BS EN 50123-7-3-1999 轨道交通.固定设备.直流开关装置.直流牵引系统专用测量、控制和保护设备.绝缘电压传感器和其他电压测量设备
Railway applications - Fixed installations - d.c. switchgear - Measurement, control and protection devices for specific use in d.c. traction systems - Isolating voltage transducers and other voltage measuring devices