南京地铁大胜关桥与国铁交流系统共地方案分析

国铁和地铁同桥水平近距离敷设,在国内尚属首次,并且无经验可参考.由于地铁和国铁两个供电系统的接地及连接方法有着本质的不同,因此必需考虑接地问题.通过对地铁、国铁供电系统与地关系的说明,从杂散电流防护、绝缘、轨电位等角度,对南京大胜关桥地铁和国铁采用绝缘地还是共地方案分别进行了分析.基于人身设备安全,推荐采用共地方案.

Analysis of Nanjing Subway Bridge Common Earth between DC System and AC System

It is the first time that the subway line and railway line shall be laid out on the same bridge in near distance,but there are no experiences in China up to now.Then the earth problem appears because the grounding and connection methods of railway and subway power supply systems are essentially different.Based on an introduction of the relationship between power supply system and grounding,both of subway and railway,also combined with the stray current protection,insulation and rail potentials,the feasibility of separate earth and common earth schemes on Nanjing subway Dashengguan Bridge is analyzed.Bases on the safety of people and equipment,the common earth scheme is recommended.