Enlarge

For our DC substations we use only the same proven standard mediumvoltage switchgears as also used by utilities and industrial plants. The prefabricated, typetested equipment with air or gas insulation complies with all national and international standards and guarantees the highest level of safety for the operating personnel.

Enlarge

The rectifier transformer is connected to the input end of the rectifier and transforms the medium voltage down to the value required for connection to the rectifier. Designed especially for the highly dynamic rectifier loading, our rectifier transformers have power ratings that range from approx. 1 MVA for stations supplying trolleybuses and trams to approx. 7 MVA for the operation of heavy subways. Industry-proven castresin transformers are used which fulfill also special requirements with regard to fire protection and safety. As an alternative, standard oil-insulated transformers are used.

Enlarge

Sitras REC type rectifiers are designed to supply traction power to DC-operated mass transit systems and main line railways. The special demands of these rail services are met by the use of aircooled disc-type diodes with a high blocking voltage.

Enlarge

These withdrawable diode rectifiers are designed to supply traction power to DC operated rail systems. The Sitras REC-W is based on the serviceproven series of fixed installed diode rectifiers using air-cooled disctype diodes with a high blocking voltage.

Enlarge

Sitras TCR controlled thyristor rectifiers are used to supply power to DC railways for mass transit systems and main line railways. Up to a maximum loading current, they are capable of keeping the supply voltage of a substation to an almost constant level.

Enlarge

Sitras TCI thyristor controlled inverters are used in the power supply system of DC railways. Through the parallel connection of such an inverter, DC substations equipped with diode rectifiers can acquire the capability to return surplus energy to the system.

Enlarge

Sitras TCD converters are two-way converters capable of returning surplus energy to the supply system. They combine therefore the functions of the controlled rectifier and the inverter.

Enlarge

The Sitras DSG DC switchgear is used in the power supply for DC railways in mass transit and main line systems. Sitras DSG is a type-tested, metal-enclosed, compartmentalized switchgear unit for indoor installation and meets all the requirements placed in today's DC traction power supply systems.

Enlarge

The Sitras CSG DC switchgear is used in the power supply for DC vehicles in mass transit systems, especially in tram and trolleybus systems. Sitras CSG is a type-tested, metal-enclosed indoor switchgear unit with integrated diode rectifier. It is designed for use in DC traction power supply systems with lower to medium power ratings.

Enlarge

The Sitras SCS-DC station control system performs all the control functions as well as protection and communication tasks in the DC traction power supply. Thus it provides the operating staff with a quick and reliable overview of the operating state of the system. Besides the detailed fault alarm output that comes with the basic design, the Sitras SCS-DC station control system can also be optionally equipped with an operator control panel and providing an equipment status output, dynamic substation control diagrams and even complete local substation control.

Enlarge

The Sitras PRO combined DC protective unit and controller is used in the power supply for DC railways in mass transit and main line systems up 3,000 V DC. It protects DC switch gear and contact line systems against critical operating conditions and detects short-circuits during the current rise even before the maximum short-circuit currents are reached.

Enlarge

With the Sitras SES stationary energy storage system the surplus braking energy generated by modern mass transit vehicles can be used. The energy storage system operates in parallel with the existing traction power supply system and is based on double-layer capacitor technology.

Enlarge

The Sitras MES mobile energy storage unit will be used for rail vehicles and enables the storage of the braking energy. Powerful double-layer capacitors will be used as storage technology.

Enlarge

The Sitras HES hybrid energy storage system will be used for rail vehicles and enables the storage of the braking energy and the operation without overhead contact line. It combines the advantages of powerful double-layer capacitors and traction batteries.

Enlarge

In DC traction systems, impermissible touch voltages may occur between the return circuit and the structure earth due to operational and short-circuit currents. In this case, a voltage-limiting device must be used between the return circuit and the structure earth in accordance with IEC 62128-1 / EN 50122-1. The Sitras SCD reduces excessively high voltages by reliably short-circuiting the return circuit and structure earth temporarily. Furthermore, the formation of stray currents is minimized by automatic opening of the short-circuiting device.

Enlarge

In DC traction systems, impermissible touch voltages may occur between the return circuit and the structure earth due to operational and short-circuit currents. The persistence of these voltages must be prevented by means of a voltage-limiting device in accordance with IEC 62128-1 / EN 50122-1. The Sitras SCD-C reduces excessively high voltages by reliably short-circuiting the return circuit and structure earth temporarily.

Furthermore, the formation of stray currents is minimized by automatic opening of the short-circuiting device.

Enlarge

The Sitras SMS stray-current monitoring system is used to monitor the track potential of DC railway networks. This system permits evaluation of the stray-current conditions of the track and the early detection of insulation deficiencies, thus enabling measures to be taken to prevent damage due to stray-current corrosion.