AC traction power supply
Optimize mobility
As the need for mobility increases, more efficient transport concepts are needed. By electrifying, automating, and digitalizing infrastructures, we’re already setting the benchmarks for future mobility. As one of the world’s leading suppliers of electrotechnical systems, Siemens is the right partner for your AC traction power supply in main-line and regional rail service – from consulting and planning to project implementation, commissioning, and worldwide service. With Siemens, you can rely on highly available and reliable systems and low life-cycle costs.
AC traction power supply – perfectly planned, perfectly implemented
Our comprehensive product family provides you with an optimal solution for every task related to your AC traction power supply. Whether it is high-voltage switchgear, protection technology, or converters, you’re guaranteed consistently outstanding quality with seamlessly coordinated components. You’ll benefit by saving resources in the planning and operation of your AC traction power supply – right from the start.Future-oriented AC traction power supply: The system and its components
High-voltage switchgear for AC traction power supply
Depending on the substation capacity, connection at the 110- to 400-kV level is implemented either as stubs or looped in. The high-voltage switchgear associated with the substation is usually limited to two incoming feeder panels, one busbar, one longitudinal coupling, and two transformer feeders. The system can be designed as an outdoor or space-saving gas-insulated version.
Traction power transformers for AC traction power supply
In contrast to the public utilities sector, traction power transformers operate with a single phase and step down the high voltage to the contact line voltage of 15-kV or 25-kV. All transformers are either self-cooled or forced air-cooled oil-immersed transformers with a typical power output between five and 85 MVA.
Power traction systems: Choose from several types
Outdoor, gas-insulated, or an air-insulated indoor version: You can rely on our medium-voltage switchgear and components to supply the overhead contact line and ensure reliable tripping in the event of a short-circuit.
Sitras 8DA11/8DA12 gas-insulated indoor switchgear for AC traction power supply
The Sitras 8DA11 (1-pole) and Sitras 8DA12 (2-pole) SF6-insulated switchgear are intended to be used to feed the overhead contact line in AC traction power supply systems. The design is based on the proven 3-pole type of the 8DA10/8DB10 switchgear for power supply companies and industrial plants.
Your benefits:
● Maximum safety for personnel and equipment proven by extensive type testing
● Cost-effective: maintenance-free and compact
● Modular design for flexible adaptation to a wide range of requirements
● Vacuum circuit-breaker by switching in vacuum:
▪ No toxic substances created by arcs in SF6
▪ No impairment of SF6 insulating properties
● Reduced risk of internal arc faults thanks to single-pole enclosure
Sitras ASG15 air-insulated indoor switchgear 15 kV for AC traction power supply
The Sitras ASG15 air-insulated medium-voltage switchgear is intended as a linking element between the traction power distribution level and the catenary system. It ensures a secure and reliable power supply in single-phase 16.7-Hz rail systems. The type-tested, metal-clad, compact switchgear panels meet all the requirements for powerful AC traction power supply components.
Your benefits:
● Maximum equipment and personnel safety
▪ Metal-clad partitions
▪ Internal arc-classified
● Factory-assembled and compact
▪ Panel-integrated control and protection systems
▪ Integrated, feeder-related contact-line testing device (AGP)
▪ 40-kA circuit-breaker with only one interrupter
● High system availability with low life-cycle costs
▪ Low-maintenance components
▪ Circuit-breaker truck
Sitras ASG25 air-insulated indoor switchgear 25 kV for AC traction power supply
The Sitras ASG25 air-insulated switchgear is intended for use in single-phase AC traction power supply systems. It’s a type-tested, metal-clad 1-pole switchgear for indoor installation with a fixed-mounted vacuum circuit-breaker.
Your benefits:
● High personnel safety
● Make-proof grounding of cables and busbar by circuit-breaker
● Minimal maintenance thanks to total enclosure and maintenance-free vacuum interrupters
● Optimal availability
● Easy replacement of vacuum circuit-breaker using a service truck
3AH47 indoor vacuum circuit-breakers for AC traction power supply
3AH47-type vacuum circuit-breakers are 1-pole or 2-pole circuit-breakers for indoor applications. They’re ideal for the special requirements and switching tasks in AC traction power supply systems.
Your benefits:
● Proven vacuum technology for reliable switching duties
● Maximum operating safety thanks to:
▪ Rated short-circuit breaking currents up to 50 kA
▪ Opening time up to 17 ms
● Large number of make-break operations up to 60,000 times
● Maintenance-free up to 10,000 make-break operations
● Compact design
3AF04/3AF05 outdoor vacuum circuit-breakers for AC traction power supply
The 3AF04/3AF05 vacuum circuit-breakers are 1-pole or 2-pole breakers for outdoor applications. They’re ideal for the special requirements and switching tasks in AC traction power supply systems.
Your benefits:
● Proven vacuum technology for reliable switching duties
● Maintenance-free up to 10,000 make-break operations
● Compact weather-proof design
7ST61/7ST63 numerical overhead contact-line protection for AC traction power supply
The Siprotec 7ST61/7ST63 numerical overhead contact-line protection relay is a selective and fast-responding protection device for overhead contact lines fed from one or multiple points in AC traction power supply systems. The relay has all the functions needed to protect a section of the overhead contact line and can therefore be deployed universally.
Your benefits:
● Integrates protection, control, measurement, and automation functions in a single unit
● Shortest tripping time thanks to adaptive protection algorithms
● Efficient operation thanks to a universal tool for all tasks
● Adapted to different modes thanks to parameter-set switchover
● Flexible availability of all standard communication protocols
Mobile rail VAR compensator for AC traction power supply
In order to minimize feedback to the public grid and improve voltage quality in single-phase traction power networks, we offer you an active and mobile reactive-power compensation system based on voltage-sourced converter technology.
Your benefits:
● The innovative multilevel converter concept ensures
▪ Compact design in the 40-foot-high cube standard container
▪ Connection of the converter to the contact line without a heavy transformer
▪ High availability thanks to redundancy in the converter power circuit
▪ Low losses over the entire operating range
● Alternative auxiliary power supply via the contact line or an external 400-V 3-phase AC network
● Option for automatic or remote control operation
● Control of contact line voltage by means of capacitive and inductive reactive power within performance limits
Sitras RAB plus active balancer for AC traction power supply
The active balancer helps you prevent asymmetries in the public three-phase grid when high levels of single-phase power are drawn for the traction power supply. Thanks to multilevel technology, it compensates for the reactive power of the rail system and produces an extremely small amount of feedback to the grid.
Your benefits:
● Minimized engineering effort thanks to standardized component design
● Can be used for 1-phase 25-kV and autotransformer systems
● The innovative, modular, multilevel-technology enables:
▪ Compact containerized design
▪ Low space requirements
▪ Low noise emissions
▪ Low losses over the entire operating range thanks to low switching frequency
▪ High EMC
Sitras SFC plus static frequency converters for AC traction power supply
Sitras SFC plus-type static frequency converters supply single-phase traction power networks from three-phase networks.
Your benefits:
● Innovative multilevel traction converter concept reduces
▪ Noise emissions
▪ Space requirements
▪ Maintenance effort
● High degree of efficiency over the entire operating range for optimized use of primary energy
● Excellent availability thanks to the option for redundancy in the converter power circuit
● Modular converter ensures ideal adaptation to customer requirements
● Universal application for central and decentralized traction power supply systems
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Optimize mobility – with the AC traction power supply
AC traction power supply in main-line and regional rail service – from consulting and planning to project implementation, commissioning, and worldwide service: With Siemens, you can rely on highly available and reliable systems and low life-cycle costs.
