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In this paper, a test platform for partial discharge characteristics and flashover characteristics of insulation molding parts for power transformer was built, and the distribution laws of partial discharge initial field strength, partial discharge initial discharge quantity, partial discharge extinguishing field strength, and surface flashover field strength of different insulation molding parts were obtained. The results show that the partial discharge initial field strength of insulation molding parts decreases with the increase of electrode spacing. When the electrode spacing increases from 10 mm to 25 mm under parallel components, the partial discharge initial field strength decreases by about 40.6%. The partial discharge initial discharge quantity under different components is 8.51-13.70 pC. Under the parallel component, the partial discharge initial field strength of insulating strip and insulating spacer is 2.55-2.85 kV/mm and 1.43-1.78 kV/mm, respectively. Under the vertical component, the partial discharge initial field strength of insulating strip and insulating spacer is 2.65-3.35 kV/mm and 4.31-5.49 kV/mm, respectively. The surface morphology of different insulation molding parts has a significant impact on their surface flashover characteristics. The denser and larger the surface embossed grooves, the better the effect of hindering the development of surface discharge. On the basis of test sample database, a comprehensive performance evaluation method for insulation molding parts based on entropy weight method is proposed. The weight of different performance indicators, which is determined by using four indicators of discharge characteristics of insulation molding parts, as well as the dispersion degree of apparent density and size deviation, is used to evaluate the comprehensive performance of different insulation parts, and the rationality of this evaluation method is verified.
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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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