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Research on Influence of Insulating Sheath on AC Breakdown Characteristics of Gap
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Huibin LIU1, Yanwei WANG1, Bo LI1, Yongkun ZHU2, Shenghui WANG3, Wenwen ZHANG3, Fangcheng LÜ3
Insulating Materials | 2021, 54(10) : 84 - 88
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Insulating Materials | 2021, 54(10): 84-88
• Insulation Technology •
Research on Influence of Insulating Sheath on AC Breakdown Characteristics of Gap
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Huibin LIU1, Yanwei WANG1, Bo LI1, Yongkun ZHU2, Shenghui WANG3, Wenwen ZHANG3, Fangcheng LÜ3
Affiliations
  • 1State Grid Inner Mongolia Eastern Electric Power Co., Ltd. Electric Power Research Institute, Hohhot 010000, China
  • 2State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010000, China
  • 3North China Electric Power University, Beijing 102206, China
Published: 2021-10-20 doi: 10.16790/j.cnki.1009-9239.im.2021.10.013
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Covering insulating sheath on transmission lines is one of the commonly measures to prevent bird damage in engineering, and the breakdown voltage of the air gap between bird droppings and the surface of sheath directly affects the configuration scheme of sheath. In this paper, the variation characteristics of breakdown voltage with the thickness of sheath and the influence of sheath defect on the breakdown voltage under different air gap distance were investigated by experiment, in which the bird droppings were simulated by copper rod. The results show that compared with bare wires, the breakdown voltage of the gap in the wires covered sheath with the thickness of 2.0, 3.0, 3.5 mm increases by 17.7%, 33.1%, 41.6%, respectively. Compared with new sheath of the same thickness, the breakdown voltage of gap in the defective sheath with the thicknesses of 2.0, 3.0, 3.5 mm decreases by 70.6%, 62.8%, 44.2%, respectively. It is concluded that the smaller the thickness of the defective sheath, the larger the decreasing amplitude of breakdown voltage.

insulating sheath  /  thickness  /  breakdown point  /  gap breakdown voltage
Huibin LIU, Yanwei WANG, Bo LI, Yongkun ZHU, Shenghui WANG, Wenwen ZHANG, Fangcheng LÜ. Research on Influence of Insulating Sheath on AC Breakdown Characteristics of Gap[J]. Insulating Materials, 2021 , 54 (10) : 84 -88 . DOI: 10.16790/j.cnki.1009-9239.im.2021.10.013
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.10.013
  • Receive Date：2021-01-08
  • Online Date：2026-03-23
  • Published：2021-10-20
Article Data
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History
  • Received：2021-01-08
  • Revised：2021-02-26
Affiliations
    1State Grid Inner Mongolia Eastern Electric Power Co., Ltd. Electric Power Research Institute, Hohhot 010000, China
    2State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010000, China
    3North China Electric Power University, Beijing 102206, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2021.10.013
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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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