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Growth Characteristics of Electrical Tree in Laminar Composite Insulation for Wind Turbine Generator Under Repetitive Impulse Voltage
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Zhiqiang DUAN1, Xuezhong LIU2, Yanxia TANG2, Guanfang LIU1, Jingna WANG2, Na HUANG1, 3, Wenbin YU1, 3
Insulating Materials | 2022, 55(6) : 88 - 94
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Insulating Materials | 2022, 55(6): 88-94
• Insulation Technology •
Growth Characteristics of Electrical Tree in Laminar Composite Insulation for Wind Turbine Generator Under Repetitive Impulse Voltage
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Zhiqiang DUAN1, Xuezhong LIU2, Yanxia TANG2, Guanfang LIU1, Jingna WANG2, Na HUANG1, 3, Wenbin YU1, 3
Affiliations
  • 1CRRC YongJi Electric Co., Ltd., Xi'an 710016, China
  • 2State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
  • 3Xi'an Yonge Jieli Wind Energy Co., Ltd., Xi'an 710018, China
Published: 2022-06-20 doi: 10.16790/j.cnki.1009-9239.im.2022.06.016
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Under repetitive impulse voltage, tests of the growth characteristics of electrical tree were conducted on laminar composite insulation consist of impregnating resin and insulating tape for wind turbine generator. The effect of impulse voltage repetitive rates on the electrical tree initiation characteristics, morphological features, and growth curve of the insulation composited by epoxy modified unsaturated polyester resin with polyimide film reinforced mica tape was studied. The growth characteristics of electrical tree extending feature along the interface of insulating tape was analyzed. The results show that under the bipolar square wave impulse voltage with the peak voltage of 7 kV and the repetitive rates of 500 Hz, 1 000 Hz and 2 000 Hz, respectively, the electrical trees in samples are all branch-shaped and the branches are relatively sparse. The electrical tree extends laterally along the interface when it grows to the insulating tape, hindering the radial growth of the electrical tree, increasing the breakdown time of the sample.With the increase of the repetitive rate of the impulse, the initiation time of the electrical tree is shortened, the initiation rate is promoted, the branches increases and its discharge channels becomes thinner, the fractal dimension is almost unchanged, and the average radial growth rate increases.

electrical tree  /  wind turbine generator  /  laminar composite insulation  /  square wave impulse voltage  /  epoxy modified unsaturated polyester
Zhiqiang DUAN, Xuezhong LIU, Yanxia TANG, Guanfang LIU, Jingna WANG, Na HUANG, Wenbin YU. Growth Characteristics of Electrical Tree in Laminar Composite Insulation for Wind Turbine Generator Under Repetitive Impulse Voltage[J]. Insulating Materials, 2022 , 55 (6) : 88 -94 . DOI: 10.16790/j.cnki.1009-9239.im.2022.06.016
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.06.016
  • Receive Date：2021-09-10
  • Online Date：2025-12-23
  • Published：2022-06-20
Article Data
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History
  • Received：2021-09-10
  • Revised：2021-11-16
Funding
Affiliations
    1CRRC YongJi Electric Co., Ltd., Xi'an 710016, China
    2State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
    3Xi'an Yonge Jieli Wind Energy Co., Ltd., Xi'an 710018, China
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Citations
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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