地铁绝缘锚段柔性接触网热损伤机理及治理措施
张海波杨立新
Thermal Damage Mechanism and Treatment Measures for Flexible Catenary in Subway Insulated Anchor Section
ZHANG HaiboYANG Lixin
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作者信息:中国铁路设计集团有限公司， 300308， 天津
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Affiliation:China Railway Design Group Co., Ltd., 300308, Tianjin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20241513
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中图分类号/CLCN:U231.8
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栏目/Col:供电与能源
摘要:
［目的］地铁列车在柔性接触网绝缘锚段区域停车时，受电弓可能通过碳板将2个相互绝缘的锚段导通，导致大电流持续通过接触线，引发局部过热和损伤，威胁地铁安全运营, 因此，需揭示绝缘锚段区域热损伤机理并提出治理措施。［方法］通过分析列车停车时的电流流通路径及热损伤形成机理，建立接触网损伤判据，评估不同工况下的热损伤风险。针对电流集中导致的局部过热问题，提出设置分流支路的治理方案，优化支路数量及配置位置以分散电流并降低接触线热负荷。结合仿真模拟，验证分流支路布置方案的可行性。［结果及结论］受电弓导通绝缘锚段会导致电流集中，引发接触线局部过热和损伤。通过设置分流支路并优化其数量与位置，可显著降低接触线热负荷，缓解热损伤问题。计算结果表明，合理布置分流支路可将接触线温度控制在安全范围内，显著提升接触网运行可靠性。
Abstracts:
［Objective］ When a subway train stops in the insulated anchor sections of the flexible catenary, the pantograph may bridge two mutually insulated sections through the carbon strip, causing continuous high current flow through the contact wire. This will lead to localized overheating and damage, threatening the safe operation of subway. Therefore, it is necessary to reveal the thermal damage mechanism in the insulated anchor section and propose treatment measures. ［Method］ By analyzing the current flow path and the formation mechanism of thermal damage during train stop, a catenary damage criterion is established to evaluate the thermal damage risk under different working conditions. To address the localized overheating caused by current concentration, a treatment solution involving the installation of current diversion branches is proposed. By optimizing the number and configuration position of these branches, the current can be dispersed, reducing the thermal load on the contact wire. Combined with simulation, the feasibility of the proposed diversion branches arrangement is verified. ［Result & Conclusion］ The connection of insulated anchor sections by the pantograph leads to current concentration, resulting in localized overheating and damage to the contact wire. By setting diversion branches and optimizing their quantity and position, the thermal load on the contact wire can be significantly reduced, mitigating thermal damage issues. Calculation results demonstrate that a reasonable arrangement of diversion branches can control the contact wire temperature within a safe range, significantly improving the operational reliability of the catenary.
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