TRAC
Tractronic® on-board traction transformer
TRAC
- Application-optimized platform: ultra-light Thinity®, AC/DC locomotive, high-speed, EMU, tram-train and diesel AUX designs
- Machine-room, under-floor, low-floor and on-roof installation for maximum train-design flexibility
- Cooling with mineral oil, silicone or ester fluid (e.g. MIDEL 7131); cooling unit integrated in the full frame or as a separate component
- Integrated smoothing and filter reactors; auxiliary and heating windings to customer specification; traction windings usable as network filter reactors
- Q-1 supplier status with Deutsche Bahn AG; IRIS-compliant manufacturing in Nuremberg, Jinan and Jackson (MS)
AC and DC electric locomotivesHigh-speed trainsElectric multiple units (EMU)Tram trainsDiesel locomotive auxiliary supply
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Specifications
Main
| Product type | Tractronic® on-board traction transformer (platform, engineered per project) |
| Applications | AC/DC electric locomotives, high-speed trains, electric multiple units (EMU), tram trains, diesel-locomotive AUX |
| Design variants | Ultra-light Thinity®; single- and multi-phase; single- or multi-system versions |
| Installation | Machine room, under-floor, low-floor, on-roof |
| Manufacturing | Nuremberg, Germany (Center of Competence); Jinan, China; Jackson, Mississippi, USA |
Electrical ratings
| Rated power | All capacity ranges up to 15 MVA; above on request |
| Operating voltages | 1.5 kV DC, 3 kV DC, 11.5 kV AC, 15 kV AC, 25 kV AC, and other special voltage levels |
| Rated frequency | 16⅔ to 60 Hz (16⅔ / 50 / 60 Hz in reference designs) |
| Windings | Traction, filter, tertiary, auxiliary and heating windings per specification; integrated smoothing and filter reactors |
| Example — AC locomotive | 5.8 MVA, 15/25 kV, 16⅔/50 Hz, traction 4 × 1,300 kVA, tertiary 1 × 600 kVA |
| Example — high-speed | 5.848 MVA, 20 kV primary, 50 Hz, traction 4 × 1,462 kVA |
| Example — DC locomotive | 3 kV DC, 790 A, inductance 39 + 3.15 mH |
Mechanical & environment
| Cooling fluids | Mineral oil, silicone, or ester-based fluid (e.g. MIDEL 7131) |
| Cooling unit | Integrated in the transformer full frame or as a separate component, per space requirements |
| Weight (reference designs) | ≈1,920 kg (diesel AUX) to 12,500 kg (AC locomotive); Thinity® design reduces weight by up to 25% |
| Low temperature | Version for ambient temperature down to −50 °C (DC-locomotive reference) |
| Service life | Sealed diesel-AUX version for 30-year lifespan; long product lifecycle across platform |
Standards & certifications
| Testing | Routine and type tests in full compliance with IEC 60310; oil-gas analysis acc. to IEC 1181 (61181); PD, noise, shock & vibration special tests |
| Quality certifications | ISO 9001, ISO 14001, ISO 45001, ISO 22163 (IRIS) |
| Welding qualification | EN 15085-2 |
| Supplier status | Q-1 supplier for Deutsche Bahn AG |
Options & variants
Example designs from the Tractronic reference brochure — every Tractronic transformer is engineered per project. The cooling column reflects the media listed in the brochure's per-application reference tables. Tram example rated power is printed as '690 MVA' in the brochure, an evident typo for kVA (traction power is 2 × 345 kVA; its tram reference designs are 585 kVA).
| Application | Rated power (example) | Primary voltage | Frequency | Weight | Cooling (references) |
|---|---|---|---|---|---|
| Thinity® ultra-light | 2.716 MVA | 15 kV | 16⅔ Hz | 4,450 kg | Ester |
| AC locomotive | 5.8 MVA | 15 / 25 kV | 16⅔ / 50 Hz | 12,500 kg | Ester / mineral oil |
| DC locomotive | 3 kV DC, 790 A | 3 kV DC | — | 4,150 kg | Ester / mineral oil |
| Diesel locomotive (AUX) | 1,130 kVA | 3 × 528 V | 60 Hz | 1,920 kg | Ester |
| High-speed train | 5.848 MVA | 20 kV | 50 Hz | 6,200 kg | Ester / mineral oil |
| Electric multiple unit (EMU) | 1.816 MVA | 25 kV | 50 Hz | 2,900 kg | Ester / mineral oil |
| Tram train | 690 kVA | 25 kV | 50 Hz | 2,150 kg | Silicone / mineral oil |
Documents & downloads
Brochure Tractronic® Traction Transformers (Siemens Energy, 2021, PTNP-B10011-00-7600)
