波纹护套高压XLPE 电缆缓冲层空气间隙电场分布

Translated title of the contribution: Electric field distribution in air gap between the buffer layer and corrugated metallic sheath of HV XLPE cable

Gen Li*, Hang Wang, Wenjun Zhou, Chengke Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In recent years, a number of failures due to discharge on the buffer layer in HV cable systems were reported. Although the conclusions of the failure mechanisms have been controversial, the distorted electric field between the metallic sheath and the buffer layer was believed to be the main reason. Previously published investigations failed to consider the influence of the geometric parameters of the corrugated sheath on the distorted electric field. A numerical simulation model, considering the impedance of the buffer layer and the sheath geometry of an 110 kV XLPE cable, is established in this paper based on Maxwell equations. The results show that: When the conductivity of the buffer layer is between 10-6~10-9 S/m, the voltage potential is mainly affected by the conductivity. The voltage potential depends on the buffer layer permittivity under the condition that the conductivity is less than 10-9 S/m. The voltage potential is close to 0 in scenarios where the buffer layer conductivity is greater than 10-6 S/m. Distribution of the voltage potential in the air gap becomes corrugated due to the shape of the sheath, resulting in high electric field concentrating near the interface. This finding is consistent with previous reports of the discharge area. The voltage potential of the outer surface of the buffer layer decreases when approaching the material interface because of the corrugation, while the inner surface is not influenced by the sheath. Smaller pitch or larger embossing depth of the metallic sheath results in greater electric field in the air gap. © 2021, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.
Translated title of the contributionElectric field distribution in air gap between the buffer layer and corrugated metallic sheath of HV XLPE cable
Original languageChinese (Simplified)
Pages (from-to)167-175
Number of pages9
JournalGaoya Dianqi/High Voltage Apparatus
Volume57
Issue number10
DOIs
Publication statusPublished - 16 Oct 2021

Keywords

  • Buffer layer
  • Corrugated metallic sheath
  • Electric field simulation
  • High voltage cable

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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