Transactions of China Electrotechnical Society  2025, Vol. 40 Issue (3): 890-899    DOI: 10.19595/j.cnki.1000-6753.tces.240176
Current Issue| Next Issue| Archive| Adv Search |
Compatibility Analysis of C4F7N/CO2 and Its Gas Byproducts with Epoxy Resin
Duan Junran1,2, Yan Xianglian3, Gao Keli3, Liu Wei4, Qin Minghui5, Han Dong1,2, Zhang Guoqiang1,2
1. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China;
3. China Electric Power Research Institute Beijing 100192 China;
4. Anhui Electric Power Research Institute of SGCC Hefei 230022 China;
5. CSG Smart Grid Electrical Technology Co. Ltd Hefei 230080 China

Download: PDF (2455 KB)   HTML (1 KB) 
Export: BibTeX | EndNote (RIS)      
Abstract  As a potential SF6 alternative, perfluoroisobutyronitrile (C4F7N) mixed gas-insulated electrical equipment is currently in the research and small-scale application stage. The compatibility of gas-solid materials is essential for long-term operation of gas-insulated electrical equipment. Taking Helium gas as the control group, this paper conducts thermal acceleration tests to assess the compatibility of bisphenol-A epoxy resin under C4F7N/CO2 and its gas byproduct atmospheres to provide a reference for the application of C4F7N mixed gas in environmentally friendly gas-insulated electrical equipment.
Three atmospheres are established: Helium, C4F7N/CO2 mixture, C4F7N/CO2 and its gas byproducts. Herein, the C4F7N/CO2 and its gas byproducts are generated through repetitive 50 Hz AC breakdown discharge tests. Bisphenol-A epoxy resin is shaped into column and sheet samples. Compatibility thermal acceleration tests are conducted at 70℃ and 100℃ for 28 days in a high- low-temperature test chamber. The compatibility characteristics are evaluated from gas composition, solid surface morphology, solid surface chemical properties, and glass transition temperature using a gas chromatography-mass spectrometer (GC-MS), scanning electron microscope (SEM)/energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FIRT), and differential scanning calorimeter, respectively. According to the interface zone theory between doped particles α-Al2O3 and epoxy resin matrix, variations in the electrical properties of epoxy resin samples are analyzed.
GC-MS results show no new gases are generated in the atmospheres of C4F7N/CO2 mixture and C4F7N/CO2 and its gas byproducts. However, due to the adsorption of α-Al2O3 particles filled in epoxy resin samples, the content of CNCN in the C4F7N/CO2 and its gas byproduct atmosphere is significantly decreased. According to SEM/EDS detection, epoxy resin samples’ surface has slight corrosion under the C4F7N/CO2 and its gas byproduct atmosphere. During thermal acceleration tests, α-Al2O3 particles and agglomerates precipitate onto the surface and exhibit a loose state, resulting in a decrease in bonding degree between α-Al2O3 particles and the epoxy resin matrix. According to FTIR detection, there is no significant change in the surface elements of the epoxy resin samples. α-Al2O3 characteristic absorption peaks strengthen, while some epoxy resin distinct absorption peaks decrease. The glass transition temperature of the epoxy resin increases after compatibility thermal acceleration tests. The effects of C4F7N/CO2 and its gas byproducts on the surface resistivity, volume resistivity, and flashover voltage of epoxy resin samples are minor. In conclusion, C4F7N/CO2 and its gas byproducts are compatible with Bisphenol-A epoxy resin materials, and the gas-solid compatibility can meet the requirements for normal operation of gas-insulated electrical equipment.
Key wordsC4F7N      CO2      byproducts      bisphenol-A epoxy resin      gas-solid compatibility     
Received: 26 January 2024     
PACS: TM213  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Duan Junran
Yan Xianglian
Gao Keli
Liu Wei
Qin Minghui
Han Dong
Zhang Guoqiang
Cite this article:   
Duan Junran,Yan Xianglian,Gao Keli等. Compatibility Analysis of C4F7N/CO2 and Its Gas Byproducts with Epoxy Resin[J]. Transactions of China Electrotechnical Society, 2025, 40(3): 890-899.
URL:  
https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240176     OR     https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I3/890
Copyright © Transactions of China Electrotechnical Society
Supported by: Beijing Magtech