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Aiming to address the challenges in composite insulation, low dielectric constant and loss in high-voltage, high-frequency transformers, this paper aims to investigate the dielectric and breakdown characteristics of a novel composite insulation material composed of fluorocarbon (FC-40) and insulation paper. Firstly, the basic physico-chemical properties of the fluorocarbon were studied, and a Nomex paper-fluorocarbon composite insulation sample was prepared by fully vacuum impregnating Nomex paper with the fluorocarbon. The dielectric and breakdown properties of the composite insulation were investigated using a broadband dielectric spectroscopy system under high-temperature and high-pressure and an AC/DC breakdown testing platform, combined with the Havriliak-Negami (H-N) relaxation distribution model. The results indicate that the Nomex paper-fluorocarbon composite insulation exhibits weak interfacial polarization, leading to a negligible increase in the imaginary part of the dielectric constant in the low-frequency range. The high-frequency relaxation peak shifts to higher frequencies as the temperature increases. Both the permittivity and dielectric loss of the Nomex paper-fluorocarbon composite insulation are significantly lower than those of conventional oil-paper insulation. The AC and DC breakdown strengths of the Nomex pa-per-fluorocarbon composite insulation are substantially higher than those of pure fluorocarbon, and are comparable to those of conventional oil-paper composite insulation. Overall, the Nomex paper-fluorocarbon composite insulation exhibits low permittivity, low dielectric loss, excellent breakdown performance, and high stability, making it a promising candidate for applications in the insulation system of high-frequency power electronic devices.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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