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In order to study the effect of nano Al2O3 on the DC electrical tree of epoxy resin, epoxy and epoxy/Al2O3 nanocomposites were prepared. The samples were conducted electrical tree test and partial discharge detection by using needle-plane electrode, and the inception, growth, and ageing of DC electrical tree and corresponding partial discharge characteristics were analyzed. The results show that the addition of nano-Al2O3 particles can decrease the initiation probability and growth rate of DC electrical tree in epoxy resin. When the mass fraction of Al2O3 is less than 3%, the higher the content of Al2O3, the stronger the ability to suppress the electrical tree. In addition, the faster the voltage rise rate, the higher the initiation probability of DC tree in epoxy resin. When the voltage applying time is about 1 800 s, the DC electrical tree stops growing, and the electrical trees are all branch trees. Partial discharge is an important reason for DC electrical tree ageing of epoxy resin, and the partial discharge pulse clusters appear in the voltage rise and fall phases in each cycle mainly, which is due to that the electrical trees grow faster at these two phases. By comparing the partial discharge test results of pure epoxy resin and the nanocomposites with 1% Al2O3, it is found that nano-Al2O3 can suppress the partial discharge in the electrical tree developing process, which leads to the decrease of discharge pulse amplitude and appearing of more sparse partial discharge areas, indicating that the nano particles can suppress the development of electrical tree by suppressing partial discharge.
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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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