Discover our premium oil immersed rectifier transformer, 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.
Product Features
Our oil immersed rectifier transformer(also known as rectifier transformer or transformer rectifier) is engineered for demanding industrial applications, particularly in steel plants for powering AC-AC variable frequency drives and rectified DC motors.
Key advantages include:
• Compact Three-Phase Three-Limb Core Structure
Each limb supports two or more sets of high and low voltage coils, significantly saving installation space while maintaining high performance.
• Flexible Operation Modes
Single unit independent operation or multiple units running in parallel, offering excellent configuration flexibility for various site requirements.
• Multi-Group Low Voltage Windings
Equipped with two or more low voltage coils that can operate independently or in parallel. High short-circuit impedance between coils ensures stable and safe multi-output performance.
• Versatile Wiring Options
Supports “one transformer to multiple machines” and “multiple machines to one transformer” connections, perfectly adapting to complex industrial conditions.
• Robust Oil-Immersed Design
Uses mineral oil for superior insulation and natural cooling (ONAN), delivering low loss, low noise, high overload capacity, and reliable long-term operation in harsh environments.
• Industrial-Grade Reliability
Ideal for heavy-duty applications like steel mill rolling mills, providing clean and stable power for DC motors after rectification or direct AC drive systems.
This rectifier transformer excels in harmonic management and voltage regulation, ensuring efficient AC to DC power conversion with minimal losses.
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.
