RailVolt Traction Systems, an Indian rolling-stock supplier, engaged SHANYUAN for the traction converter DC-link busbar of a new regional locomotive. The part — 1800 V isolation, 2500 A continuous, designed to IEC 61373 category-2 vibration — completed type testing in 2025 and entered series production for 120 locomotives in 2026, with a 20-year service life target.
This case study is published as a representative engineering project. The product photograph and released drawing are illustrative of the delivered part; exact dimensions are covered by the customer's non-disclosure agreement.
Customer drawings are treated as confidential; excerpts shown here are provided with permission and illustrate the layer stack, terminal layout and dielectric boundaries of the delivered part.
| Customer & platform | RailVolt regional locomotive traction converter, 2500 A DC-link |
|---|---|
| Busbar type | Multi-layer laminated DC-link busbar, C11000 copper, 2.5 mm conductors |
| Dielectric system | Nomex + epoxy, 1800 V isolation, PD-free to 1.2 kV |
| Corriente nominal | 2500 A continuous, 4000 A 2 min |
| Elevación de temperatura | ΔT 28 °C at rated current, 70 °C ambient |
| Vibration | IEC 61373 category 2, 3 axes, 5 h each |
| Terminals | M12 studs for IGBT press-packs, blade for capacitor bank |
| Production | 120-locomotive program, 100% hi-pot and inductance scan |
| Quantified result | 1800 V isolation, cat-2 vibration pass, 28 °C ΔT, 2500 A |
RailVolt Traction Systems, an Indian rolling-stock supplier, engaged SHANYUAN for the traction converter DC-link busbar of a new regional locomotive. The part — 1800 V isolation, 2500 A continuous, designed to IEC 61373 category-2 vibration — completed type testing in 2025 and entered series production for 120 locomotives in 2026, with a 20-year service life target.
RailVolt's new regional locomotive uses a 2500 A traction converter with IGBT press-pack modules. Two constraints dominated the busbar design: the converter bay's mechanical envelope left only 40 mm for the DC-link interconnection, and the equipment must survive IEC 61373 category-2 vibration — the most severe rolling-stock environment — without joint fatigue over a 20-year life.
The customer specified 1800 V isolation for the DC-link (covering the catenary transient envelope of the regional network), PD-free operation to 1.2 kV, and a busbar that could be serviced without removing the converter from the locomotive.
SHANYUAN's design review applied the vibration and bolted-joint guide and the rail traction converter article, which covers the DC-link architecture used by modern regional locomotives.
The delivered busbar stacks three conductor pairs with Nomex insulation and epoxy edge sealing, sized for 1800 V isolation with a 20 mm creepage path across the sealed edge. All eight IGBT press-pack connections sit on M12 studs with Belleville washer stacks that maintain preload under vibration — the retention method documented in the vibration guide.
Joint design uses the multi-point contact pattern from the connections guide; each module connection has redundant contact area so a single point's relaxation never breaks the circuit. The capacitor bank connects through blade terminals welded to the stack.
The complete part fits the 40 mm bay envelope with 6 mm clearance to the housing, using the layer-count logic in the layer-count selection guide.
Temperature-rise testing at 2500 A in a 70 °C ambient chamber measured 28 °C rise with the hot spot on the capacitor tabs — inside the 30 °C budget. The thermal management guide documents the forced-air cooling assumptions used for the converter bay.
Nomex 410 was selected over PET for the higher short-term thermal margin during 4000 A overload and for its better dielectric consistency across the 20-year life. The insulation system passed a 4.5 kV hi-pot, PD-free to 1.2 kV, and 1000 thermal cycles from −40 °C to +125 °C. Dielectric selection rules are covered in the design guide and the partial-discharge resource.
Creepage and clearance follow the rail converter voltage class with the margins published in the ampacity chart reference tables.
Type testing ran at the customer's rail test laboratory: IEC 61373 category-2 vibration (3 axes, 5 hours each), thermal cycling, 4.5 kV hi-pot and PD verification. All passed on the first submission; the vibration test showed no measurable joint-resistance drift after 15 g random excitation.
Series production serves the 120-locomotive program at a rate aligned with the customer's converter build: 100% hi-pot and inductance scan per part, with per-batch dossiers from the quality laboratory. The factory tour shows the lamination and hi-pot stations used.
The program's quality plan follows the IATF-adjacent automotive discipline our team runs; the manufacturing process article explains the full production chain from stamping to final test.
The busbar met every target: 1800 V isolation, PD-free to 1.2 kV, 2500 A continuous with 28 °C rise, IEC 61373 category-2 vibration pass, and 20-year service life engineering.
Two locomotive prototypes have accumulated 60 000 km in trial service with zero busbar-related faults, and the customer reports that the converter bay assembly time dropped by 20 minutes per unit compared with the previous bolted-bar design.
For rail traction engineers, the rail and traction application page, the power electronics busbar range and the engineering contact form are the practical starting points.
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Nadia Rahman es ingeniera de calidad y cumplimiento con 9 años de experiencia en sistemas de calidad de componentes eléctricos. Gestiona los programas ISO 9001 e IATF 16949 de SHANYUAN, la inspección de entrada y salida, y la documentación de cumplimiento UL/IEC. Tiene un B.Sc. de la Universidad de
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