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The main negative effect of transformer insulation ageing is the decline of mechanical properties. Once the winding coil is impacted by external short circuit, it will probably produce deformation, which will lead to the loss of insulating ability and eventually cause transformer fault. A mechanical analysis model of insulating paper materials was established according to their structural characteristics on the basis of material mechanics. Combined with the ageing mechanism and influencing factors of insulating paper materials, a test platform for the mechanical properties of insulating paper materials was built. The mechanical properties of insulating paper materials under different ageing degrees were studied to obtain the ageing mechanical properties of insulating paper materials. The results show that the plasticity of the insulating paper material basically disappears under repeated cyclic loading, and the insulating paper under different ageing times can be approximately simplified as an elastic material.
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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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