Oil Immersed Rectifier Transformer for Medium Frequency Induction Melting Furnace

This medium frequency furnace rectifier transformer is a robust oil immersed rectifier transformer, painted light grey with welded steel tank, conservator, high-voltage porcelain bushings and large external radiators for heat dissipation.
The core uses high-grade grain-oriented silicon steel sheets, paired with copper windings fully immersed in mineral insulating oil. As a high voltage rectifier transformer and special transformer, this complete transformer rectifier unit converts grid AC power into adjustable DC power to feed medium frequency induction melting furnaces.
As an experienced rectifier transformer manufacturer, we customize capacity, voltage class, impedance and cooling method to match different smelting loads.
It handles fluctuating furnace loads, restricts short-circuit current and suppresses grid harmonics. Our design reduces furnace downtime, improves melting efficiency and cuts long-term power consumption for foundries and metallurgical plants.
We provide cost-effective custom solutions without sacrificing reliability, making it a preferred choice for new foundry builds and old melting line retrofits.

Product Features


Stable power supply for medium frequency melting furnace
This oil immersed rectifier transformer supplies steady DC power for metal melting, casting and alloy smelting, maintaining consistent melting temperature and metal quality.

Excellent short-circuit withstand performance
As a heavy-duty high voltage rectifier transformer, it is engineered to endure frequent load surges and short-circuit risks common in induction furnace operations.

Effective harmonic suppression
Optimized multi-pulse winding design reduces harmonic distortion, protects your plant grid and other sensitive electrical equipment.

Customized engineering
As a professional rectifier transformer manufacturer, we tailor this transformer rectifier unit as a special transformer to your rated kVA, high voltage, low voltage and impedance requirements.

Durable oil-immersed construction
High-quality silicon steel core and copper windings, with ONAN / ONAF cooling options for continuous 24-hour operation in dusty foundry environments.

Lower overall operation cost
High power factor design reduces reactive power charges, minimizing electricity expenses for long time continuous smelting production.

Specifications & Parameters (Typical Range)

Packaging, Warranty & Certifications
 Packaging：
This oil immersed rectifier transformer is fully assembled and tested before shipment. The main tank is sealed and filled with dry nitrogen to protect insulation. The whole unit is fixed on heavy-duty steel skid for lifting and ocean shipping. Radiators, bushings, sensors and other loose accessories are packed separately in waterproof wooden crates. Test reports, drawings and operation manuals are enclosed.

 Warranty：
18 months warranty from shipment or 12 months after successful on-site commissioning, whichever comes first. The warranty covers manufacturing defects for our high voltage rectifier transformer, transformer rectifier unit and special transformer. Damage caused by improper installation, overload or mis-operation is excluded. Our team offers long-distance technical support.

 Certifications & Testing：
We are an ISO 9001 certified rectifier transformer manufacturer. Every oil immersed rectifier transformer is manufactured following GB and IEC standards. Each transformer undergoes complete routine tests including turns ratio, winding resistance, impedance, no-load loss, load loss and dielectric withstand tests. Temperature rise test and other special tests can be arranged upon request. Third-party inspection is acceptable.

Use Scenarios

Metal Melting & Foundry Production
This oil immersed rectifier transformer, a heavy-duty transformer rectifier unit, serves as the core power supply for medium frequency induction melting furnaces. As a reliable high voltage rectifier transformer and special transformer, it converts AC power into controlled DC power for steel, iron, copper and aluminum melting. Frequent load fluctuations are normal in melting workshops; our transformer withstands surge current, stabilizes power output and guarantees stable molten metal quality. Harmonic suppression protects other factory electrical equipment.

Alloy Smelting & Metallurgical Plants
Metallurgical plants for alloy production require robust power equipment. As a professional rectifier transformer manufacturer, our medium frequency furnace rectifier transformer runs continuously under heavy cyclic loads. Optimized power factor helps factories save reactive power cost, lowering monthly electricity bills.

Melting Line Upgrade & New Foundry Construction
Foundry owners building new workshops or upgrading outdated melting lines can get fully customized special transformer solutions. We adjust voltage, capacity and impedance to fit your rectifier cabinet and existing grid, balancing initial investment and long-term operational stability.