Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C4F7N/CO2 gas mixture for eco‐friendly gas insulating transformer
Song Xiao,
Yifan Wang,
Chenhua Ren,
Haoran Xia,
Yue Zhao,
Jingzi Qin,
Xiaoxing Zhang,
Yi Luo,
Yi Li
Affiliations
Song Xiao
State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan Hubei China
Yifan Wang
State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan Hubei China
Chenhua Ren
Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical Engineering Chinese Academy of Sciences Beijing China
Haoran Xia
State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan Hubei China
Yue Zhao
State Grid Anhui Electric Power Company Anhui Electric Power Research Institute Hefei Anhui China
Jingzi Qin
Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment School of Electrical and Electronic Engineering Hubei University of Technology Wuhan Hubei China
Xiaoxing Zhang
Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment School of Electrical and Electronic Engineering Hubei University of Technology Wuhan Hubei China
Yi Luo
Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical Engineering Chinese Academy of Sciences Beijing China
Yi Li
State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan Hubei China
Abstract The eco‐friendly insulating gas perfluoroisobutyronitrile (C4F7N) is potentially used in gas‐insulated transformers (GIT) to replace sulphur hexafluoride (SF6). However, evaluation of the long‐term insulation reliability and gas–solid interface discharge decomposition characteristics of the gas–solid film insulation structure in GIT is indispensable. The authors simulated the gas–solid film insulation structure in GIT and explored the interface partial discharge (PD) characteristics of C4F7N/CO2 gas mixture with polyethylene terephthalate (PET). The effect of gas pressure, mixing ratio on gas–solid interface gas decomposition, PET degradation was investigated, and the interaction mechanism was analysed. It is found that the interface PD generated three degradation regions on a PET film. The gas–solid interface reaction in the electrode contact region and the discharge development trace was significantly higher than that of halation region. The content of gas decomposition products decreases with the increase of gas pressure and the PD intensity of SF6‐PET is inferior to that of C4F7N/CO2 under the same condition. Relevant results provide reference for the development and application of C4F7N/CO2 based GIT.
