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Effect of VFTO ageing on electric strength of epoxy resin
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Shaoming PAN1, Lei ZHANG1, Jian ZHAO1, Yi SU1, Xiajin RAO1, Liangyuan CHEN1, Dajian LI2
Insulating Materials | 2024, 57(1) : 46 - 50
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Insulating Materials | 2024, 57(1): 46-50
• Material Research •
Effect of VFTO ageing on electric strength of epoxy resin
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Shaoming PAN1, Lei ZHANG1, Jian ZHAO1, Yi SU1, Xiajin RAO1, Liangyuan CHEN1, Dajian LI2
Affiliations
  • 1Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment, Electric Power Research Institute of Guangxi Power Grid Co., Ltd., Nanning 530023, China
  • 2Guangxi Power Grid Co., Ltd., Nanning 530023, China
Published: 2024-01-20 doi: 10.16790/j.cnki.1009-9239.im.2024.01.007
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In order to explore the effect of very fast transient overvoltage (VFTO) on the breakdown properties of epoxy resin, epoxy resin samples were prepared and conducted 1 000 times of VFTO ageing tests at 20 kV and 40 kV, respectively. The effects of VFTO ageing on the chemical structure, micromorphology, dielectric parameters, and breakdown properties of the epoxy resins were studied by infrared spectroscopy, scanning electron microscopy, dielectric spectroscopy, and breakdown experiment. The results show that after VFTO ageing, the contents of C-O-C bond and C=O bond in epoxy resin decrease, the internal defect increases, the relaxation behavior enhances, and the electric strength decreases. After VFTO ageing at 20 kV and 40 kV, the electric strength of epoxy resin decreases by 14.89% and 25.67%, respectively. Through analysis, it is found that after the VFTO ageing, the internal macromolecular chains of the epoxy resin were broken, leading to an increase of defects, which is the main reason for the decrease of its electric strength.

VFTO  /  epoxy resin  /  electric strength  /  electrical ageing
Shaoming PAN, Lei ZHANG, Jian ZHAO, Yi SU, Xiajin RAO, Liangyuan CHEN, Dajian LI. Effect of VFTO ageing on electric strength of epoxy resin[J]. Insulating Materials, 2024 , 57 (1) : 46 -50 . DOI: 10.16790/j.cnki.1009-9239.im.2024.01.007
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2024.01.007
  • Receive Date：2023-02-28
  • Online Date：2025-12-22
  • Published：2024-01-20
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  • Received：2023-02-28
  • Revised：2023-04-04
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Affiliations
    1Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment, Electric Power Research Institute of Guangxi Power Grid Co., Ltd., Nanning 530023, China
    2Guangxi Power Grid Co., Ltd., Nanning 530023, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.01.007
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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