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The silicone rubber composite insulators operating in humid and hot areas has the problem of microbial contamination caused by mold adhesion, and the effect of mold as a special biological pollution on the performance of silicone rubber insulators is still unclear. In this paper, the suspended insulator strings were contaminated by mold, and their surface flashover characteristics were analyzed under different pollution levels. The influence of mold contamination on the surface flashover properties of insulator was studied by hydrophobicity analysis, scanning electron microscopy, and infrared spectroscopy. The results show that for the insulators with the same pollution level, when there is mold pollution, the mold would damage the surface structure of silicone rubber compared with insulators without mold pollution, resulting in a significant decrease in the hydrophobicity of silicone rubber, and thus the flashover voltage is reduced significantly. Compared with the control group, the surface flashover voltage can be reduced to 76% of the original level at the lowest. However, under the same pollution level, when the mold concentration reaches 107 pcs/cm2, there is an inflection point for the decrease of surface flashover voltage, and the decline rate slows down and tends to saturation. In summary, the synergistic effect of mold adhesion behavior and natural ageing of silicone rubber makes the mold mycelium form micro holes on the surface of insulator, resulting in the breakage of silicone rubber molecular chain, reducing the flashover voltage of insulator, and affecting the stable operation of silicone rubber insulators.
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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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