DIN V ENV 50123-7-1:1999
轨道交通.固定设施.直流转换开关装置.第7部分:直流牵引系统专用的测量、控制和保护装置.第1节:应用指南
Railway applications - Fixed installations - D.C. switchgear - Part 7: Measurement, control and protection devices for specific use in d.c. traction systems; Section 1: Application guide; German version ENV 50123-7-1:1998