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Influence mechanisms of epoxy/ZnO coating on DC surface flashover performance of epoxy composite in SF6/N2 gases
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Lei ZHANG1, Guobao ZHANG1, Zhengyang WU1, Wei YANG1, Mengyi CAI1, Longfei ZHANG2, Zhen LI2
Insulating Materials | 2025, 58(4) : 99 - 108
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Insulating Materials | 2025, 58(4): 99-108
• Insulation Technology •
Influence mechanisms of epoxy/ZnO coating on DC surface flashover performance of epoxy composite in SF6/N2 gases
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Lei ZHANG1, Guobao ZHANG1, Zhengyang WU1, Wei YANG1, Mengyi CAI1, Longfei ZHANG2, Zhen LI2
Affiliations
  • 1 Electric Power Research Institute, State Grid Anhui Electric Power Company Limited, Hefei 230601, China
  • 2 Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Published: 2025-04-20 doi: 10.16790/j.cnki.1009-9239.im.2025.04.013
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Surface flashover at the gas-solid interface of basin type insulator is the key problem that causes the ultra high voltage GIS/GIL failure, and it is the technical bottlenecks restricting the development of advanced electrical transmission system. In order to improve the DC flashover performance of the basin type insulator in SF6/N2 gas mixture, the zinc oxide (ZnO) nanoparticles with different contents were added to the epoxy resin to obtain epoxy/zinc oxide (EP/ZnO) coatings, and the EP/ZnO coatings were coated on the surface of epoxy material. Then the transport parameters and flashover performance were tested. The results show that EP/ZnO coating increase the shallow trap density and reduce the shallow trap energy level of epoxy composite, and increase the carrier mobility. The electrical conductivity of the epoxy materials coated by EP/ZnO coatings with 15% and 20% ZnO mass fraction show nonlinear characteristics, the existence of the coatings can reduce the electric field distortion and promote the dissipation of surface charge. The EP/ZnO coating can remarkably uniform electric field distribution and effectively inhibit the charge accumulation on the surface of epoxy materials, and improve the DC flashover performance. When the mass fraction of ZnO is 20%, the DC flashover voltage of the epoxy composite increases by 15.42%.

surface flashover  /  epoxy/ZnO coating  /  surface traps  /  surface charge  /  nonlinear conductivity
Lei ZHANG, Guobao ZHANG, Zhengyang WU, Wei YANG, Mengyi CAI, Longfei ZHANG, Zhen LI. Influence mechanisms of epoxy/ZnO coating on DC surface flashover performance of epoxy composite in SF6/N2 gases[J]. Insulating Materials, 2025 , 58 (4) : 99 -108 . DOI: 10.16790/j.cnki.1009-9239.im.2025.04.013
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Year 2025 volume 58 Issue 4
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2025.04.013
  • Receive Date：2024-05-19
  • Online Date：2025-11-07
  • Published：2025-04-20
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  • Received：2024-05-19
  • Revised：2024-07-12
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Affiliations
    1 Electric Power Research Institute, State Grid Anhui Electric Power Company Limited, Hefei 230601, China
    2 Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2025.04.013
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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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