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Sitras TCIThyristor controlled inverter for DC traction power supply

Technical data

Nominal voltage [V DC] 750 1,500

Rated recovery current1)

– for 30 s– for 70 s

[A][A]

3,0000

1,0000

Effi ciency 0.96 0.96

Auxiliary voltage [V AC]or [V DC]

110...23060...230

110...23060...230

Width [mm] 2,400 1,8002)

Height [mm] 2,300 2,300

Depth [mm] 1,000 1,000

Weight [kg] 2,600 5,000

Maximum ambient temperature3) [°C] +40 +40

Maximum site altitude above sea level3) [m] 1,000 1,000

Degree of protection acc. to IEC 60529 IP20 IP20

Color RAL 7047 RAL 7047

1) other values on request2) the autotransformer will be installed separately3) without power derating

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 rectifi ers can acquire the capability to return surplus energy to the system.

Features Braking energy can be transmitted via the medium-voltage power system to loads that are even further away

The medium-voltage power system is usually receptive to an unlimited amount of energy

The number of brake resistors on the vehicles can be kept to a minimum

Robust, reliable thyristor technology Substations can subsequently aquire the capability to return surplus energy to the system with an additional inver-ter.

Remote parameterization, control and diagnosis possible via standardized communication interface

1

2

8

11

5

7

6

3

4

9

10

2

The inverters are installed in steel cubi-cles and are designed for indoor installa-tion.

All the main components are easily acces-sible from the front and can therefore be easily replaced. This type of construction is suitable for mounting against a wall.

Cubicle designThe inverter components are housed in a panel group of three or four cubicles. The system can therefore be easily inte-grated into existing substations. With the 750 V version, the autotransformer is already integrated in the cubicles. With the 1,500 V version or the 750 V version with more power, the autotransformer is installed separately.

Design of primary equipment

Main componentsThe line-commutated inverter comprises: B6 thyristor bridge with fuses for converting direct current into alter-nating current,

Autotransformer for matching the secondary voltage of the rectifi er transformer to the B6 thyri-stor bridge,

DC choking coil for limiting the circuit currents bet-ween diode rectifi ers and the thyristor inverter,

AC circuit-breaker and DC disconnector for protection purposes and for isola-tion of the Sitras TCI.

Autotransformer installed separately

Example: Layout of the Sitras TCI, 1,500 V (autotransformer is installed separately)

1 Ventilator module2 Thyristor firing unit3 B6 thyristor bridge4 AC circuit-breaker5 DC disconnector6 DC power terminals L+ and L–7 Current controller (microprocessor)8 AC power terminals (hidden),

connection to rectifier transformer9 Overall programmable logic control10 DC choking coil11 AC power terminal (hidden),

connection to autotransformer

TerminalsIn the case of the DC power terminals, the L+ and L- terminals are arranged as cable connections in the downward direc-tion. The AC power terminals are arran-ged also in the downward direction.

3~ AC

DC

3

Secondary equipment

Flow of energy from the vehicle via the inverter to the medium voltage power grid

Inverters are for the most part used at those points at which the transfer of energy between vehicles is frequently incomplete.

Function

The braking energy of the vehicle can be transferred at any time via the inverter to the constantly receptive medium vol-tage power system. Therefore the energy can also be transmitted over greater distances.

Closed looped controlThe closed looped control has been desi-gned such that the system meets all the requirements with regard to the power supply system of DC railways in a highly dynamic manner.

Operator control and visualizationThe ergonomically designed Simatic® Touch-Panel and the conventional ope-rating controls for the most important functions provide the operating staff with a quick and reliable overview of the ope-rating state of the system.

Comfortable operator control and visuali-zation via the Simatic Touch-Panel

CommunicationThanks to the standardized communica-tion interfaces modular design, all the standard media such as WAN, ISDN or modem can be used for remote link-up to the central control room.

Sitras TCI uses the PROFIBUS protocol. Additional protocols can be implemented on request.

Medium voltage power grid

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Siemens AGIndustry SectorMobility DivisionComplete TransportationMozartstraße 33b91052 ErlangenGermany

electrifi cation.mobility@siemens.comwww.siemens.com/mobility/electrifi cation

© Siemens AG 2010

Product Information / Version 1.1.0 / No. A6Z08110420199

The information in this document contains general descriptions of the technical options available, which do not always have to be present in individual cases. If not stated otherwise, we reserve the right to include modifications, especially regarding the stated values and dimensions.

Scope of application

The AC side of the inverter is connected to the substation at the rectifi er transfor-mer, the DC side at the DC switchgear.

Sitras TCI is thus directly connected in parallel with a diode rectifi er. This additi-onal inverter concept not only represents a big space-saving solution, it is also especially suitable for retrofi tting in exi-sting substations.

With the integrated AC circuit-breaker and DC disconnector, Sitras TCI can be isolated separately.

The auxiliaries (ventilators, closed loop control supply, switches, contactors, watchdogs) are supplied by means of a single-phase auxiliary voltage available in the DC substation.

Schematic diagram: Example for the integration of the Sitras TCI into an existing DC substation with diode rectifier

Medium voltage switchgear

DC disconnector

DC switchgear

Line

Sitras TCI

DC choking coil

B6 thyristorbridge

Diode rectifier

AC circuit-breaker

Auto-transformer

Rectifier transformer