Full
Outline
To address the problem of elevated stray current caused by insulation deterioration in running rail sections of urban rail transit, which seriously endangers the safety of the traction power supply system and surrounding underground metallic structures, this paper investigates the dynamic distribution patterns of stray current and corresponding protection methods under such insulation deterioration. First, a high-insulation protection scheme for urban rail line sections is designed, and a stray current mitigation strategy for high-insulation sections is proposed, which includes the installation of unidirectional conducting devices and the definition of high-insulation zones. Then, a multi-train dynamic operation simulation model of the urban rail power supply system is established under section insulation deterioration, taking into account the sectional protection control characteristics of the return system. A unified chain-type system model and a power flow solution are developed accordingly. Finally, based on the parameters of an actual domestic urban rail transit line, simulations are performed to analyze the dynamic distribution of stray current and rail potential along the entire line under section insulation deterioration, and the control effectiveness of sectional protection for both stray current and rail potential is evaluated. The results show that insulation deterioration in a section leads to rail potential clamping and an increase in stray current in that section. By adopting sectional protection, which isolates the return current from outside the section while maintaining high insulation within the section, the stray current amplitude in the section can be significantly suppressed, and the rail potential clamping problem induced by insulation deterioration is effectively resolved. The proposed methods can be applied to stray current protection for critical sections of urban rail lines.
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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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