Heavy-duty oil-immersed rectifier transformers are engineered for reliable AC-to-DC power conversion, with a robust industrial light-gray steel enclosure, high-efficiency corrugated cooling fins, and a large oil tank for enhanced thermal stability. Built with eco-friendly, RoHS-compliant materials, including high-grade cold-rolled silicon steel cores and oxygen-free copper windings, these units minimize energy loss and harmonics while meeting IEC 60076 and GB/T 10228 standards. Rated up to 150 MVA (domestic) / 100 MVA (international) with voltage levels from 10kV to 35kV, they support custom winding configurations, voltage ratios, and enclosure designs to match your project needs. Designed for low maintenance and 24/7 continuous operation, these transformers require minimal upkeep and come with full after-sales support, making them ideal for industrial rectification, electrolysis, and power conversion applications worldwide.
As a leading special transformer solution, we provide a specialized power conversion system that transforms AC input into stable, low-ripple DC output—ideal for demanding industrial applications requiring reliable direct current supply.
Going beyond conventional designs, we offer advanced 6-phase and 12-phase configurations that effectively minimize harmonics, boost efficiency, and ensure ultra-stable DC power with minimal voltage fluctuation and electromagnetic interference. These multi-pulse setups reduce harmonic distortion on the power grid while delivering smooth, interference-free output.
These units are widely used across key industries, including electrochemical rectification, steel plant rolling mills, electrostatic precipitators, DC power supply systems, aluminum smelting, and various industrial rectification processes.
They are CE and ISO certified, with 100% factory-tested quality for safety and reliability. We offer competitive pricing without compromising performance, backed by a 12–18 month warranty, fast 2–3 month delivery, and global technical support. Custom solutions are available to meet your unique project requirements.
Product Features
• High-Quality Materials
Premium silicon steel iron core and high-purity oxygen-free copper windings for maximum conductivity and durability.
• Advanced Core Design
Unique silicon steel sheet stacking method that dramatically reduces no-load losses and operating noise.
• Stable DC Output
Extremely low ripple and minimal fluctuation/interference, ensuring clean and reliable DC power—especially with 6-phase and 12-phase designs that further mitigate harmonics.
• Superior Performance
Low losses, low noise, high efficiency, and small temperature rise for energy-saving and quiet operation.
• Multi-Phase Capability
In addition to conventional transformers, we produce 6-phase and 12-phase transformers optimized for smoother waveforms, reduced harmonic distortion, and higher power quality in rectifier systems.
• Robust & Reliable
Designed for continuous heavy-duty service with excellent thermal management and long service life.
These features make our transformers stand out for applications requiring stable, high-power DC conversion with minimal maintenance
Specifications & Parameters
Typical technical parameters – fully customizable to meet specific project needs:
| Category | Specification / Description |
| Ratings | Silicon Steel Transformers – Up to 100 MVA |
| Cooling Methods |
ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), OA |
| Insulating Fluid | Mineral oil to international specifications or Natural oil-based eco-friendly insulating liquid |
| Frequency | 50 Hz / 60 Hz |
| Polarity | As specified by customer |
| Primary Voltage | Up to 35 kV Class |
| Secondary Voltage | 170–860 V (custom voltages available on request) |
| Winding Material | High-quality copper |
| Impedance | In accordance with applicable standards (GB1094, IEC60076, etc.) |
| Phase Configurations | Standard single/3-phase, plus specialized 6-phase and 12-phase transformers for multi-pulse rectification and harmonic reduction. |
| All parameters align with rigorous industry standards, ensuring safe, efficient, and compliant operation applications. | |
Packaging, Warranty & Certifications Packaging：
Secure, export-standard wooden crates or sea-worthy packaging with protective measures against moisture, shock, and vibration during transportation. Custom packaging options available..
Warranty：
Standard 12–18 months warranty (extendable), covering manufacturing defects and performance issues under normal operation. Comprehensive after-sales technical support included.
Certifications & Testing：
Compliant with GB1094, IEC60076, and other relevant international standards. ISO-certified manufacturing processes ensure consistent quality and reliability.
