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Precision-engineered current transformers and power equipment designed for the demanding requirements of railway electrification and traction power distribution.
A dry type transformer for railway and traction power systems is a specialized electrical device engineered to convert and distribute high-voltage power for rail electrification networks — without the use of liquid insulation. Unlike oil-immersed transformers, dry type variants utilize solid or cast-resin insulation systems, making them the preferred choice for enclosed railway environments including underground metro stations, tunnels, onboard train applications, and trackside traction substations.
Dry type transformers are critical components in both AC (alternating current) and DC (direct current) traction power architectures. They step down grid-level voltages (typically 110kV–220kV) to traction voltages (such as 25kV for high-speed rail or 750V/1500V DC for urban metros), ensuring stable, continuous energy delivery to electric locomotives, EMUs (Electric Multiple Units), and light rail vehicles.
⚡ Global rail electrification is projected to surpass USD 38 billion by 2030, with dry type transformers playing an increasingly central role in safe, sustainable traction power distribution across metro, high-speed rail, and freight electrification projects worldwide.
The global market for dry type transformers in railway and traction applications has witnessed robust growth over the past decade, driven by surging investments in urban metro expansion, high-speed rail infrastructure, and the electrification of freight corridors. Asia-Pacific dominates market demand — led by China's aggressive HSR (High-Speed Rail) buildout and India's metro proliferation — while Europe and the Middle East represent fast-growing secondary markets owing to sustainability mandates and the push toward electrified public transport.
China alone operates over 40,000 kilometers of high-speed rail, the world's largest network, requiring thousands of traction substations each equipped with dry type transformers. State-owned enterprises and specialized electrical manufacturers in China — particularly those based in the Liushi electrical industry cluster — have become globally competitive suppliers of these critical components, combining IEC/GB standard compliance with cost-effective production capabilities.
The selection of dry type over oil-immersed transformers in railway environments is driven by a convergence of safety, maintenance, and environmental factors uniquely critical in transit infrastructure:
From high-speed mainline electrification to complex urban metro grids, dry type transformers serve diverse and mission-critical roles across the entire railway power ecosystem.
In high-speed rail systems operating at 25kV 50Hz AC, traction substations are the backbone of power delivery. Dry type transformers installed at these substations step down voltage from the national grid (110kV or 220kV) and distribute it to the catenary wire system. The transformers must handle continuous high loads, withstand voltage fluctuations from regenerative braking, and maintain insulation integrity across decades of operation with minimal maintenance. Chinese HSR lines such as the Beijing–Shanghai and Guangzhou–Shenzhen corridors rely on thousands of such units.
Urban metro systems demand transformers that are compact, fire-safe, and low-noise — making dry type the only viable choice for underground installations. Applications include: main traction power substations (33kV/1500V DC or 11kV/750V DC), auxiliary power supply for ventilation, lighting and escalators, and onboard auxiliary transformers within rolling stock. Metro systems in cities such as Beijing, Shanghai, Dubai, Jakarta, and Riyadh have standardized on cast-resin dry type transformers for their underground infrastructure.
Light rail and tram networks typically operate at lower traction voltages (750V DC or 600V DC), requiring step-down transformers at rectifier substations. The smaller physical scale of LRT infrastructure means dry type transformers of 500kVA–2000kVA ratings are commonly deployed in trackside equipment rooms, often adjacent to residential or commercial areas — where oil-free, low-noise transformers are mandated by local regulations.
As governments globally push to decarbonize freight transport, mainline freight electrification projects are accelerating. Heavy freight corridors require robust traction transformers capable of supporting long-haul operations with high-current, high-voltage demands. Dry type transformers with IP54 or higher enclosures are increasingly selected for outdoor freight substation installations due to their resilience to dust, moisture, and industrial environments.
Modern EMUs (Electric Multiple Units) and high-speed trains incorporate onboard dry type auxiliary transformers to power passenger amenities, HVAC systems, lighting, and control electronics. These transformers must be extremely lightweight, vibration-resistant, and capable of operating in confined spaces subject to constant mechanical stress. Cast-coil dry type transformers are the technology of choice for this demanding onboard application.
Railway traction substations employ ring network cabinets and high-voltage switchgear as part of their medium-voltage distribution architecture. Current transformers (CTs) and voltage transformers (VTs) integrated within these ring network systems provide accurate metering and protection relay inputs, ensuring fault detection and supply continuity. Precision dry type instrument transformers — such as the LZW32-10 and LMZ1 series — are essential components within these protection and metering circuits.
🏆 Industry Insight: IEC 60076-11 governs the design and testing of dry-type power transformers for railway use, with specific requirements for partial discharge levels, thermal classification, and fire behavior — all benchmarks that our product range meets or exceeds.
