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In view of the frequent occurrence of omissions and false alarms of partial discharge insulation defects in on-site gas insulated switchgear（GIS），the partial discharge multi-source detection test platform was built by using true GIS to carry out the intermittent discharge test of metal contamination defect on the surface of insulator. Different partial discharge detection methods were used to study the variation of intermittent discharge characteristics of different discharge degrees. The research results show that the discharge amount of metal contamination defect shows a trend of first increasing and then decreases with the prolongation of discharge time；the overall discharge time interval shows an increasing trend；ultrasonic detection method and chemical detection method cannot realize the effective perception of intermittent discharge of metal contamination defect；the distribution law of intermittent discharge can be preliminarily obtained from the 200 frequency period ultra high frequency（UHF）phase-resolved partial discharge（PRPD）spectrum composed of 4 groups of 50 frequency period UHF PRPD spectrum data；metal contamination defect in intermittent discharge state will not gradually evolve into breakdown discharge failures. The research results are of great significance for expanding the cognition of intermittent discharge characteristics and the field detection of GIS discharge defects.
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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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