Heavy‑duty oil‑immersed rectifier transformer with 24‑pulse topology reduces harmonic distortion. Equipped with on‑load tap‑changer, it converts AC to stable DC. Robust welded tank delivers reliable sealing. Ideal for electrolysis, metallurgy and green‑hydrogen production with stable performance & competitive pricing.
Our transformers and rectifiers share reliable long-term operation and cost advantages for heavy industrial sites.
24 pulse design, low harmonic pollution, meets strict grid power quality requirements.
On-load tap changer (OLTC), adjustable output voltage under continuous load.
Oil immersed cooling (ONAF), strong overload capacity, stable operation for 24h continuous
production.
Heavy-duty welded steel tank, anti-corrosion light grey coating, suitable for harsh industrial environment.
Compact integrated layout, with conservator, radiator, control cabinet and oil monitoring accessories.
Customizable winding material, voltage ratio and pulse configuration for different industrial processes.
We are direct manufacturer of this special transformer. Our vertical production chain cuts intermediate costs, bringing obvious price advantage compared with overseas brands. The whole production process follows strict quality inspection, long service life and low maintenance cost. Our transformers and rectifiers share mature production technology, widely used in green hydrogen production, non-ferrous metal electrolysis, chlor-alkali chemical and metallurgy industries. We support custom design according to client’s site requirements.
Specifications & Parameters
Specifications are customizable to meet exact project needs. Typical technical parameters for our oil immersed rectifier transformer include:
| Category | Specification / Description |
| Product Type | 24-Pulse On-Load Tap-Changing Oil Immersed Rectifier Transformer |
| Rated Capacity | 6500 kVA |
| Phase / Frequency | 3 Phase, 50Hz |
| HV Rated Voltage | 35000 V |
| Rectification Mode | 3-phase bridge rectification, 24 pulses |
| Vector Group | YNd0-d0y11 |
| Cooling Method | ONAF |
| Insulation Level | LI1200 AC85 / AC5 |
| Tank Material | Thick welded carbon steel, light grey anti-rust & anti-corrosion painting |
| Structure | Oil immersed, with conservator, radiator, OLTC control cabinet, oil level indicator, pressure relief device |
| Net Weight | 12970 kg |
| Oil Weight | 8390 kg |
| Transport Weight | 22830 kg |
| Total Weight | 27740 kg |
| Application | Green hydrogen production, electrolysis, metallurgy, chlor-alkali chemical industry |
Packaging, Warranty & Certifications Packaging：
The oil immersed rectifier transformer will be fixed and reinforced on steel base skid for sea freight shipment. Critical components including bushing, control cabinet and sensors are wrapped with waterproof plastic film and wooden protective case. We will do oil preservation and vacuum treatment before delivery, suitable for long-distance ocean transportation.
Warranty：
12 months warranty after commissioning or 18 months after shipment, whichever comes first. Lifetime technical consultation and spare parts support.
Certifications & Testing：
Manufactured in accordance with IEC 60076, GB/T 18494.1 standards. We can provide factory test reports, routine test certificates, material certificates. Custom third-party inspection service is available upon request.
Use Scenarios
Power Supply for Steel Mill DC Motor Drives
In steel manufacturing plants, the employment of DC motor drives demands consistent, high-quality DC power. The rectifier transformer supplies this power by converting high-voltage AC to stable DC current vital for controlling rolling mill motors and drive systems. Its robust mineral oil cooling and multi-winding configurations enable continuous operation under severe industrial conditions while adhering to IEC 60076 standards. Integration into existing motor control centers enhances overall plant reliability and permits scalability as production demands evolve.
Integration with AC-DC Variable Frequency Drive Systems in Metallurgical Applications
This transformer rectifier unit plays an essential role in AC-DC variable frequency drive systems supporting metallurgical processes, where precise speed and torque control are requisite. By providing clean and harmonic-minimized DC power through multi-pulse rectification compatibility, it ensures compliance with power quality regulations and reduces electromagnetic interference. The unit fits seamlessly within complex electrical panels, providing scalable power transformation solutions tailored for harsh environments typical of steel plant operation, boosting process efficiency and facilitating preventive maintenance schedules.
What materials are used in your Oil Immersed Rectifier Transformer?
Our rectifier transformer features high-conductivity copper windings and a core made of cold-rolled grain-oriented silicon steel. The robust mineral oil insulation and ONAN cooling system enhance durability and electrical performance under heavy industrial loads.
Can you customize the transformer specifications for specific industrial requirements?
Yes, we offer tailored options for rated capacity, primary and secondary voltages, winding configurations, and pulse compatibility to suit your project needs. As experienced rectifier transformer manufacturers, we ensure each unit matches your steel mill’s precise power demands.
How do you ensure the reliability of your transformer for steel mill DC motors?
We design our transformer with a compact three-phase core, multi-group low voltage windings, and high short-circuit impedance, all compliant with IEC 60076 and GB/T standards. These features secure stable operation and low losses, critical for demanding DC motor and AC-DC drive applications.
What support do you provide regarding installation and delivery times?
Typically, delivery ranges from 8 to 16 weeks depending on your customized transformer rectifier specifications. Our technical team offers guidance to ensure smooth installation and integration into your existing steel mill power system for optimal performance.
