Capacity: upto 12.5 MVA of voltage class up to 33 kV
Makpower’s Rectifier Duty Transformers (RDTs) are engineered to meet the specific demands of DC-driven industrial systems. Designed for continuous operation and high-current applications, these transformers are vital for rectifier installations, electrochemical processes, and metallurgical operations. They ensure consistent DC output from AC sources with superior reliability and thermal stability.
Range: Makpower manufactures Rectifier Transformers in 3-phase units up to 12.5 MVA, 33 kV voltage class. For higher capacity demands, banks of three single-phase transformers are deployed. These units are widely used in Submerged Arc Furnace (SAF) applications, offering performance scalability and phase flexibility for large power-intensive processes.
Capacity Range: Up to 12.5 MVA in 3-phase systems, higher via single-phase banks
Voltage Class: Designed for systems up to 33 kV
Rectifier Compatibility: Works with 6-pulse, 12-pulse, and higher pulse configurations
Cooling Type: Available in ONAN, ONAF, and customized cooling variants
Insulation Class: Designed to withstand elevated temperatures and harmonic stress
Harmonic Management: Optimized winding design for harmonic-rich load handling
Makpower provides both three-phase and banked single-phase RDTs to meet different process and installation requirements:
Built in a single tank, combining primary, secondary, and tertiary windings with options for OLTC and isolation features.
For capacities beyond 12.5 MVA, three identical single-phase units are used. Each unit may be equipped with OLTC and custom tap arrangements for precise voltage control.
Customized designs with inter-phase transformers or phase-shifting to support 12, 24, or higher pulse converter systems.
Low Ripple DC Output: Designed to supply smooth and stable rectified current
Enhanced Dielectric Strength: Suitable for high surge and non-linear load environments
Thermal Stability: Performs reliably under continuous heat and load cycles
Durability: Built for industrial-grade duty with long operational life
Custom Engineering: Tailored winding connections for exact voltage and current needs
Submerged Arc Furnaces (SAF): Used in ferroalloy and metal refining industries
Electrolysis Plants: Ideal for aluminum, zinc, copper, and chlorine production
Traction Systems: Converts AC power to regulated DC for electric railways
Battery Charging Stations: Large-scale DC output for heavy-duty industrial charging
Electroplating & Chemical Plants: Powers DC-sensitive operations with high precision
Standard Compliance: Adheres to IS, IEC, ANSI, and customer-specific standards
Proven Reliability: Successfully installed across major steel and chemical industries
Harmonic Tested: Built to operate under non-sinusoidal voltage and current loads
Insulation System: Class F or H insulation based on environmental and duty parameters
Engineering Support: Our design team collaborates to meet application-specific needs
Installation Assistance: Field engineers ensure correct commissioning and performance testing
AMC & After-Sales: Annual maintenance contracts and 24/7 support availability
Failure Analysis: Expert service team available for diagnostic and repair services
A Rectifier Duty Transformer converts AC supply into a regulated AC output, which is then rectified to DC. It is designed for applications like electrolysis, furnace heating, and DC traction systems.
Unlike standard transformers, RDTs are designed to handle non-linear loads, high ripple current, and harmonics. They also provide better insulation, thermal management, and voltage control for DC conversion.
Makpower’s Rectifier Duty Transformers support 6-pulse, 12-pulse, 24-pulse, and higher setups, using phase-shifted windings and interphase transformers to reduce harmonic distortion.
