Touch voltage protection cubicles

General

In DC traction systems, unacceptable touch voltages may occur between the negative rail and the structure earth due to operational and short-circuit currents.

In such cases, a short-circuit device must be used to limit the voltage between the return circuit and the structure earth, preventing dangerous touch voltages.

Applications

• Protection of personnel
• Prevention of unacceptable voltage at passenger stations
• Protection of installation
• Removal of touch voltage in the equipment area
• Monitoring of the potential of the return circuit

Main features

The negative earth protection device fulfills all the criteria of EN50122 standards. The TVP-3 is specifically designed for 3000VDC networks and is based on a hybrid switch consisting of anti-parallel thyristors and DC contactors connected in parallel.

• Low maintenance due to use of thyristors
• Maximum protection for personnel and equipment thanks to short reaction time.
• Simple installation through compact design
• No commissioning required as the system is supplied operation ready.

Example of application :