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Insulating Property Change and Partial Discharge Characteristics of Polypropylene Laminated Paper After Electrical Ageing
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Xin ZHAO, Tao HAN, Yufei YAO, Zhonglei LI
Insulating Materials | 2021, 54(12) : 58 - 63
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Insulating Materials | 2021, 54(12): 58-63
• Insulation Technology •
Insulating Property Change and Partial Discharge Characteristics of Polypropylene Laminated Paper After Electrical Ageing
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Xin ZHAO, Tao HAN, Yufei YAO, Zhonglei LI
Affiliations
  • School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Published: 2021-12-20 doi: 10.16790/j.cnki.1009-9239.im.2021.12.010
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Polypropylene laminated paper (PPLP) used in DC superconducting cable is in a wrap-around structure. Due to the existence of rectifier, PPLP withstands AC-DC composite voltage, and it is easy to generate partial discharge at the butt gap. Under long-term working voltage, the insulating property of PPLP changes and affects partial discharge. In this paper, the DC electrical ageing experiment was conducted on PPLP in liquid nitrogen, and the butt gap was simulated by internal discharge model. The electric field distribution of internal discharge model was obtained by simulation calculation, and the electrical ageing mechanism and partial discharge results were discussed and analyzed. The results show that with the increase of ageing time, the electrical conductivity and relative permittivity of PPLP show an increasing overall trend; the DC electric strength of PPLP decreases gradually, but still maintained good insulation properties; the intensity of partial discharge increases the partial discharge phase mainly concentrates in the rising stage of composite voltage, and the ratio between AC and DC of composite voltage is the main factor affecting partial discharge.

polypropylene laminated paper  /  electrical ageing  /  insulating property  /  partial discharge  /  AC-DC composite voltage
Xin ZHAO, Tao HAN, Yufei YAO, Zhonglei LI. Insulating Property Change and Partial Discharge Characteristics of Polypropylene Laminated Paper After Electrical Ageing[J]. Insulating Materials, 2021 , 54 (12) : 58 -63 . DOI: 10.16790/j.cnki.1009-9239.im.2021.12.010
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Year 2021 volume 54 Issue 12
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.12.010
  • Receive Date：2021-02-19
  • Online Date：2026-03-23
  • Published：2021-12-20
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  • Received：2021-02-19
  • Revised：2021-05-07
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    School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
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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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