We use Sitras TCI thyristor-controlled inverters in the electric power supply for DC traction to 1.5 kV DC nominal voltage in order to make DC substations fitted with diode rectifiers recuperative. The big benefits: energy fed back into the system during braking can not only be used in the specific section of the power system but also transmitted to the connected medium-voltage power system via the substation. This prevents power losses. And other remote loads, such as vehicles operating on other line sections or elevators, escalators and lighting, can be powered with this energy.

In addition, Sitras TCI allows lower rated braking resistors to be used in the vehicles, for the connected mediumvoltage networks ensure virtually unlimited receptivity. Even existing substations can be upgraded easily with Sitras TCI.

The environment is also a major beneficiary of operational savings: Depending on system size and design, Sitras TCI can reduce the annual primary energy consumption by up to 1.5 million kWh, whereby power utilities can save around 900 t of CO₂.