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Effect of Pre-crosslinking on Space Charge Characteristics of XLPE DC Cable Materials
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Yuanxiang ZHOU1, 2, You WU1, Ling ZHANG2, Yunxiao ZHANG2, Xin HUANG2, Chenyuan TENG2
Insulating Materials | 2022, 55(3) : 23 - 31
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Insulating Materials | 2022, 55(3): 23-31
• Material Research •
Effect of Pre-crosslinking on Space Charge Characteristics of XLPE DC Cable Materials
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Yuanxiang ZHOU1, 2, You WU1, Ling ZHANG2, Yunxiao ZHANG2, Xin HUANG2, Chenyuan TENG2
Affiliations
  • 1The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment, School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
  • 2State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Published: 2022-03-20 doi: 10.16790/j.cnki.1009-9239.im.2022.03.003
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In the extrusion process of XLPE cable materials, when the local extrusion temperature is higher than the decomposition temperature of crosslinking agent, the crosslinking agent will be thermally decomposed in advance, resulting in a low degree of pre-crosslinking in materials. To study the effect of pre-crosslinking on the space charge characteristics of XLPE DC cable materials, the low-degree pre-crosslinking treatment at different temperatures (140℃, 150℃, and 160℃) was carried out before high-temperature crosslinking of XLPE DC cable materials. The aggregated structure was characterized by X-ray diffraction, differential scanning calorimetry, and crosslinking test, and the space charge characteristics at different temperatures were studied. The results show that pre-crosslinking will hinder the normal crosslinking process of XLPE at high temperature, which leads to the decrease of crosslinking degree and crystallinity. Incomplete crosslinking structure makes the pre-crosslinked XLPE samples accumulate a lot of the same polarity of charges injected by electrodes. At the same time, more impurity molecules remaining in the sample will dissociate with the increase of temperature to produce large number of the different polarity of charges, which leads to serious electric field distortion. The decrease of crystallinity also leads to the increase of trap density and depth at the interface between the crystal region and the amorphous region, which limits the charge migration and detrapping process.

XLPE cable  /  pre-crosslinking  /  aggregation structure  /  space charge  /  electric field distortion
Yuanxiang ZHOU, You WU, Ling ZHANG, Yunxiao ZHANG, Xin HUANG, Chenyuan TENG. Effect of Pre-crosslinking on Space Charge Characteristics of XLPE DC Cable Materials[J]. Insulating Materials, 2022 , 55 (3) : 23 -31 . DOI: 10.16790/j.cnki.1009-9239.im.2022.03.003
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doi: 10.16790/j.cnki.1009-9239.im.2022.03.003
  • Receive Date：2021-03-15
  • Online Date：2025-12-22
  • Published：2022-03-20
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History
  • Received：2021-03-15
  • Revised：2021-04-10
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Affiliations
    1The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment, School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
    2State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.03.003
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
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Number of
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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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