Brochure · EN — Product brochure for the Tractronic® family of on-board traction transformers from Siemens Energy, covering single- and multi-phase designs up to 15 MVA (and above on request) for machine-room, under-floor, low-floor and on-roof installation. It presents the technical envelope (16⅔–60 Hz; 1.5 kV DC, 3 kV DC, 11.5/15/25 kV AC and special voltage levels; oil, silicone or ester cooling), the application-specific product lines — ultra-light Thinity®, AC/DC electric-locomotive, AUX diesel-locomotive, high-speed, EMU and tram-train transformers — each with an example data sheet and a selected-references table, the global factory network (Nuremberg, Jinan, Jackson) with certifications, and the IEC 60310 routine, type and special test program.
Siemens Energy builds Tractronic® on-board traction transformers across every capacity range for rail-based vehicles. Because these products have long lifecycles, the designs prioritize maximum reliability, economic efficiency and safety, and are tailored through parameters such as power rating (frequency, capacity, voltage), dimensions, weight and installation location, dissipation and short-circuit voltages, driving patterns and medium-frequency performance, loss and impedance-voltage characteristics, and material choices for environmental requirements (e.g. ester coolant).
The platform is field-proven in three application classes: locomotive platforms operating worldwide in all climatic conditions for heavy-duty transport; high-speed long-distance rail in Europe, China and Turkey, where safety, availability, reliability and environmental friendliness are paramount; and Electric Multiple Units (EMU) in commuter and suburban networks, designed to run efficiently for decades.
The transformers increase train efficiency and performance, handle maximum ratings in a minimum of space, serve local-content demands, and are supplied to rail operators and train manufacturers worldwide.
Siemens Energy holds Q-1 supplier status with Deutsche Bahn AG and is certified to ISO 9001, ISO 14001, ISO 45001, ISO 22163 (IRIS) and welding qualification EN 15085-2. Close cooperation with international standards committees ensures compliance with applicable requirements.
The range covers single-phase and multi-phase transformers for machine rooms, under-floor and low-floor applications, and on-roof installation, in all capacity ranges up to 15 MVA and above on request. Cooling units can be integrated into the transformer frame or supplied as separate components, with a choice of oil, silicone or environmentally friendly ester-based cooling fluids (e.g. MIDEL 7131).
Technical performance: frequencies from 16⅔ to 60 Hz; operating voltages 1.5 kV DC, 3 kV DC, 11.5 kV AC, 15 kV AC, 25 kV AC and other special voltage levels; single- or multi-system versions; integrated smoothing and filter reactors; auxiliary and heating windings per customer specification; traction windings usable as network filter reactors.
A worldwide manufacturing and service network with uniform IRIS-compliant quality standards delivers timely responses to inquiries, short processing times on spare-parts orders, fast on-site service access, and components and services anywhere at any time.
As part of the traction chain, on-board traction transformers are crucial to train and operator performance. Each Tractronic® type is designed and optimized for a specific train class according to frequency, rating and voltage; required dimensions and weights; loss and impedance-voltage characteristics; operational cycles and frequency-response behavior; and environmental requirements.
The product lines are: ultra-light Thinity® transformers; Tractronic® AC and DC transformers for electric locomotives; Tractronic® AUX transformers for diesel locomotives; and Tractronic® transformers for high-speed, EMU and tram-train applications.
The Thinity® design cuts transformer weight by up to 25% and allows flexible rooftop or under-floor installation with a systematic tank shape adaptable to different train types. Example unit: 2.716 MVA at 16⅔ Hz; primary 15 kV, traction 4 x 961 V, filter 1 x 511 V; traction power 4 x 679 kVA plus 1 x 25 kVA filter; weight 4,450 kg.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1 | World | 2.716 | 15/25/4 x 0.961/0.963 | 16⅔ / 50 | Ester |
| 2 | Germany | 1.68 | 15/25/2 x 1.062 | 16⅔ / 50 | Ester |
AC-locomotive transformers feature ester cooling and insulation liquids for maximum environmental compliance, compatibility with 25/15 kV AC and 1.5/3 kV DC voltages, and weight-optimized design. Example unit: 5.8 MVA at 16⅔ Hz/50 Hz; primary 15 kV/25 kV, traction 4 x 1.935 V/4 x 1.928 V, tertiary 1 x 998 V/1 x 1.496 V; traction power 4 x 1.300 kVA plus 1 x 600 kVA tertiary; weight 12,500 kg. References marked * here and in the following tables were delivered to Russia before February 2022.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1 | Australia | 4.726 | 25/6 x 0.99 | 50 | Mineral oil |
| 2 | Belgium | 6.3 | 25/4 x 1.849 | 50 | Ester |
| 3 | World | 5.8 | 15/25/4 x 1.94 | 16⅔ / 50 | Ester |
| 4 | USA | 6.2 | 25/4 x 1.957 | 60 | Ester |
| 5 | World | 5.8 | 15/25/4 x 1.5 | 60 | Ester |
| 6 | World | 2.3 | 15/4 x 1.063 | 16⅔ | Ester |
| 7* | Russia | 2.6 | 25/2 x 1.0 | 50 | Mineral oil |
| 8* | Russia | 5.75 | 25/4 x 0.99 | 50 | Mineral oil |
DC-locomotive units are installed half under floor and half in the machine room, with a version rated for ambient temperatures down to –50 °C. Example unit: rated voltage 3 kV; inductance 39 + 3.15 mH; rated current 790 A; weight 4,150 kg.
