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In order to study the effect of antioxidant types in transformer oil on the thermal ageing performance of insulating paper, antioxidants T501, T531, and DBP were added to the insulation system composed of naphthenic mineral oil and insulating paper, and the antioxidant mass fraction was 0.4%. The heat ageing test was carried out at 130℃ for 600 h. The moisture and furfural content in the insulating oil, the moisture content and polymerization degree in the insulating paper were determined every 120 h. At the same time, the aged insulating paper was characterized by FTIR, XRD, SEM, and EDS. The results show that the addition of antioxidant T501 and T531 have little effect on the deterioration of insulating paper, and the deterioration of insulating paper in the oil with antioxidant DBP is aggravate in the late ageing stage. Since the antioxidant T531 has a combination of neutralization and hydrolysis, it inhibits the degradation process of cellulose, and the ageing degree of T351 insulating paper is the lightest.
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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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