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 铁路设施.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 - 3 : measurement , control and protection devices for specific use in d . c . traction systems - isolating voltage transducers and other voltage measuring devices 铁路设施.固定设备.直流开关装置.第7 - 3部分:直流牵引系统专用测量控制和保护设备.独立式电压传感器和其他电压测量设备
