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In order to study the influence of temperature on the nonlinear resistance characteristics of different stress grading materials, a measurement method using the presetting low resistivity tape as the electrode was proposed and applied. The nonlinear volt-ampere characteristics of four stress grading materials under different temperatures were tested. At the same time, the influencing degree of temperature on the nonlinear resistance characteristics of different stress grading materials were studied by function fitting method. The distribution differences of surface electric field along the stress grading structure at stator winding end of 24 kV hydro-generator under the withstand voltage test voltage and the rated phase voltage at different temperatures were further simulated and compared. The results show that the nonlinear volt-ampere characteristics and surface resistivity of four stress grading materials show obvious temperature dependence, with the increase of temperature, both the initial surface resistivity and nonlinear coefficient decrease, there is little difference among the surface electric field distributions along the stress grading structure of 24 kV hydro-generator under different temperatures.
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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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