| Selected references | Country/Region | Rated voltage [kV] | Cooling medium |
|---|---|---|---|
| 1 | Germany | 3 DC | Ester |
| 2* | Russia | 3 DC | Mineral oil |
AUX transformers for diesel locomotives are delivered as high-quality, ready-to-use units in a sealed version designed for a 30-year lifespan. Example unit: 1,130 kVA at 60 Hz; primary 3 x 528 V, secondary 3 x 480 V; weight 1,920 kg.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1 | USA | 0.756 | 3 x 0.528 | 60 | Ester |
| 2 | USA | 1.130 | 3 x 0.635 | 60 | Ester |
High-speed units use Nomex insulation for maximum energy density, an integrated transformer-plus-cooling-system design, and Pfisterer plug connections for fast, easy installation. Example unit: 5.848 MVA at 50 Hz; primary 20 kV, traction 4 x 1.844 V; traction power 4 x 1.462 kVA; weight 6,200 kg.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1* | Russia | 5.52 | 25/4 x 1.55 | 50 | Mineral oil |
| 2 | China | 5.848 | 25/4 x 1.850 | 50 | Mineral oil |
| 3 | China | 3 | 25/0.899 | 50 | Mineral oil |
| 4 | United Kingdom | 4.804 | 25/4 x 1.848 | 50 | Ester |
| 5 | Germany | 4.6 | 15/4 x 1.103 | 16⅔ | Ester |
| 6 | Europe | 4.6 | 15/25/4 x 1.103 | 16⅔ / 50 | Ester |
EMU transformers feature an integrated expansion vessel, two redundant pumps, and ester cooling and insulation liquids for maximum environmental compliance. Example unit: 1.816 MVA at 50 Hz; primary 25 kV, traction 4 x 1.853 V, filter 1 x 461 V; traction power 4 x 448 kVA plus 1 x 24 kVA filter; weight 2,900 kg.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1 | Europe | 1.816 | 25/4 x 1.853 | 50 | Ester |
| 2 | India | 1.25 | 25/0.855 | 50 | Mineral oil |
| 3 | Malaysia | 1.932 | 25/4 x 0.951 | 50 | Mineral oil |
| 4 | Europe | 1.28 | 25/2 x 0.640 | 50 | Ester |
| 5 | Switzerland | 2.64 | 15/4 x 0.660 | 16⅔ | Ester |
| 6 | United Kingdom | 2.204 | 25/6 x 0.449 | 50 | Ester |
| 7 | Europe | 1.972 | 15/4 x 0.980 | 16⅔ | Ester |
| 8 | Germany | 2.2 | 15/2 x 0.95 | 16⅔ | Ester |
| 9 | Europe | 2.2 | 25/4 x 0.55 | 50 | Ester |
| 10* | Russia | 1.65 | 25/2 x 0.86 | 50 | Mineral oil |
| 11 | Europe | 1.3 | 25/2 x 1.88 | 50 | Ester |
| 12* | Russia | 3.0 | DC | Mineral oil |
Tram-train transformers are roof-mounted and built to extremely low production tolerances. Example unit: rated power 690 MVA (as printed; context indicates kVA) at 50 Hz; primary 25 kV, traction 2 x 420 V; traction power 2 x 345 kVA; weight 2,150 kg.
| Selected references | Country/Region | Rated power [MVA] | Rated voltage [kV] | Rated frequency [Hz] | Cooling medium |
|---|---|---|---|---|---|
| 1 | Germany | 0.585 | 15/0.996 | 16⅔ | Silicon |
| 2 | France | 0.585 | 25/2 x 0.42 | 50 | Mineral oil |
Siemens Energy operates a worldwide manufacturing and service network with uniform quality standards at all factories, which also satisfies local-content requirements. Developments are typically designed at the Center of Competence in Nuremberg, Germany, where engineering and production collaborate closely in the prototype stage to prepare products for serial production in Germany, China and the USA.
Nuremberg, Germany: since 2009 the dedicated traction-transformer factory (relocated from the historical central-Nuremberg power-transformer plant) and global Center of Competence — global sales and key-account management, electrical and mechanical design, strategic procurement and quality management. Lean production ensures high quality, short engineering processes and fast delivery lead times; it is also the main repair center for all Tractronic® types. Certificates: ISO 9001, ISO 14001, ISO 50001, ISO 45001, ISO 22163 (IRIS), welding qualification to EN 15085-2.
Jinan, China: established 2008, one of the major Siemens Energy transformer factories worldwide — oil-immersed power transformers up to 750 MVA/750 kV, generator transformers, traction transformers, ester-oil distribution transformers, line feeders and prefabricated substations, plus lifecycle management and services. Supplies Tractronic® transformers for locomotives, high-speed trains and EMUs for the local market and global projects, and offers local repairs. Certificates: ISO 9001, ISO 14001, ISO 45001, ISO 22163 (IRIS), welding qualification to EN 15085-2.
Jackson, Mississippi, USA: manufactures IEEE-compliant transformers with a focus on product design, durability and lifecycle management, combining local knowledge with global reach under a strict vendor code of conduct. Certificates: ISO 9001, ISO 14001, OHSAS, ISO 45001, ISO 27001.
Tractronic® traction transformers are tested essentially the same way as power transformers, with routine and type tests in full compliance with IEC 60310.
Routine tests: measurement of winding resistance, voltage ratios, no-load primary current and losses; separate-source and induced voltage withstand tests; measurement of impedance voltages; determination of load losses.
Type tests (per customer requirements): winding resistances, voltage ratios, no-load primary current and losses; lightning-impulse, separate-source and induced voltage withstand tests; impedance voltages; total and load losses; temperature-rise test; cooling-unit power consumption; oil-gas analysis according to IEC 1181.
Special tests: magnetic-field-strength measurement at different distances from the tank wall in three orthogonal directions; noise measurements; partial-discharge measurement; mathematical proofs of sudden short-circuit resistance (with optional testing in an accredited third-party laboratory); shock and vibration tests.
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