作　　者： (于志永）;

机构地区： 青岛地铁集团有限公司,青岛266011

出　　处： 《城市轨道交通研究》 2017年第9期136-139,共4页

摘　　要： 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。 Currently,rail potential is usually too high in urban rail transit. In order to ensure the safety of passengers,rail po- tential limiting device is widely used to suppress the rail po- tential. 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 in- crease of stray current leakage. Therefore,it is necessary to op- timize the rail potential limiting device to reduce the stray cur- rent impact. In this paper,a novel hierarchical rail potential limiting device is proposed,it can not only suppress rail po- tential,but also reduce the stray current leakage effectively.

关 键 词： 城市轨道交通 钢轨电位限制装置 杂散电流 分级控制