Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor

Yuze JIANG (姜雨泽); Qiying LI (李其莹); Xuekai ZHANG (张学凯); Diwen JIANG (姜迪文); Shiqiang LIU (刘士强); Bangfa PENG (彭邦发); Jie LI (李杰)

doi:10.1088/2058-6272/abd5a1

Plasma Science and Technology > 2021 > 23(2): 25505-025505. > DOI: 10.1088/2058-6272/abd5a1

Yuze JIANG (姜雨泽), Qiying LI (李其莹), Xuekai ZHANG (张学凯), Diwen JIANG (姜迪文), Shiqiang LIU (刘士强), Bangfa PENG (彭邦发), Jie LI (李杰). Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor[J]. Plasma Science and Technology, 2021, 23(2): 25505-025505. DOI: 10.1088/2058-6272/abd5a1

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Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor

¹ State Grid Shandong Electric Power Research Institute, Jinan 250003, People's Republic of China
² State Grid Shandong Electric Power Company, Jinan 250001, People's Republic of China
³ State Grid Jinan Jiyang Power Supply Company, Jiyang 251400, People's Republic of China
⁴ School of Electrical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China

Funds: This work is supported by State Grid Shandong Electric Power Company (52062618001M).

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Received Date: August 06, 2020
Revised Date: December 11, 2020
Accepted Date: December 20, 2020

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Abstract

Abstract

Corona discharge suppression for high-voltage direct-current (HVDC) transmission lines at line terminals such as converter stations is a subject that requires attention. In this paper, a method based on a conductor covered with dielectric film is proposed and implemented through a bench-scale setup. Compared with the bare conductor, the corona discharge suppression effect of the dielectric-film-covered conductor under positive polarity is studied from the composite field strength and ion current density using a line-plate experimental device. The influences of film thickness and film material on the corona discharge suppression effect are investigated. The charge accumulation and dissipation characteristics of different film materials are also studied. The results show that the conductor covered with dielectric film has excellent ability to inhibit corona discharge. The ground-level composite field strength of the conductor covered with dielectric film is lower than its nominal field strength, and its ion current density is at the nA m⁻² level. The corona threshold voltage can be promoted by increasing the film thickness, but the ability to inhibit corona discharge becomes weak. The larger the surface electric field strength, the more charge accumulated, but the faster the charge dissipation rate. Compared with polyvinyl chloride film, cross-linked polyethylene film has stronger charge accumulation ability and slower charge dissipation rate, which can better restrain the corona discharge of HVDC transmission lines.

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Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor