DIN EN 50123-7-3-1999 轨道交通.固定设备.直流开关.第7部分:直流牵引设备专用测量、控制与保护装置.第3节:绝缘电压交换器与其他电压测量装置
Railway applications - Fixed installations; D.C. switchgear - Part 7: Measurement, control and protection devices for specific use in d.c. traction systems; Section 3: Isolating voltage transducers and other voltage measuring devices; German version EN 50