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In practical operation, GIS mechanical failure is a major cause of accidents. In recent years, the proportion of accidents caused by mechanical failures has gradually increased. However, there are few reports in existing research on the specific process of mechanical failures, how to effectively handle such failures, and how to prevent accidents caused by them. A chain accident caused by a mechanical failure of a GIS equipment isolation switch was introduced. Taking the chain accident of two consecutive trips and two main transformers losing power in sequence caused by mechanical problems of the isolation knife switch in the GIS composite electrical equipment of a 110 kV substation as an example, through the investigation and analysis of the operating mode, protection action, and unpacking inspection results before the GIS fault, the occurrence process of this accident was depicted, and the analysis results of this accident were given. Corresponding rectification suggestions are proposed, providing a typical basis for the production, installation and operation of GIS 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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