High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties
This paper aims to investigate the influence of thermal aging on a crosslinked polyethylene (XLPE) cable, and the relationships between the macroscopical high-voltage dielectric and the microscopical physicochemical properties are also elucidated. To better simulate thermal aging under working condi...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/17/3519 |
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| author | Haoyue Wang Maolun Sun Kaijie Zhao Xiaowei Wang Qilong Xu Wei Wang Chengrong Li |
| author_facet | Haoyue Wang Maolun Sun Kaijie Zhao Xiaowei Wang Qilong Xu Wei Wang Chengrong Li |
| author_sort | Haoyue Wang |
| collection | DOAJ |
| description | This paper aims to investigate the influence of thermal aging on a crosslinked polyethylene (XLPE) cable, and the relationships between the macroscopical high-voltage dielectric and the microscopical physicochemical properties are also elucidated. To better simulate thermal aging under working condition, the medium-voltage-level cable is subjected to accelerated inner thermal aging for different aging times. Then, high-voltage frequency domain spectroscopy (FDS) (cable sample) and analyses of microscopic physical and chemical properties (sampling from the cable), including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and elongation at the break (EAB), are conducted at different cable aging stages. The dielectric test results show that after a certain aging time, the high-voltage FDS curves of the cable have layered characteristics, and this phenomenon is more obvious as the aging degree increases. Moreover, the slope and the integral of the high-voltage FDS curves rise with aging time. The mechanism is deduced by the physicochemical results that thermo-oxidative aging results in increasing polar groups and dislocation defects in the crystal region, which leads to the above phenomenon. On the one hand, the appearance of polar groups increases the density of the dipole. On the other hand, the destruction of the crystal region increases the probability and amplitude of dipole reversal. In addition, the breaking of molecular bonds and the increase in the amorphous phase also reduce the rigidity of the XLPE molecular main chain. The above factors lead to obvious delamination and larger dielectric parameters of the thermally aged cable. Finally, according to the experimental results, an on-site diagnosis method of cable insulation thermal aging based on high-voltage FDS is discussed. |
| first_indexed | 2024-03-10T01:22:29Z |
| format | Article |
| id | doaj.art-f1a158be027941988134950f48e3a0af |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T01:22:29Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-f1a158be027941988134950f48e3a0af2023-11-23T13:58:13ZengMDPI AGPolymers2073-43602022-08-011417351910.3390/polym14173519High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical PropertiesHaoyue Wang0Maolun Sun1Kaijie Zhao2Xiaowei Wang3Qilong Xu4Wei Wang5Chengrong Li6State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, ChinaState Grid Shandong Electric Power Company, Heze 274000, ChinaHohhot Power Supply Bureau of Inner Mongolia Power (Group) Co., Ltd., Hohhot 010010, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, ChinaThis paper aims to investigate the influence of thermal aging on a crosslinked polyethylene (XLPE) cable, and the relationships between the macroscopical high-voltage dielectric and the microscopical physicochemical properties are also elucidated. To better simulate thermal aging under working condition, the medium-voltage-level cable is subjected to accelerated inner thermal aging for different aging times. Then, high-voltage frequency domain spectroscopy (FDS) (cable sample) and analyses of microscopic physical and chemical properties (sampling from the cable), including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and elongation at the break (EAB), are conducted at different cable aging stages. The dielectric test results show that after a certain aging time, the high-voltage FDS curves of the cable have layered characteristics, and this phenomenon is more obvious as the aging degree increases. Moreover, the slope and the integral of the high-voltage FDS curves rise with aging time. The mechanism is deduced by the physicochemical results that thermo-oxidative aging results in increasing polar groups and dislocation defects in the crystal region, which leads to the above phenomenon. On the one hand, the appearance of polar groups increases the density of the dipole. On the other hand, the destruction of the crystal region increases the probability and amplitude of dipole reversal. In addition, the breaking of molecular bonds and the increase in the amorphous phase also reduce the rigidity of the XLPE molecular main chain. The above factors lead to obvious delamination and larger dielectric parameters of the thermally aged cable. Finally, according to the experimental results, an on-site diagnosis method of cable insulation thermal aging based on high-voltage FDS is discussed.https://www.mdpi.com/2073-4360/14/17/3519crosslinked polyethylene (XLPE) cablethermal agingfrequency domain spectroscopy (FDS)physicochemical propertiesdiagnosis |
| spellingShingle | Haoyue Wang Maolun Sun Kaijie Zhao Xiaowei Wang Qilong Xu Wei Wang Chengrong Li High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties Polymers crosslinked polyethylene (XLPE) cable thermal aging frequency domain spectroscopy (FDS) physicochemical properties diagnosis |
| title | High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties |
| title_full | High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties |
| title_fullStr | High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties |
| title_full_unstemmed | High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties |
| title_short | High-Voltage FDS of Thermally Aged XLPE Cable and Its Correlation with Physicochemical Properties |
| title_sort | high voltage fds of thermally aged xlpe cable and its correlation with physicochemical properties |
| topic | crosslinked polyethylene (XLPE) cable thermal aging frequency domain spectroscopy (FDS) physicochemical properties diagnosis |
| url | https://www.mdpi.com/2073-4360/14/17/3519 |
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