Furnace Transformer for Induction, Arc and Submerged Arc Furnace Applications

Product Overview

This Daelim furnace transformer is engineered for induction furnace, arc furnace and submerged arc furnace applications. It is available in oil-cooled or dry type construction and is designed for high current at low voltage. The magnetic circuit uses CRGO M3 to M5 type lamination; the electric circuit uses electrolytic grade 99.9% pure copper with transposition in the LV coil for current sharing in parallel conductors. Dielectric circuits use electric grade press paper, boards and mineral oil. The design targets trouble-free performance during surges and frequent short circuits, with optimum utilization of active materials for compactness. Maximum voltage is 110 kV and maximum capacity is 160 MVA.

Key Features

• Designed for induction furnace, arc furnace and submerged arc furnace applications.
• Magnetic circuit: CRGO M3 to M5 type lamination.
• Transformer dry type or oil cooled.
• Electric circuit: electrolytic grade 99.9% pure copper with transposition in LV coil for current sharing in parallel conductors.
• Dielectric circuits: electric grade press paper, boards and mineral oil.
• Thermal circuit: adequate cooling ducts provided radially and axially for smooth internal oil flow; radiator cooling banks for natural air cooling (ONAN) and additional fans for ONAF cooling; high current transformers provided with OFW cooling.
• Designed for trouble-free performance during surges and frequent short circuits.
• High current at low voltage.
• Optimum utilization of active materials for compactness.

Applications

Daelim furnace transformers are applied across chemical, pharmaceuticals, steel, textile, engineering, plastic, cement, refineries, mining, captive power projects, hydro power projects, wind mill farms, construction houses, pharma, electrical, electronics, renewable energy and automobile industries.

Documented application case: a steel plant in Mexico contacted Daelim at the end of 2017 to replace a furnace transformer. In June 2018 the customer mailed furnace transformer drawings to the Daelim office in Beijing. In October 2018, at the customer’s invitation, Daelim’s business manager and an engineer traveled to Mexico for further technical solution discussions. The customer selected Daelim and ordered two oil furnace transformers: a 20 kV 6 MVA oil furnace transformer and a 20 kV 20 MVA furnace transformer. These units have operated safely for more than two years.

Technical Specifications

Why Choose This Product?

The furnace transformer is built around the electrical, magnetic, dielectric and thermal circuits that matter in furnace duty. CRGO M3–M5 lamination supports the magnetic circuit, while 99.9% pure copper with LV coil transposition supports current sharing in parallel conductors. Cooling is addressed through radial and axial ducts, ONAN radiator banks, ONAF fans and OFW cooling for high current transformers. The design is intended for surges and frequent short circuits, and the compact arrangement makes optimum use of active materials. With up to 110 kV and 160 MVA, it can be specified for demanding furnace power supply duties.

Manufacturer Recommendation

Daelim supports furnace transformer projects with a complete transformer solution based on specific needs. The Mexico steel plant case shows the working method: drawings shared in June 2018, technical solution discussions in Mexico in October 2018, and an order for two oil furnace transformers — 20 kV 6 MVA and 20 kV 20 MVA — which have operated safely for over two years. For buyers sourcing furnace transformers, this record demonstrates project-specific engineering discussion and long-term operating experience.

Sourcing Guide (FAQ)

What furnace types can this transformer be used for?

It is designed for induction furnace, arc furnace and submerged arc furnace applications.

What is the maximum voltage and capacity?

Maximum voltage is 110 kV and maximum capacity is 160 MVA.

What cooling options are available?

The transformer can be dry type or oil cooled. Cooling arrangements include ONAN natural air cooling with radiator cooling banks, ONAF cooling with additional fans, and OFW cooling for high current transformers. Adequate cooling ducts are provided radially and axially for smooth internal oil flow.

What materials are used in the magnetic and electric circuits?

The magnetic circuit uses CRGO M3 to M5 type lamination. The electric circuit uses electrolytic grade 99.9% pure copper with transposition in the LV coil for current sharing in parallel conductors. Dielectric circuits use electric grade press paper, boards and mineral oil.

Has this transformer been used in a real furnace project?

Yes. A steel plant in Mexico ordered a 20 kV 6 MVA oil furnace transformer and a 20 kV 20 MVA furnace transformer. The units have been operating safely for over two years.