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Infrared temperature rise detection is an effective means to screen faulty composite insulators. However, the causes of abnormal heating of composite insulators are diverse, and not all causes will evolve into malignant faults. Therefore, it is particularly important to distinguish the abnormal heating caused by different causes for the safe, stable, and economic operation of power grid. In this paper, the physical and chemical properties of two 220 kV retreated composite insulators with different heating characteristics were studied by SEM and FTIR, and their dielectric properties were also studied. The results show that the causes of different abnormal temperature rise are different. For the composite insulator whose heating part is concentrated at the end of high-voltage end and temperature rise is lower than 5℃, the epoxy resin of the core rod at the heating part has no obvious degradation, and the dielectric constant and dielectric loss factor have no obvious increase, while the sheath has holes and shallow microcracks, and the dielectric constant and dielectric loss factor increase with the increase of humidity. For the composite insulator whose heating part extends to multiple umbrella skirts and temperature rise is up to 40 ℃, the epoxy resin of the core rod has obvious degradation, and the dielectric constant and dielectric loss factor are 3.67 times and 79.4 times bigger than those of the normal part, respectively.
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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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