轨道交通系统中杂散电流控制技术

摘要

In DC rail transit systems,the running rails are usually used as the return conductor for traction current,Insulation is not completely between running rails and earth,it allows a part of current to leak into earth,then forming stray current.Taking into account the stray currents create or accelerate the electrolytic corrosion of metallic structures located in the proximity of the transit system.This causes metal pipes,cables and earthing grids laid in the ground near the tracks have a much shorter life. So,it is important that stray current is controlled.Reviewing of the control of the stray current that had been studied largely,including the principle of stray current corrosion,as well as stray current control methods.On this basis,stray current control method was introduced,and arrived at the fundamental measures to control stray current.%　　在直流轨道交通系统中，走行轨作为回流轨，又由于走行轨与大地之间的绝缘并不完全，使得部分电流流到大地，从而形成了杂散电流。考虑到杂散电流会使金属结构发生电解腐蚀，铁路附近及地下的金属管线、电缆和接地网的寿命减少。所以对杂散电流控制是十分必要的。回顾了前人对杂散电流控制进行的大量研究，包括杂散电流的腐蚀机理、防护措施等。基于此，提出了解决杂散电流腐蚀问题的方法，从而得出控制杂散电流根本措施。