轨道交通 地面装置 直流开关设备 第7-3部分:直流牵引供电系统专用测量、控制和保护装置 隔离电压变送器和其他电压测量设备
Railway applications—Fixed installations—DC switchgear—Part 7-3: Measurement, control and protection devices for specific use in d.c. traction systems—Isolating voltage transducers and other voltage measuring devices