Next-generation dry type transformers are being designed to EU Ecodesign Regulation (EU) 548/2014 Tier 2 and IEC 62631 standards, minimizing no-load losses and using halogen-free insulation to reduce lifecycle environmental impact across electrified rail networks.
🌱Embedded temperature sensors, partial discharge monitors, and IoT-connected diagnostic modules are being integrated into traction transformers, enabling predictive maintenance and real-time health monitoring via cloud platforms — reducing unplanned outages in critical rail infrastructure.
📡Advanced silicon steel and amorphous metal cores are enabling higher power densities in smaller transformer footprints, supporting the space-constrained installations demanded by modern metro rolling stock and compact urban traction substations.
⚡As metro systems integrate onboard and wayside energy storage (regenerative braking recovery), dry type transformers are being redesigned to interface with DC bus architectures and bidirectional power converters, supporting energy recovery of up to 30% in modern metro systems.
🔋China's Belt and Road Initiative continues to drive massive rail infrastructure exports across Africa, Southeast Asia, and Central Asia. Chinese dry type transformer manufacturers are scaling production to meet international project specifications, with IEC, CE, and CBIP certifications becoming standard exports.
🌐Modular, factory-assembled traction substations — incorporating dry type transformers, switchgear, rectifiers, and control systems in pre-engineered enclosures — are accelerating rail deployment timelines and reducing on-site construction costs by up to 40% compared to conventional civil-built substations.
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State-owned credibility as the foundation of every partnership and product delivery.
Continuously advancing product technology to meet evolving global railway power standards.
Long-term win-win cooperation with central SOEs, global contractors, and rail operators.
Committed to green electrical solutions that support the world's transition to clean rail transport.
Yueqing Suian Electric Co., Ltd. is a wholly state-owned trading company controlled by Yueqing Liushi Urban and Rural Construction Investment Co., Ltd., with a registered capital of 10 million yuan. It has been deeply involved in the field of electrical product trading. With its solid state-owned background, rich experience in serving central enterprises, and the leading electrical industry ecosystem and location empowerment in China, it is committed to pioneering a new pattern of global electrical trade with the responsibility of a state-owned enterprise, becoming a core partner of the electrical supply chain trusted by global customers, and providing high-standard and reliable electrical products and solutions for overseas markets.
Liushi Town, known as "Zhejiang's No. 1 Industrial Strong Town," achieved a total industrial output value of 106.76 billion yuan in 2024, exceeding 100 billion yuan for two consecutive years and firmly ranking first in Zhejiang Province among the top 1,000 towns in China in terms of comprehensive strength. As a wholly state-owned enterprise, the company, backed by the state-owned capital of the Liushi Town Government, naturally possesses core advantages such as strong financial strength, compliant operation, and strong risk resistance.
The company has accumulated extensive cooperative experience in the domestic market, successfully serving numerous leading central enterprises, including China Construction Eighth Engineering Bureau, China Construction Science & Industry Group Co., Ltd., China Construction Second Engineering Bureau, and Sinopec. It has accumulated rich project experience in infrastructure engineering, energy and power, and other fields. Its products and services have passed the stringent standards of central enterprises and possess mature capabilities suitable for large-scale projects and complex scenarios.
Based in Liushi, Yueqing — known as the "Electrical Capital of China" and "Export Base of Low-Voltage Electrical Appliances in China" — the company focuses on core trade in the electrical field. It mainly deals in over 200 series and 25,000 models of products, including transformers, high and low voltage electrical equipment, complete sets of electrical equipment, wires and cables, and new energy electrical products.
Adhering to the core principles of "integrity as the foundation, compliance as the basis, and win-win cooperation as the way," the company builds a solid foundation for cooperation with the credibility of a state-owned enterprise, ensures product quality with the service experience of a central enterprise, and connects overseas markets with professional services — committed to becoming a trustworthy international electrical trading partner.
Backed by government capital support from Liushi Town People's Government, we possess robust financial strength, standardized compliant operations, and strong risk resilience capabilities that ensure business stability and reliability.
Extensive collaboration with industry-leading central state-owned enterprises including China Construction Eighth Engineering Division, China State Construction Engineering Corporation, and Sinopec, demonstrating our capability to meet the most stringent quality standards.
Direct access to over 25,000 product models across 200+ series through our strategic position in China's electrical industry hub, ensuring diverse product selection, competitive pricing, and reliable supply continuity.
Products and services meet international standards and certifications, making us ideally positioned for Belt and Road Initiative projects and overseas infrastructure development requiring reliable electrical solutions.
Our production and testing facilities ensure every dry type transformer meets the rigorous quality, safety, and performance standards demanded by global railway and traction power projects.
Explore our comprehensive portfolio of transformers, switchgear, and measurement instruments engineered for railway substations and traction power distribution systems.
