C4F7N/CO2及其分解气体与环氧树脂的相容特性分析

doi:10.19595/j.cnki.1000-6753.tces.240176

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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/CO₂and 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 words： C₄F₇N CO₂ byproducts Bisphenol-A epoxy resin gas-solid compatibility

Received: 26 January 2024

PACS:

TM213

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	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, 0, (): 2492909-2492909.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240176 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/2492909

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