【作者】 徐光强；

【导师】 高仕斌； 周健；

【作者基本信息】 西南交通大学 ， 电气工程， 2003， 硕士

【摘要】 近年来，随着我国城市轨道交通事业的蓬勃发展，直流牵引供电系统中杂散电流对主体结构钢筋及其它金属结构的电化学腐蚀问题越来越引起社会的广泛关注。对直流牵引供电系统中杂散电流的特性、分布与防护进行理论与仿真分析，可以总结出杂散电流防护的一般性原则和方法，并可结合工程实际，为杂散电流防护设计、施工及运营提供合理的依据，采取切实可行的防护方案，确保工程长期安全、可靠地运行。 本文讨论了杂散电流产生及对结构钢筋和金属管线的腐蚀机理，对走行轨回流的直流牵引供电系统杂散电流的特性及分布进行了分析和仿真，提出了影响杂散电流的各个参数与杂散电流大小及分布的关系和具体防护措施，并结合大连市快速轨道交通3号线工程进行了杂散电流防护设计和具体实施。第一章，简要介绍了杂散电流研究在城市轨道交通中的重要性及现状。第二章，介绍了杂散电流对金属结构的腐蚀机理，对典型的直流牵引供电系统建立了数学模型，在此基础上进行了理论推导和仿真分析，得出了有无排流网设置、是否排流情况下单边供电方式和双边供电方式中杂散电流的分布规律。第三章，具体分析了供电臂长度、回流走行轨纵向电阻、回流走行轨对地的过渡电阻、机车负荷大小、排流网纵向电阻以及是否排流对城市轨道交通系统杂散电流分布及大小的影响，提出了工程设计中对城市轨道交通系统主体结构钢筋和邻近城市轨道交通的地下金属结构杂散电流防护应采取的各种有效措施。第四章，结合工程实例，介绍了大连市快速轨道交通3号线工程杂散电流防护的仿真分析、具体实施和效果评价。应用实例表明，杂散电流仿真分析为工程实施提供了尽可能合适的设计方案，具有较明显的经济效益和社会效益。更多还原

【Abstract】 With the rapid development of urban mass transit system, more and more attentions are paid to the problem of metal structure corrosion from stray current of DC traction power supply system. Stray current protection method can be developed by carrying out theoretical analysis and digital simulation of stray current. Suitable criteria for stray current protection designing, construction and operation that can insure long-term safety and reliability can also be found by theoretical analysis and digital simulation.In this paper a further discussion of the causes of stray current in DC traction power supply system and the corrosion mechanism of stray current to steel structure and metal pipeline is presented. Based on the digital simulation of DC traction power supply system, the properties and distribution of stray current are discussed in detail. By analyzing the influence of various parameters on stray current, methods to control stray current are proposed. The method proposed has applied in the stray current protection designing in Dalian rapid railway line 3. Chapter one is a brief introduction to the importance and present situation of stray current protection in urban mass transit system. The stray current corrosion mechanism to metal structure is introduced and mathematical model of typical DC traction power supply system is constructed in chapter two, on the basis of theoretical analysis and digital simulation analysis, the characteristics and distribution of stray current are obtained in one-way feeding and two-way feeding power supply system. The impacts of parameters, including length of feeding section, resistance per unit length of running rails, resistance per unit length of running rails/earth, traction load, resistance per unit length of the metallic-conductive interconnected structure and existence of drainage, on stray current are analyzed in detail in chapter three, effective methods of stray current protection in engineering designing are given. In chapter four, simulation analysis, implementation and the evaluation of Dalian rapid railway line 3 are introduced. It is found that the simulation analysis of stray current canprovide a proper design than others, so it holds far more distinctive economic and social benefits.更多还原