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In order to study the effect of winding preload on thermal ageing characteristics of insulating pads, four groups of insulating pads were conducted accelerated thermal ageing tests at 135℃ after appling 0, 200, 500, and 1 000 N of preload, respectively, and the mechanical properties of insulating pads were tested. At the same time, in order to simulate the mechanical ageing of insulating pad under the influence of winding vibration in the actual working condition, a sinusoidal cyclic mechanical load with 5 N of amplitude and 2 Hz was applied on the accelerated thermal ageing of insulating pad with 200 N of preloading force. The results show that that thermal ageing causes the stress-strain curve of insulating pad gradually shift to the right under 0 N preload, and its elastic modulus decreases gradually. The elastic modulus of insulating pad decreases to 79.935% of the new insulating pad after accelerated ageing for 336 h at 135℃. Applying preloading force can slow down the thermal ageing of insulating pad, and the greater the preloading force, the lower the ageing rate and ageing degree of insulating pad. But applying cyclic mechanical load will accelerate the ageing of insulating pad. The research results have certain reference and practical application value for the research of insulation pad ageing and transformer vibration.
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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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