Furnace Transformer
Furnace transformers supply induction and electric arc furnaces, where the secondary current is very high, the load changes rapidly and short-circuit stresses are frequent. They are built with heavy windings, strong clamping and wide voltage regulation.
Specify the furnace type and rating, required secondary voltage steps and cooling, and the transformer is engineered for that duty.
Furnace Transformer specifications
| Specification | Value |
|---|---|
| Type | Oil Cooled Type |
| Rating | Up to 7.5 MVA |
| Voltage Class | Up to 33kV |
| Voltage Ratio | 0.400kV/0.600kV |
| Frequency | 50 Hz |
| Phase | 3 Phase |
| Cooling Type | ONAN/ONAF |
| Vector Group | As Required |
| Winding Material | Copper |
| Insulation Class | A |
| Tapping | Off Circuit Or On-Load Tap Changers for HV/LV Variation As Per customer's specification |
| Impedance | In Line With Applicable Standards/ customer's specification |
| Applicable Standard | IS, IEC, IEEE etc. |
Ratings shown are typical catalogue values. Final specification is confirmed per order.
What a furnace transformer must handle
Melt shops are hard on transformers. Arc furnaces draw rapidly fluctuating current and cause frequent short-circuit stresses; induction furnaces add harmonic currents from the converter. Furnace transformers therefore use heavy, well-clamped windings, generous cooling – often forced oil and water – and on-load tap changers for many voltage steps.
For a quotation, share the furnace type and rating, the converter or electrode arrangement, the secondary voltage steps, the cooling water available and the HV supply voltage. Feeder protection is usually through VCB panels; harmonic and power factor issues can be addressed with an APFC or RTPFC panel. See also our power transformers.
Where it is used
- Induction furnaces in foundries and steel plants
- Electric arc and ladle furnaces
- Ferro-alloy and submerged-arc furnaces
Furnace Transformer – FAQ
Can furnace transformers be built with on-load tap changers?
Yes. Wide tapping ranges with on-load tap changers are common so the furnace voltage can be adjusted during melting.
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