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As a key device in ultra-high voltage and extra-high-voltage transmission projects, the deflagrate accidents of bushings seriously threaten the safe and stable operation of the power system. Adhesive impregnated paper bushing is an alternative to oil-impregnated paper bushings with deflagration risks, while there is relatively little research on the thermodynamic behavior of its core insulating material of epoxy resin impregnated paper during arc faults and the risk of bushing deflagration. In this paper, the thermogravimetric experiments and differential scanning calorimetry analysis at different heating rates were conducted on epoxy resin impregnated paper, and its thermal decomposition process was analyzed. Flynn-Wall-Ozawa (FWO) method and Coast-Redfern (CR) method were used to obtain the pyrolysis kinetic models of epoxy resin impregnated paper at high temperature in an oxygen-free environment. The results show that the thermal decomposition process of epoxy resin impregnated paper in adhesive impregnated paper bushing can be divided into three stages: epoxy melting, endothermic reactions, and decomposition gasification, and the first two stages conform to three-dimensional diffusion model, random nucleation and subsequent growth model, respectively. After an arc breakdown fault occurs in bushing cores, the thermal decomposition mass loss of epoxy resin impregnated paper is as high as 90% under the effect of high temperature. The high temperatures and gas expansion produce high amplitude internal stress inside the core, which leads to core cracking and even explosion.
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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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