Influence of Deformed Corrugated Aluminum Sheath on the Electric Field of Extruded Insulation DC Cable

doi:10.11930/j.issn.1004-9649.202004035

Abstract

Abstract: In order to determine the possible damage to the cable insulation structure by deformed corrugated aluminum sheath of HVDC cable and its influence on the electrical performance during operation, thermal expansion test and radial pressure test were conducted on 500 kV DC cable to identify the concave defects on insulation surface caused by the deformation of corrugated aluminum sheath. A finite element model was established to analyze the variation of insulation field intensity distribution with temperature drop, and the field intensity distribution on the defected insulation surface caused by the deformed corrugated aluminum sheath. The finite element simulation results show that the insulation field strength of cable varies with the insulation temperature difference during the load process, and the defects on the insulation surface can further cause the field strength distortion, the extent of which is related to the applied voltage and insulation temperature difference.

Key words: DC cable, XLPE insulation, corrugated aluminum sheath, temperature drop, electric field distribution, finite element analysis

ZHANG Hongliang, YIN Yi, XIAO Jinyu, HOU Jinming, YAN Zhiyu, XIE Shuhong, HU Ming. Influence of Deformed Corrugated Aluminum Sheath on the Electric Field of Extruded Insulation DC Cable[J]. Electric Power, 2020, 53(9): 141-149.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004035

https://www.electricpower.com.cn/EN/Y2020/V53/I9/141

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