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Influence of Cosine Square Wave Voltage Frequency on Breakdown Time of Typical Cable Insulation Defects
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Zhen LIU, Liqiang WEI, Peng ZHANG, Jingang SU, Xiaoyu YI, Zizi ZHANG, Xiaofan GUO
Insulating Materials | 2022, 55(4) : 83 - 88
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Insulating Materials | 2022, 55(4): 83-88
• Insulation Technology •
Influence of Cosine Square Wave Voltage Frequency on Breakdown Time of Typical Cable Insulation Defects
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Zhen LIU, Liqiang WEI, Peng ZHANG, Jingang SU, Xiaoyu YI, Zizi ZHANG, Xiaofan GUO
Affiliations
  • State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, China
Published: 2022-04-20 doi: 10.16790/j.cnki.1009-9239.im.2022.04.012
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In order to study the influence of the cosine square wave voltage frequency on the breakdown time of typical cable insulation defects, we prepared the needle plate electrode flaws and water tree defect models. Breakdown tests were carried out with the cosine square wave voltages of 0.1 Hz, 0.5 Hz, and 1.0 Hz, respectively. The distribution of breakdown time and the moment of breakdown point were counted, the microscopic morphology of the breakdown channel was observed, and the mechanism of the influence of the cosine square wave voltage frequency on the breakdown time of the typical insulation defect of the cable was discussed. The results show that with the increase of the frequency of the cosine square wave voltage, the breakdown time of the typical insulation defect of the cable is significantly reduced, and the dispersion is reduced. The vast majority of breakdowns occur during the voltage polarity change phase, which is the rising or falling edge of the cosine square wave. The increase of the synthetic field strength during the polarity conversion process caused by space charge injection and the increase in the number of polarity conversions per unit time may be the main reasons for the above phenomenon.

cross-linked polyethylene cable  /  water tree  /  cosine square wave  /  breakdown  /  needle plate electrode
Zhen LIU, Liqiang WEI, Peng ZHANG, Jingang SU, Xiaoyu YI, Zizi ZHANG, Xiaofan GUO. Influence of Cosine Square Wave Voltage Frequency on Breakdown Time of Typical Cable Insulation Defects[J]. Insulating Materials, 2022 , 55 (4) : 83 -88 . DOI: 10.16790/j.cnki.1009-9239.im.2022.04.012
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.04.012
  • Receive Date：2021-06-23
  • Online Date：2025-12-22
  • Published：2022-04-20
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  • Received：2021-06-23
  • Revised：2021-10-10
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    State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.04.012
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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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