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Electrochemical Corrosion Properties and Failure Analysis of Water-blocking Buffer Layer in High Voltage Power Cables
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Jiankang ZHENG1, Xiaoting SU1, Geng LI1, Zhanwei LIANG1, Zhichen ZHAI1, Jiamin KONG2, Kai ZHOU2
Insulating Materials | 2022, 55(2) : 91 - 96
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Insulating Materials | 2022, 55(2): 91-96
• Test and Analysis •
Electrochemical Corrosion Properties and Failure Analysis of Water-blocking Buffer Layer in High Voltage Power Cables
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Jiankang ZHENG1, Xiaoting SU1, Geng LI1, Zhanwei LIANG1, Zhichen ZHAI1, Jiamin KONG2, Kai ZHOU2
Affiliations
  • 1State Grid Shaanxi Electric Power Company Limited, Xi'an 710032, China
  • 2College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Published: 2022-02-20 doi: 10.16790/j.cnki.1009-9239.im.2022.02.013
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In order to study the failure mechanism of water-blocking buffer layer in high voltage power cable, especially the electrochemical corrosion characteristics, we analyzed the composition of the white powders from failed cables, and confirmed the production mechanism of different composition in the white powders combining with theoretical analysis and simulation experiments. The moisture absorption characteristics of the buffer layer was tested, and the influence of the water content and current density of the buffer layer on its electrochemical corrosion characteristics was studied. Finally, based on electrochemical impedance spectroscopy, the influence of electrochemical corrosion on the electrical characteristics of the buffer layer was identified, and the evolution rule of the buffer layer from electrochemical corrosion to final ablation was determined. The results show that moisture ingress due to dampness or mechanical damage of the cable sheath causes electrochemical corrosion of the buffer layer and leads to the generation of white powder (consisting of NaHCO3 and Al(OH)3) and results in the final failure of the cable. The corrosion rate is closely related to the current density, while the final corrosion degree mainly depends on the moisture content of the buffer layer.

high voltage power cable  /  water-blocking buffer layer  /  electrochemical corrosion
Jiankang ZHENG, Xiaoting SU, Geng LI, Zhanwei LIANG, Zhichen ZHAI, Jiamin KONG, Kai ZHOU. Electrochemical Corrosion Properties and Failure Analysis of Water-blocking Buffer Layer in High Voltage Power Cables[J]. Insulating Materials, 2022 , 55 (2) : 91 -96 . DOI: 10.16790/j.cnki.1009-9239.im.2022.02.013
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.02.013
  • Receive Date：2021-04-16
  • Online Date：2025-12-22
  • Published：2022-02-20
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  • Received：2021-04-16
  • Revised：2021-06-02
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    1State Grid Shaanxi Electric Power Company Limited, Xi'an 710032, China
    2College of Electrical Engineering, Sichuan University, Chengdu 610065, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.02.013
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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
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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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