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In order to investigate the surface discharge process and its microscopic characteristics of glass fiber reinforced epoxy resin composite insulating material, an experimental platform of slant plate electrode was constructed in this paper. Surface tracing and corrosion tests were conducted on samples by a constant tracing voltage method, and the formation mechanism of electric trace was analyzed by combining the Bernoulli equation of ideal liquid. The change of functional groups, surface roughness, and three-dimensional morphology of epoxy resin materials under different stages of tracing corrosion were tested. The results show that the damp and polluted area of insulation composite material is very easy to generate leakage current and discharge, and the most serious corrosion situation always occurs at the bottom electrode firstly. With the increase of tracing corrosion degree on the surface of sample, the epoxy group, hydroxyl group, amino group, aldehyde group in epoxy resin molecular chain gradually decompose, and the carbonyl group decompose not completely after its generation. The surface morphology of the material gradually becomes rough and irregular, the surface roughness shows an upward trend, and the roughness during the explosive period is about 2.8 times bigger than that during the starting period.
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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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