A furnace transformer is a heavy-duty transformer that feeds the rectifier and inverter panel of an induction furnace, which melts metal with medium-frequency power, typically 500 or 1,000 Hz. It is built for high currents and the frequent short circuits that occur during melting.
What it is: Heavy-duty transformer feeding medium-frequency induction furnace panels, 25 kVA to 500 kVA, built for high currents and frequent short circuits during melting.
Best suited for: Steel melting shops, foundries and alloy plants.
Rated for the high currents and frequent short circuits of melting duty.
Matched to the furnace panel maker’s input requirement.
ONAN oil cooled, copper wound, with off-circuit taps.
Insulation class H or E, rated 180 °C or 220 °C.
Designed to IS 2026.
| Parameter | Furnace Transformer |
|---|---|
| Rating | 25 kVA to 500 kVA |
| Secondary voltage | As per furnace panel |
| Design | Induction furnace duty, for medium-frequency (500 or 1,000 Hz) panels |
| Cooling | ONAN |
| Insulation | Class H or E, rated 180 °C or 220 °C |
| Winding | Copper |
| Voltage regulation | Off-circuit taps |
| Duty | Heavy duty: high currents and frequent short circuits during melting |
| Standards | IS 2026 |
Off-circuit tap switch, Buchholz relay, oil and winding temperature indicators, cable box or bushings, and marshalling box are available as options. GA drawings, rating plate drawings and guaranteed technical particulars (GTP) are available on request.
Supply for an induction furnace
Steel plants and foundries: induction furnace supply
Induction melting in alloy plants
Our application engineers can size the unit for your load and supply. We also make servo voltage stabilizers, industrial rectifiers, chemical earthing electrodes for transformer neutral and body earthing, and lightning arresters for the substation.
More questions are answered on the transformers page, which covers kVA sizing, losses, testing and how to compare transformer manufacturers.
| Product | What it is | Best suited for |
|---|---|---|
| Distribution Transformer | Three phase, oil cooled (ONAN), 11/0.433 kV, 22/0.433 kV or 33/0.433 kV, 25 kVA to 500 kVA, step-lap CRGO core, copper wound | Utility-supplied factories, commercial buildings, housing, solar and pumping |
| HT AVR Transformer | Copper-wound “two-in-one” HT stabilizer and transformer for 11, 22 or 33 kV, holding the LT output within ±1%, for indoor or outdoor installation, 500 kVA to 10 MVA | Industrial plants on unstable HT supply, hospitals, data centres, process lines |
| LT Step-Down Transformer | 415 V down to 230 V, 110 V or as specified, 25 kVA to 2500 kVA, dry type or oil cooled | Lighting, controls, imported equipment, separate LT circuits |
| LT Step-Up Transformer | 415 V up to 690 V or as specified, 25 kVA to 2500 kVA | Motors and machines rated above 415 V, long LT cable runs |
| Dry Type Transformer | Three phase, ventilated, cast resin or VPI, 11 kV or 33 kV class, 25 kVA to 500 kVA, oil-free and fire-safe | Indoor substations, high-rise buildings, hospitals, malls, metro and data centres where oil is a fire risk |
Send your kVA rating, HT and LT voltages, vector group and site location. Our engineers will reply with a techno-commercial offer, guaranteed losses, a GA drawing and the delivery schedule.