Our oil-immersed rectifier transformers feature a robust light gray (RAL 7035) steel casing with corrugated cooling fins, constructed with high-grade cold-rolled silicon steel cores and copper windings for reliable performance. Designed to convert AC to stable DC power, they support multi-pulse configurations to minimize harmonics, with rated capacities up to 150 MVA (domestic) / 100 MVA (international) and voltage levels from 10kV to 35kV, fully compliant with IEC 60076 and GB/T 10228 standards. These transformers deliver low noise, low partial discharge, and high overload capacity for continuous 24/7 industrial operation.
As a high-performance special transformer engineered for demanding industrial applications such as steel mill rolling mills, AC-AC frequency conversion systems, and DC motor power supply. As a robust transformer rectifier solution, this rectifier transformer delivers reliable AC to DC power conversion, functioning effectively as a transformer rectifier unit (often referred to in the context of transformer rectifier machine definitions for industrial rectification processes).
Featuring a multi-winding configuration, elevated short-circuit impedance for enhanced fault tolerance, and support for flexible “one transformer multiple machines” operation, this transformer rectifier ensures stable, safe, and efficient power delivery even under heavy loads and harmonic stresses typical in metallurgical environments. Built with superior oil-immersed cooling for low loss, reduced noise, and compact design, it minimizes energy consumption while maximizing reliability and longevity.
Our transformers and rectifiers are optimized for continuous operation in harsh conditions, providing precise voltage regulation and superior thermal performance. Custom specifications are available to meet your exact voltage, current, and pulse requirements, making this rectifier transformer the ideal choice for electrochemical processes, variable speed drives, and heavy-duty DC applications.
Whether you need a complete transformer rectifier unit or a dedicated special transformer for rectifier duty, our solutions combine advanced engineering with proven durability to support uninterrupted production and lower total ownership costs. Contact us today for tailored rectifier transformer solutions that power your success.
Functional Design for Industrial DC and AC-DC Drive Systems
The Oil Immersed Rectifier Transformer is engineered specifically for industrial clients requiring stable direct current supply, particularly steel mills operating DC motors and AC-DC drives. As an advanced transformer rectifier unit, it supports demanding workloads, delivering reliable power conversion and allowing process engineers and system integrators to maintain operational continuity. By serving specific power needs with high-voltage inputs converted efficiently to DC output, this product from reputable rectifier transformer manufacturers addresses critical performance demands in metallurgical and heavy machinery environments.
Advanced Technical Architecture and Specifications
This rectifier transformer features a compact three-phase three-limb core structure using cold-rolled grain-oriented silicon steel and high-conductivity copper windings. The oil-immersed design with ONAN cooling guarantees superior thermal management and insulation properties, critical for high-load applications. Multi-group low voltage windings with custom configurations offer flexibility with high short-circuit impedance for fault tolerance. Its rated capacity ranges extensively, from 500 kVA up to over 100,000 kVA, meeting various project specifications. Compliance with IEC 60076 and GB/T standards ensures international usability and quality assurance.
Industry Applications Enhancing Steel Manufacturing and Power Systems
Primarily deployed in steel mill DC motor drives and AC-DC variable frequency drive systems, this high voltage rectifier transformer facilitates stable, clean DC power essential for rolling mills, electrochemical processing, and harmonic mitigation. It is engineered to integrate seamlessly into existing power distribution networks, supporting multipulse rectification and complex wiring configurations. End users benefit from minimizing downtime while improving efficiency in harsh industrial environments where robust insulation and cooling substantially extend equipment lifecycle and reliability.
Innovative Structural and System Design
The transformer's oil-immersed design with mineral oil and ONAN cooling reflects methodical engineering by leading transformer rectifier manufacturers ensuring robust insulation and natural convection cooling. Its modular three-phase three-limb core minimizes footprint and enhances spatial integration into compact switchgear systems. Multi-group low voltage windings support both independent and parallel operation modes, adding operational flexibility uncommon in standard rectifier transformer suppliers. High short-circuit impedance protects multi-output stability, a crucial factor in complex industrial rectifier setups requiring fault resilience and reliability.
High Performance and Operational Efficiency
Built with premium copper windings and cold-rolled silicon steel cores, this transformer rectifier unit excels under continuous, heavy-duty operation. The product offers stable voltage regulation and high overload tolerance critical for fluctuating load profiles typical in steel mill environments. Its customized tapping range and winding configurations ensure tailored solutions that optimize power quality and system efficiency. End users benefit from enhanced reliability, reduced energy losses, and easier maintenance due to the proven durability and compliance with international electrical standards.
Specifications & Parameters
Specifications are customizable to meet exact project needs. Typical technical parameters for our oil immersed rectifier transformer include:
| Category | Specification / Description |
| Rated Capacity | 500 kVA ~ 100,000 kVA (or higher upon request) |
| Input Frequency |
50 Hz or 60 Hz |
| Primary Voltage | 6 kV / 10 kV / 35 kV (Other grid voltages available). |
| Phase | Three-Phase (Standard for industrial power). |
| Secondary Voltage | Multiple windings, e.g., 400 V ~ 1000 V or custom for rectification. |
| Core Structure | Three-limb core with high-quality cold-rolled grain-oriented silicon steel |
| Winding Material | High-conductivity copper |
| Short-Circuit Impedance | Higher impedance between LV groups (typically 6% ~ 10% or customized) for enhanced stability |
| Cooling Method | ONAN (Oil Natural Air Natural); ONAF optional |
| Temperature Rise | Winding ≤ 65 K, Oil ≤ 60 K (standard) |
| Vector Group | Dyn11, YNd11, or multi-winding custom configurations (including phase-shifting for multi-pulse rectification) |
| Tapping range | ±2 × 2.5% or ±5% (off-load tap changer) |
| Insulation Level | According to IEC 60076 / GB/T 1094 standards |
| Overload Capability | Strong overload tolerance suitable for rectifier and drive loads |
| Additional Options | Multiple secondary windings (2+ groups), high short-circuit withstand, low partial discharge, and custom pulse configurations (6/12/24 pulse compatible) |
| Parameters such as no-load loss, load loss, and efficiency comply with or exceed GB/T 6451 and international standards for energy-efficient performance. Exact values are provided based on customer voltage, capacity, and duty cycle requirements. | |
Packaging, Warranty & Certifications Packaging：
Robust wooden crate or seaworthy export packaging with moisture-proof and shock-absorbing measures. Oil is drained or sealed during transport for safety; detailed installation, operation, and maintenance manuals included.
Warranty：
Standard 18 months from delivery or 12 months from commissioning (whichever comes first). Extended warranty options available upon request.
Certifications & Testing：
ISO 9001 Quality Management System, IEC 60076 / GB/T 1094 compliance, type test reports, and factory test certificates. Additional certifications such as CE, UL, or specific industry approvals (e.g., for metallurgical applications) can be arranged. Products meet national energy efficiency standards and environmental requirements for safe, reliable industrial use.
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.
