接触网短路电流对轨道电路的影响

Influence of Short Circuit Current of Catenary on Track Circuit

接触网是给电气化铁路牵引供电的重要组成部分,一旦发生故障,短路电流将有可能损坏接触网系统的电气设备,影响行车安全,降低铁路运营效率。继电保护的可靠性尤为重要,能及时切断故障线路并反馈故障信息给电调,方便接触网的维修和抢修。本文结合ZPW-2000四显示自动闭塞轨道电路系统的接地连接方式和接触网短路电流径路,分析直接供电方式下接触网短路电流窜入贯通地线,抬升轨道电路设备对地电位,反向击穿烧坏轨道电路设备造成红光带故障的原因。从供电专业和信号专业2个方面制定并实施畅通回流通路的整改措施,以降低轨道电路设备对地电位,使其符合规定要求,从而排除设备运行安全隐患。

The reliability of relay protection is parti cularly important in ensuring the smooth operation of the electrified railway catenary.Short circuit currents can cause damage to the electrical equipment of the catenary system,while also affecting traffic safety and reducing overall efficiency.Therefore,it is necessary to cut off the faulty line and provide the electric dispatcher with the fault information promptly to facilitate maintenance and rush repairs.This paper examines the grounding connection mode of the ZPW-2000 four-display automatic block track circuit system as well as the short circuit current path of the catenary to analyze why the catenary may channel short circuit current into the through ground wire under the direct power supply mode.This,in turn,raises the ground potential of the track circuit equipment,causes reverse breakdown,burns the equipment and creates a red light band fault.Rectification measures must be formulated and implemented to ensure a smooth return path from power supply discipline and signal discipline.These measures will reduce the ground potential of track circuit equipment,so as to eliminate hidden dangers to the safe operation of equipment.