Multi-dimensional functionally graded insulator for HVDC compact gas insulated apparatus. (18th May 2023)

• Record Type: Journal Article
• Authors: Dong, Jianan; Du, Boxue; Liang, Hucheng; Yao, Hang
• Is Part Of: Journal of physics. Volume 56:Number 20(2023)
• Publication Date: 2023-05-18
• Subjects: HVDC -- epoxy insulator -- functionally graded material -- electric field -- flashover voltage; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/acc4d2
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Gas insulated switchgear may be exposed to AC-DC mixed voltages in bipolar high voltage direct current (HVDC) systems. To improve the insulation performance of the epoxy insulator, this paper develops the multi-dimensional functionally graded materials (MFGM), which combines the bulk permittivity graded materials ( ϵ -FGM) and the surface nonlinear conductivity materials (SNCM). The ϵ -FGM bulk and the SNCM layer of the MFGM insulator were prepared by the layer-by-layer pouring method and the air spraying technology. Results show that the electric field strength of the MFGM insulator around the HV triple junction is reduced by over 37% and 39% under AC and DC voltages. Compared with the uniform insulator, the AC and the DC flashover voltages of the MFGM insulator are raised by 17.5% and 27.5%, respectively. The MFGM insulator can adapt to both stationary and transient conditions, and thus has a promising application in HVDC compact gas-insulated apparatuses.