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Cellulose insulation paper affects the reliability of transformer operation due to the long-term action of temperature and electric fields. The existing research mainly focuses on the modification effect of nano-particles on insulation paper under a single physical field, while the modification research under the combined effect of electric-thermal ageing is not yet perfect. This research prepared cellulose insulation papers modified by nano-TiO2 particle with mass fractions of 0, 1%, 3%, 5%, and 7%, and established corresponding molecular models based on molecular dynamics simulation. Combined with macroscopic electric-thermal combined ageing tests, the influence of electric field and temperature field on the electrical properties of modified cellulose insulation papers was studied, and the optimal modification content of nano-TiO2 was explored. The results show that the electrical properties of cellulose insulation paper are mainly affected by temperature, and the introduction of electric field accelerates the ageing of cellulose. After adding nano-TiO2 particles, the number of hydrogen bonds in the cellulose molecular model increases, the relative dielectric constant of the modified cellulose insulation paper decreases, and the electric strength increases. There is a threshold for the improvement of cellulose modification effect by the content of nano-TiO2, and the best modification effect on cellulose samples is achieved when the mass fraction of nano-TiO2 is 5%.
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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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