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The ultra-high frequency (UHF) method for detecting partial discharge (PD) is currently one of the important means to evaluate the state and insulation performance of gas insulated switchgear (GIS). In this paper, in order to solve the problem of a large number of missing and false alarms in UHF detection of GIS partial discharge, GIS insulator with metal foreign object attached on the surface was conducted long-term constant voltage experiments. The successful capture probability of discharge signal was analyzed by combining with the existing UHF detection strategies, and optimization schemes of the existing UHF signal detection strategies were proposed from detection time and detection threshold. The results show that the partial discharge of metal foreign object defect attached on the insulator surface has intermittent characteristics, and the existing UHF live detection and online monitoring strategies have low detection probability of discharge. The capture probability of effective discharge can reach 85% by extengding the detection time to 2 247 seconds in optimization of live detection strategy. The detection probability of PD Event can increase by extengding the measurement time of forming a partial discharge event (PD Event) and reducing detection threshold in optimization of online monitoring strategy. In engineering application, the combination of appropriate measurement time and detection threshold can be selected to detect the intermittent discharge.
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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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