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Sheath-core interface is an important part of the internal insulation for composite insulators, and it is closely related to the abnormal running defects and failures of composite insulator. In this paper, an aged 500 kV composite insulator with abnormal heating was systematically investigated. The ageing characteristics of materials in sheath-core interface were studied by a variety of characterization techniques. The results show that the ageing of the sheath at the sheath-core interface is significantly affected by the electric field strength of its location. The silicone rubber sheath with abnormal temperature rise or discharge adheres well to the epoxy glass fiber core, but there are particle defects at the sheath-core interface. The peak strength of Si-O bond of silicone rubber sheath increases gradually from the inside to the outside, and the peak strength of -NO2 produced at 1 650 cm-1 also shows the same trend. These results indicate that the ageing of silicone rubber sheath develops gradually from the inside to the outside, which is contrary to the normal ageing order. The core surface at the interface is already aged and turns to white, and the relative content of epoxy resin in the core material decreases from 17.7% to 11.4%. The X-ray diffraction analysis of the interface particles shows that its main component is aluminum hydroxide (ATH), and it is deduced that the interface particles could be formed due to the aggregation of ATH. This kind of interface particle defect is generated in the manufacturing process of composite insulator, and it is hard to find from appearance.
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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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