Furnace Transformers Built for Continuous Duty. Not Rated for It.
Induction and arc furnace transformers up to 30 MVA, 33 kV — designed for the extreme thermal, electrical, and mechanical demands of steel, metal, and ferro-alloy production where transformer failure means furnace downtime.
Product Overview
The Transformer the Furnace Depends On.
Furnace transformers operate in the harshest electrical environment in the industrial sector. Induction furnaces impose high-current low-voltage output with rapid load cycling. Arc furnaces add short-circuit stresses and asymmetric loading on top of continuous thermal duty. Standard power transformers are not built for this.
KLR Furnace Transformers are engineered specifically for induction and arc furnace duty. The winding and insulation system is designed for high current density at low secondary voltage. The mechanical structure is reinforced for repetitive short-circuit forces. The cooling system is sized for continuous operation at rated load — not the intermittent duty cycle of general industrial transformers.
Technical Specifications
- Up to 30 MVA Capacity range:
- Up to 33 kV (primary); low voltage secondary to specification Voltage class:
- Induction furnace transformers; arc furnace transformers Types:
- Low voltage, high current output — to furnace specification Secondary voltage:
- OLTC standard — on-load voltage control for precise power regulation during heat cycle Tap changer:
- OFAF (forced oil, forced air) — sized for continuous duty Cooling:
- Heavy-duty copper windings — reinforced for short-circuit withstand on repetitive basis Winding:
- Oil-impregnated, VPD-processed — enhanced for high electromagnetic stress Insulation:
- IS 2026, IEC 60076, IEC 61378 (converter transformers) Standards:
- Full routine tests; short-circuit withstand test available; all certificates issued at despatch Testing:
Key Features
✓ OFAF cooling system sized for rated output under production conditions, not nameplate intermittent duty Continuous duty thermal design
✓ winding geometry and clamping designed for repetitive fault forces without mechanical fatigue Short-circuit reinforced structure
✓ precise on-load voltage control for power regulation across the full heat cycle OLTC tap changer
✓ heavy copper secondary windings for low-voltage, high-current furnace bus supply High-current secondary design
✓ designed to the exact voltage and current specification of the furnace manufacturer Customisable secondary voltage
✓ transformer output characteristics matched to furnace power curve for maximum process efficiency Process-matched design
Applications
- Steel melting and refining plants — induction furnace duty
- Arc furnace steel plants — EAF transformer duty
- Induction heating and forging operations
- Ferro-alloy manufacturing facilities
- Non-ferrous smelting — aluminium, copper, zinc
- Ladle furnace and vacuum degassing units
- Foundries and metal processing plants
Why KLR for Furnace Transformers
✓ not an upsized standard transformer, every design parameter is set for the specific furnace application Purpose-engineered for furnace duty
✓ thermal design validates performance at rated load under production duty, not test conditions Continuous operation capability
✓ test credentials available for procurement teams requiring demonstrated fault withstand Short-circuit documentation
✓ close coordination with furnace OEM specifications to ensure compatible electrical characteristics Matched to furnace specification
✓ annual maintenance contracts and on-site service team available for steel and metal plant operators AMC and field service
Specify Your Furnace Transformer.
Share your furnace type (induction or arc), MVA rating, secondary voltage, and duty cycle — our engineering team will configure a transformer to your exact process requirements.