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DC breakdown characteristics of LDPE in vegetable insulating oil and mineral insulating oil
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Litong ZHANG, Xiaolei ZHAO, Mingtao HU, Yi YIN, Gang ZHAO
Insulating Materials | 2024, 57(2) : 92 - 99
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Insulating Materials | 2024, 57(2): 92-99
• Test and Analysis •
DC breakdown characteristics of LDPE in vegetable insulating oil and mineral insulating oil
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Litong ZHANG, Xiaolei ZHAO, Mingtao HU, Yi YIN, Gang ZHAO
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  • School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Published: 2024-02-20 doi: 10.16790/j.cnki.1009-9239.im.2024.02.013
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With the large-scale construction of UHV long-distance power transmission, vegetable insulating oil instead of mineral insulating oil may become the future development trend. In order to analyze the differences and reasons of DC breakdown characteristics of LDPE (low density Polyethylene) under different environments, the DC breakdown experiments of LDPE were conducted in vegetable insulating oil and mineral insulating oil, and the impacts of insulating oil discharge process on the breakdown of LDPE samples were analyzed through simulation. The results show that the electric strength of LDPE in vegetable insulating oil is significantly higher than that in mineral insulating oil. The surface flashover characteristics and breakdown points of the two insulating oils are also different. The field intensity generated by discharge of vegetable insulating oil is small, so the breakdown field of LDPE in vegetable insulating oil is higher. The difference of discharge process of insulating oil is also the reason for the difference of flashover characteristics and breakdown point.

DC breakdown  /  discharge process  /  LDPE  /  insulating oil
Litong ZHANG, Xiaolei ZHAO, Mingtao HU, Yi YIN, Gang ZHAO. DC breakdown characteristics of LDPE in vegetable insulating oil and mineral insulating oil[J]. Insulating Materials, 2024 , 57 (2) : 92 -99 . DOI: 10.16790/j.cnki.1009-9239.im.2024.02.013
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doi: 10.16790/j.cnki.1009-9239.im.2024.02.013
  • Receive Date：2022-12-09
  • Online Date：2025-12-22
  • Published：2024-02-20
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  • Received：2022-12-09
  • Revised：2023-01-07
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    School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.02.013
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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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