美利体育登录入口官网:DIN EN 50122-2:1999 轨道交通.固定美利体育官网首页网址.第2部分:对于由直流牵引系统的造成的铁路杂散电流影响所采取的保护措施
Railway applications - Fixed installations - Part 2: Protective provisions against the effects of stray currents caused by d.c. traction systems; German version EN 50122-2:1998