摘要
在设计或者建设轨道交通时,杂散电流的监测是目前各个项目考虑的重点。模拟轨道交通运营时的闭环电路结构,简化电路图,通过数学建模的方法给出了杂散电流的分布与大小公式,得出杂散电流的大小与走行轨电阻、轨地过渡电阻和回路长度密切相关。根据各因素的影响分析结果,提出了排除或减少杂散电流的基本方法:设立变电所以减少回路长度;增加走行轨与地面的绝缘系统;在管道外壁包裹绝缘材料;铺设排流管网和单设电流回流轨等。其中单设回流轨基本上可以杜绝杂散电流的产生,从而最大限度地保护燃气管线不受轨道交通杂散电流的影响。
In the design or construction of subway,the monitoring of stray current is the focus of various projects at present.By simulating the closed-loop circuit structure of subway operation,the circuit diagram is simplified,and the distribution and size formula of stray current are given by mathematical modeling.The size of stray current is closely related to rail resistance,rail-ground transition resistance and circuit length.According to the analysis results of various factors,the basic methods of eliminating or reducing stray current are put forward,including setting up transformer to reduce circuit length,increasing the insulation system of rail and ground,wrapping insulation material on the outer wall of pipeline,laying drainage pipe network and single current return rail,etc.The single return rail can basically prevent the generation of stray current,so as to maximize the protection of gas pipeline from the influence of stray current of rail transit.
作者
沈威
安成名
孟伟
杨光
SHEN Wei;AN Chengming;MENG Wei;YANG Guang(Shenzhen Gas Co.Ltd.)
出处
《上海煤气》
2021年第6期5-8,共4页
Shanghai Gas
关键词
轨道交通
杂散电流
天然气管道
数学建模
rail transit
stray current
natural gas pipeline
mathematical modeling
