客运专线无碴轨道桥梁综合接地及其必要性

The Method and Necessity of Applying General Earthing on Ballstless Track Bridge of Passenger Dedicated Railway Line

研究目的:探讨我国客运专线无碴轨道桥梁上接地原则、要求和措施。研究方法:通过定性分析雷击和接触网故障情况下产生的危害,同时借鉴国外先进国家的接地理念、有关标准,结合我国有关接地规程规范,提出客运专线无碴轨道桥梁采取综合接地的必要性和采取的具体措施。研究结论:在高架桥地段将综合接地系统与桥墩基础钢筋可靠电气连接是必要的,同时针对我国客运专线的特点,即为了不影响信号轨道电路传输和满足牵引供电短路保护的需要,在无碴轨道板内采取单独设置不形成回路的小区段(约100 m左右)接地钢筋。

Research purposes： The paper discusses the principle, requirement and measure of general earthing on the ballastless track bridge of the passenger dedicated railway line in China. Research methods ： By analysing the disserve caused by the lightning strike and the failure of the OCS, and refering to earthing concepts and related codes in both developed countries and China, this paper proposes the necessary and concrete measures of using general earthing on the ballastless track bridge of the passenger dedicated railway line. Research conclusion： It is necessary to make reliable electric connection between the abutment of the bridge and the general earthing system in the section of the viaduct. Based on the character of passenger dedicated railway line in China and in order to avoid effect to the signal track circuit and meet the needs of short - circuit protection of traction power supply system, we set section （about 100m） with earthing reinforcing steel bar in ballastless track board and make each reinforcing steel bar connected to general earthing system in its own section. Now, this measure is applying in ZhengXi passenger dedicated railway line.