DIN EN 50123-7-2-1999 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2节:绝缘电流变换器与其他电流测量装置
Railway applications - Fixed installations; D.C. switchgear - Part 7: Measurement, control and protection devices for specific use in d.c. traction systems; Section 2: Isolating current transducers and other current measuring devices; German version EN 50