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Partial discharge type is closely related to the early insulation deterioration degree of power capacitor film. The accurate identification of partial discharge type will effectively improve the operation state of capacitor and guarantee the safety of power grid. In this paper, the models of inter-film tip defects, air gap defects, and surface defects generated easily in metallic film capacitor were designed. The time series and phase distribution spectra characteristics of partial discharge in capacitor film and the development of average discharge quantity Q and discharge repetition rate F were analyzed. The curves of Q and F were fitted with points, and the correlation between them and partial discharge signal was analyzed. The correlation coefficient was taken as the characteristic parameter of time domain. The skew, steepness, and asymmetry of partial discharge phase distribution spectra were extracted as phase characteristic parameters. A partial discharge pattern recognition method of power capacitor film based on time-phase synthetic radar spectrum was proposed. The barycentric coordinates of the enclosed rectangle of characteristic parameters closed graph in the synthesis spectrogram were conducted cluster analysis, and the distribution quadrants of barycentric coordinates were used to recognize the partial discharge pattern of film. The results show that the method has more pattern recognition accuracy than the traditional single spectrum, which provides a theoretical basis for online monitoring and fault diagnosis of capacitor equipment.
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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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