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
Railway applications—Fixed installations—DC 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
Railway applications—Fixed installations—DC switchgear—Part 7-1:Measurement,control and protection devices for specific use in d.c.traction systems—Application guide