Impact of Air Gap Defects on the Electrical and Mechanical Properties of a 320 kV Direct Current Gas Insulated Transmission Line Spacer

Yuan Deng, Xianhao Fan (), Hanhua Luo, Yao Wang, Keyan Wu, Fangwei Liang () and Chuanyang Li ()
Additional contact information
Yuan Deng: Department of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Xianhao Fan: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Hanhua Luo: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Yao Wang: Tai’an Taishan High Voltage Switchgear Co., Ltd., Tai’an 271000, China
Keyan Wu: Tai’an Taishan High Voltage Switchgear Co., Ltd., Tai’an 271000, China
Fangwei Liang: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Chuanyang Li: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Energies, 2023, vol. 16, issue 10, 1-14

Abstract: Air gap defects inside a spacer reduce its insulation performance, resulting in stress concentration, partial discharge, and even flashover. If such gap defects are located at the interface between the insulation and conductor, a decrease in mechanical stress may occur. In this work, a finite element method-based simulation model is developed to analyze the influence of gap defects on the electrical and mechanical properties of a ±320 kV direct current gas insulated line (DC GIL) spacer. Present findings reveal that a radially distributed air gap produces a more significant effect on the electric field distribution, and an electric field strength 1.7 times greater than that of the maximum surface value is observed at the air gap. The axial distribution dominates the distortion of the surface stress by generating a stress concentration region in which the maximum stress of the air gap is twice the pressure in the surrounding area.

Keywords: gas insulated line; insulation spacer; finite element method; air gap defect; simulation analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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