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Metal particles are easily generated during the installation and operation of DC gas-insulated transmission lines (GIL). Under electrodynamic forces, the particles may contact with insulators, causing electric field distortion on the insulator surface, partial discharge, or even insulation breakdown, which seriously threatens the safe operation of GIL equipment. Based on a coupled electric field-flow field mathematical model for DC GIL, combined with the motion trajectories of metal particles inside the DC GIL, the feasibility of an lifting type particle trap as a particle movement suppression scheme was investigated. The results show that after installation of particle trap, the jumping motion of most particles is suppressed. The electric field strength in the bottom area of the trap is significantly reduced, but the degree of electric field distortion increases at the top area of trap, and insulator and high-voltage conductor, indicating that a balance between the electric field shielding range and distortion risk must be considered when designing trap parameters. By optimizing trap parameters such as lifting height, grid width, baffle width, and distribution angle, the low-field-strength coverage area can be expanded, which enhances the electric field shielding effect and particle movement suppression capability of the trap, and reduces the proportion of escaped particles.
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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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