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After long-term outdoor operation, composite insulators undergo ageing, resulting in a decrease in their anti-pollution performance. Insulation cleaning as a repair measure is an important means to restore its performance. To assess the feasibility of insulation cleaning agents for ageing composite insulators, this paper used the method combining mi-crostructure, group changes, and electrical performance to study the effects of different insulation cleaning agent amounts and thermal ageing duration on their insulation recovery characteristics. The results show that the cleaning agent in slightly wet state can optimize the surface structure of the artificial accelerated ageing composite insulator (operated for 3 years) and improve its hydrophobicity and electrical performance. However, under the action of the cleaning agent in fully wet state, due to prolonged swelling effect, the number of surface cracks on composite insulators increases and their depth deepens, making their hydrophobicity and electrical performance decrease slightly. Under the action of insulation cleaning agent, the severely aged composite insulators after 10 years of operation will expose the internal matrix with lighter ageing, but under the fully wetting state, the pulverization layer will be peel off and the deep cracks will be exposed significantly, indicating that excessive cleaning will increase the operation hidden danger of long-term aged insulators. With the extension of ageing time, the improvement effect of the cleaning agent in slightly wet state on the artificial accelerated aging composite insulator sample weakens, while the cleaning agent in fully wet state will accelerate the loss of the components of composite insulator.
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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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