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Dust-like metal particles are commonly found inside the cavity of GIS that has been operated for many years. However, there is still no clear conclusion as to whether the metal dust will cause partial discharge (PD) and thereby pose a threat to the GIS insulation. In this study, five measurement techniques including photon counting, optical intensity, UHF, ultrasonic, and pulse current methods were employed to investigate the PD characteristics of metal dust with different particle sizes and unit area concentrations under AC voltage. The adaptability of different measurement methods to the measurement of local discharge signals induced by dust particles was clarified, and the mechanism of discharge voltage reduction for insulating gas caused by dust accumulation was preliminarily examined. The results show that compared to optical methods, UHF, ultrasonic, and pulse current methods show lower sensitivity to PD signals generated by metal dust. The number of photons generated by metal dustincreases with the increase of unit area concentration and electrical field strength, and the amplitude of PD optical intensity signals shows a positive correlation with the particle size of dust. Furthermore, the accumulation of metal dust will to some extent reduce the insulation performance of the gas gap in GIS.
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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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