Review of Surface Charge Accumulation on Insulators in DC Gas-Insulated Power Transmission Lines: Measurement and Suppression Measures

Fangwei Liang, Hanhua Luo, Xianhao Fan (), Xuetong Li and Xu Wang
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Fangwei Liang: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Hanhua Luo: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Xianhao Fan: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Xuetong Li: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Xu Wang: School of Mechanical Electronic & Information Engineering, China University of Mining & Technology, Beijing 100084, China

Energies, 2023, vol. 16, issue 16, 1-18

Abstract: Gas-insulated power transmission lines (GILs) can replace cables and overhead transmission lines, playing an important role in DC transmission systems. However, the influence of surface charge accumulation on insulation reliability cannot be ignored as the operational voltage of the DC GIL increases. In this paper, the measurement methods for the insulator surface potential are summarized, including, dust maps, the Pockels effect method, and the electrostatic probe method. Then, a typical surface charge inversion algorithm is introduced. The main influencing factors of surface charge accumulation are analyzed, such as the applied voltage, insulation gas, insulator shape, and temperature. The charge accumulation pathway is revealed. Furthermore, methods for inhibiting the accumulation of surface charges and promoting the dissipation of accumulated charges are introduced to reduce the surface charges on insulators. Finally, the development direction of DC GIL insulators is predicted. We anticipate that the online monitoring of surface charge distribution, clarifying the percentage of charge accumulation pathways, and optimizing the insulator casting process will be the research directions for the insulator surface charge topic in the future. This article provides a comprehensive understanding of the surface charges of GIL insulators and a reference for the insulation design of DC GILs.

Keywords: gas-insulated power transmission line (GIL); surface potential measurement; surface charge inversion algorithm; surface charge accumulation mechanism; surface charge suppression measure (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
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