | 1818579333214633984 |
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| author | Ramy S. A. Afia Mustafa Ehtasham Zoltan Adam Tamus |
| author_facet | Ramy S. A. Afia Mustafa Ehtasham Zoltan Adam Tamus |
| author_sort | Ramy S. A. Afia |
| collection | DOAJ |
| description | Low voltage cables play a crucial role in the safe and reliable operation of nuclear power plants. This paper discusses the effect of simultaneous combined thermal and mechanical stresses on the overall insulation of unshielded low voltage power cables used in nuclear power plants. Cable samples based on XLPE/CSPE insulation were exposed to thermal-mechanical combined accelerated aging tests for an extended period lasted to 907 hours. Time and frequency domain dielectric spectroscopy were applied to reveal the degradation level of the core insulation and jacket due to combined stresses. The former technique was conducted through the measurement of the decay and return voltage slopes, while the latter technique was based on the measurement of the complex permittivity. Moreover, the mechanical properties of the cable insulation were investigated by applying the measurement of the Shore D hardness. The results showed that the combined aging affects both the electrical and mechanical properties of the overall insulation. The complex permittivity at 100 Hz, the decay voltage slope, and the hardness had an upward trend with aging, while the return voltage slope showed an inverse trend. In addition, the results of the electrical and mechanical measurements showed strong correlation with aging time and further correlation was observed between the dielectric and mechanical properties. The correlation between aging time and test results suggests that the presented test methods are promising tools for in situ condition monitoring of low voltage unshielded cables in nuclear power plants. |
| first_indexed | 2024-12-16T07:00:02Z |
| format | Article |
| id | doaj.art-16fa40f0e20c4b7dbc02202ba9aed793 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-16T07:00:02Z |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-16fa40f0e20c4b7dbc02202ba9aed7932022-12-21T22:40:11ZengIEEEIEEE Access2169-35362021-01-0194531454110.1109/ACCESS.2020.30481899311231Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test TechniquesRamy S. A. Afia0https://orcid.org/0000-0002-2455-1259Mustafa Ehtasham1https://orcid.org/0000-0002-3232-6115Zoltan Adam Tamus2https://orcid.org/0000-0002-0092-7565Department of Electrical Power and Machines Engineering, Faculty of Engineering, Helwan University, Cairo, EgyptDepartment of Electrical Engineering, Faculty of Engineering and Technology, Gomal University, Dera Ismail Khan, PakistanDepartment of Electric Power Engineering, Budapest University of Technology and Economics, Budapest, HungaryLow voltage cables play a crucial role in the safe and reliable operation of nuclear power plants. This paper discusses the effect of simultaneous combined thermal and mechanical stresses on the overall insulation of unshielded low voltage power cables used in nuclear power plants. Cable samples based on XLPE/CSPE insulation were exposed to thermal-mechanical combined accelerated aging tests for an extended period lasted to 907 hours. Time and frequency domain dielectric spectroscopy were applied to reveal the degradation level of the core insulation and jacket due to combined stresses. The former technique was conducted through the measurement of the decay and return voltage slopes, while the latter technique was based on the measurement of the complex permittivity. Moreover, the mechanical properties of the cable insulation were investigated by applying the measurement of the Shore D hardness. The results showed that the combined aging affects both the electrical and mechanical properties of the overall insulation. The complex permittivity at 100 Hz, the decay voltage slope, and the hardness had an upward trend with aging, while the return voltage slope showed an inverse trend. In addition, the results of the electrical and mechanical measurements showed strong correlation with aging time and further correlation was observed between the dielectric and mechanical properties. The correlation between aging time and test results suggests that the presented test methods are promising tools for in situ condition monitoring of low voltage unshielded cables in nuclear power plants.https://ieeexplore.ieee.org/document/9311231/Accelerated combined agingCSPEdielectric spectroscopyextended voltage responselow-voltage cablesShore D hardness |
| spellingShingle | Ramy S. A. Afia Mustafa Ehtasham Zoltan Adam Tamus Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques IEEE Access Accelerated combined aging CSPE dielectric spectroscopy extended voltage response low-voltage cables Shore D hardness |
| title | Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques |
| title_full | Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques |
| title_fullStr | Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques |
| title_full_unstemmed | Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques |
| title_short | Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques |
| title_sort | electrical and mechanical condition assessment of low voltage unshielded nuclear power cables under simultaneous thermal and mechanical stresses application of non destructive test techniques |
| topic | Accelerated combined aging CSPE dielectric spectroscopy extended voltage response low-voltage cables Shore D hardness |
| url | https://ieeexplore.ieee.org/document/9311231/ |
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