分级式钢轨电位限制装置的研究

目前,国内城市轨道交通针对钢轨电位过高的问题,多采用钢轨电位限制装置来抑制钢轨电位。当钢轨电位超过规定值时,钢轨电位限制装置会动作,将钢轨与大地直接短接。但这一保护动作造成杂散电流的泄露量明显增加。为此提出了一种新型的分级式钢轨电位限制装置。该装置在钢轨与大地之间增设了大功率小阻值电阻,不仅可抑制钢轨电位,还能有效减少杂散电流的泄漏。

Research on Hierarchical Rail Potential Limiting Device

Currently,rail potential is usually too high in urban rail transit.In order to ensure the safety of passengers,rail potential limiting device is widely used to suppress the rail potential.When rail potential exceeds a predetermined value,the rail potential limiting device will be activated,which directly connects the rail with earth but often results in significant increase of stray current leakage.Therefore,it is necessary to optimize the rail potential limiting device to reduce the stray current impact.In this paper,a novel hierarchical rail potential limiting device is proposed,it can not only suppress rail potential,but also reduce the stray current leakage effectively.