Oil Type Transformer for Furnace Melting System

Key Features

• Low-loss S11/S13 core design — significantly reduced no-load and load losses cut idle power consumption and lower electricity costs for continuous melting operation.
• Strong overload capacity — withstands up to 120% load for 2 hours, matching the frequent load shocks of melting and pouring cycles.
• High short-circuit withstand strength — reinforced winding and clamping structure handle voltage fluctuation and harmonic currents generated by thyristor / IGBT MF power supplies.
• Oil-immersed natural cooling (ONAN) — reliable heat dissipation, low noise, long service life, minimal maintenance.
• Complete oil preservation system — conservator, Buchholz (gas) relay, silica gel breather, oil temperature indicator and pressure relief valve protect the transformer under all operating conditions.
• Wide customization — capacity, voltage, impedance, vector group and accessories configurable to match your furnace power and local grid standard.
• Compliant with international standards — manufactured and tested per IEC 60076, GB/T 6451 and GB 20052 energy-efficiency requirements.

Designed for Medium Frequency Furnaces

A medium frequency induction furnace is not an ordinary load. During melting, power demand fluctuates sharply between cold charging, melt-down and holding stages, while the MF power supply injects significant harmonics back into the grid. A standard distribution transformer is not built for this duty.

Topyro's oil-immersed transformer is specially designed for this working pattern:

• Stronger insulation and winding design to withstand harmonic stress;
• Higher overload margin for repeated charge-to-charge cycles;
• Stable voltage regulation to protect the rectifier and inverter of the MF power supply;
• Robust tank and terminal design for factory-floor environments with dust, heat and vibration.

The result is stable melting power, fewer electrical failures, and longer service life for both the transformer and the medium frequency power supply.

Technical Specifications

Specifications shown are typical ranges. Final values are confirmed by our engineers based on your furnace power, grid voltage and local standards.

Standard Configuration & Optional Accessories

Standard:

• Oil conservator with oil level gauge
• Buchholz (gas) relay
• Silica gel breather
• Winding and oil temperature indicators
• Pressure relief valve
• No-load tap changer (±5%)
• Drain and sampling valves
• Nameplate, lifting lugs, grounding terminals

Optional:

• On-load tap changer
• Tropical / anti-corrosion treatment for coastal or humid regions
• IP54 enclosure, special painting, custom terminals
• Remote temperature monitoring / alarm contacts

Applications

• Power supply for medium frequency induction melting furnaces — steel, iron, copper, aluminum and alloys
• Induction heating, quenching and forging equipment
• Input transformers for thyristor and IGBT medium frequency power supplies
• Foundries, casting plants and metal recycling facilities
• Full melting line projects: pairs with Topyro medium frequency furnaces, closed cooling towers and ingot casting machines for a complete turnkey solution