Abstract: At present, the vast majority of the existing crossings in China are not equipped with centralized monitoring equipment, so it is impossible to monitor and alarm for the on-site crossing signaling equipment. Through circuit analysis, it is found that the lighting circuit of obstruction signal lacks the audio alarm function for the burnout of main filament, which can not meet the requirements of technical conditions and specifications, and there are great potential safety hazards. In view of the problems found, this paper puts forward two schemes: setting diode or the repeater relay of DZJ to improve the lighting circuit of obstruction signal. The improved lighting circuit is more rigorous and safer, which improves the traffic and transportation safety of railway crossing to a new safety height.

Key words: level crossing obstruction signal, lighting circuit, alarm for , main filament burnout, relay

摘要： 国内绝大多数既有道口未安装集中监测设备，无法对现场道口信号设备进行监测报警。经过电路分析，发现遮断信号机点灯电路缺少主丝（热丝）断丝音响报警功能，不能满足技术条件及规范的要求，存在较大安全隐患。针对发现的问题，提出设置二极管或设置灯丝转换继电器的复示继电器两个方案，对遮断信号机点灯电路进行改进。改进后的点灯电路更加严谨、更加安全，将铁路道口交通运输安全提升到新的安全高度。

关键词: 道口遮断信号机, 点灯电路, 主灯丝断丝报警, 继电器