NF F41-020-7-2*NF EN 50123-7-2:2004 轨道交通 固定设备 直流开关装置 第7-2部分:直流牵引系统专用测量、控制和保护设备 独立式电流传感器和其它电流测量设备
Railway applications - Fixed installations - D.C. switchgear - Part 7-2 : measurement, control and protection devices for specific use in d.c. traction systems - Isolating current transducers and other current measuring devices