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To improve the electrical performance of transformer oil under high electric field strength and extreme operating conditions, in this paper, modified transformer oils containing different concentrations of SiO2 and ZnO nanoparticles were prepared, the terahertz time-domain spectra of different oil samples were measured experimentally, and the differences in their terahertz time and frequency domain spectral characteristics were analyzed. The results show that the absorption coefficients of different oil samples exhibit similar variation trends in the lower frequency range of 0.2-1.0 THz, while absorption is enhanced in the higher frequency range of 1.0-2.0 THz, where the differences in absorption characteristics among the oil samples are significant. Compared with pure transformer oil, the refractive index and permittivity of the nano-modified transformer oils in the terahertz frequency range increase significantly. In the frequency range of 0.2-2.0 THz, as the nanoparticle concentration increases, the average dielectric constant of both types of nano-modified transformer oils first increases and then decreases slightly. Meanwhile, the average dielectric loss factor of the ZnO nano-oil exhibits a fluctuating downward trend, whereas that of the SiO2 nano-oil first decreases and then increases.
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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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