Furnace Transformer Manufacturer & Supplier in India

Heavy-Duty Furnace Duty Transformers up to 5000 KVA — Built for Arc Furnaces, Induction Furnaces & Steel Plants

What Is a Furnace Transformer?

A Furnace Transformer is a heavy-duty, specially designed power transformer used to supply controlled electrical power to electric arc furnaces (EAF), induction furnaces, ladle furnaces, and resistance heating furnaces in steel plants, foundries, and metallurgical industries. Unlike standard power or distribution transformers is engineered to endure extreme electrical, thermal, and mechanical stresses — including frequent short-circuit conditions, high secondary currents, rapid load fluctuations, and continuous high-temperature operation.

Tirupati Transformers Pvt. Ltd. is a leading Transformer manufacturer in India, supplying high-performance furnace duty transformers from its modern manufacturing facility in Greater Noida, Delhi NCR. Our transformers are built to deliver consistent, reliable performance in the most demanding industrial environments.

India’s steel and metal industry is one of the largest consumers of  transformers. According to the Ministry of Steel, Government of India, India is the world’s second-largest steel producer — making robust  Transformer supply a critical requirement for the sector’s continued growth.

For high-power industrial applications, also explore our Power Transformer and Converter Duty Transformer range.

Why Furnace Transformers Are Different from Standard Transformers

A Furnace Transformer operates in conditions that would damage or destroy a conventional distribution or power transformer. Understanding these differences is essential when selecting the right equipment for your plant.

Designed for Continuous Short-Circuit Conditions

Electric arc furnaces operate with extremely high secondary currents and frequent short-circuit events during the melting process. A Transformer is built with reinforced windings, special clamping structures, and high short-circuit impedance to withstand these conditions without failure — cycle after cycle, shift after shift.

Wide Voltage Regulation Range

Furnace processes require precise control of electrode voltage to manage arc stability and melting efficiency. These units are equipped with on-load tap changers (OLTC) that allow operators to adjust the secondary voltage in fine steps — maintaining optimal arc conditions throughout the heat cycle.

High Secondary Current Capacity

Arc furnaces draw extremely high secondary currents — often in the range of tens of thousands of amperes at low voltage. Furnace are designed with low-impedance, high-current secondary windings and robust bushing arrangements to handle these demanding current levels.

Superior Thermal Management

Continuous furnace operation generates significant heat. Our Furnace Transformers use Oil Natural Air Natural (ONAN) or Oil Natural Air Forced (ONAF) cooling systems, with thermally upgraded insulation materials to maintain safe operating temperatures even under prolonged maximum-load conditions.

Tirupati Transformers — Leading Furnace Transformer Manufacturer in India

With decades of experience in manufacturing industrial transformers, Tirupati Transformers has built deep expertise in Furnace design and production. We serve steel plants, ferroalloy producers, foundries, and non-ferrous metal processing units across India.

Advanced Manufacturing Technology

Every Furnace Transformer we manufacture is built using precision copper windings, high-grade grain-oriented silicon steel (CRGO) cores, and thermally upgraded insulation systems. Our manufacturing processes comply with Bureau of Indian Standards (BIS) requirements and international standards, ensuring every unit meets the performance demands of heavy industrial furnace applications.

Full Customization for Your Furnace Type

No two furnace installations are identical. Our engineering team designs each Transformer based on your specific furnace type, capacity, secondary voltage requirements, tap changer configuration, and site conditions. We manufacture transformers for:

• Electric Arc Furnaces (EAF) — steel melting and refining
• Induction Furnaces — steel, cast iron, copper, and aluminium melting
• Ladle Furnaces (LF) — steel secondary metallurgy and refining
• Submerged Arc Furnaces (SAF) — ferroalloy and silicon production
• Resistance Furnaces — heat treatment and annealing

In-House Testing Before Dispatch

Every units undergoes comprehensive factory acceptance testing (FAT) before dispatch, including winding resistance measurement, turns ratio and vector group verification, insulation resistance test, induced overvoltage test, and load loss measurement — in compliance with IS 2026 and IEC 60076 standards.

Our Electrical Turnkey Projects team can also handle complete furnace transformer installation, testing, and commissioning at your site.

Key Features of Our Furnace Transformers

Heavy-Duty Copper Windings

All primary and secondary windings are manufactured using high-conductivity electrolytic copper — ensuring minimum losses, maximum current carrying capacity, and long operational life even under continuous high-load furnace conditions.

On-Load Tap Changer (OLTC) for Precise Voltage Control

Our models are equipped with motor-operated on-load tap changers, enabling fine voltage adjustment without interrupting the furnace power supply. This is critical for maintaining arc stability and optimizing energy consumption during the melting cycle.

High Short-Circuit Withstand Strength

The winding clamping system and coil design of every Transformer are engineered to withstand the high electromagnetic forces generated during short-circuit conditions — a routine occurrence in arc furnace operations that would damage a standard transformer within weeks.

Oil-Filled ONAN / ONAF Cooling

Standard cooling configurations include Oil Natural Air Natural (ONAN) cooling. For higher KVA ratings or more demanding duty cycles, Oil Natural Air Forced (ONAF) cooling with external radiators and cooling fans is available — ensuring reliable temperature management under continuous operation.

Skid-Mounted for Easy Installation

All units are supplied on robust steel skids, making them easy to transport, position, and install within your furnace bay — reducing installation time and site preparation costs.

HV Cable Box and Accessories

Standard and optional fittings include oil level gauges, temperature indicators, pressure relief devices, Buchholz relays, and HV cable boxes — all factory-fitted and tested before dispatch.

Applications of Furnace Transformers

Our SAF-duty units are designed and supplied for a wide range of high-temperature industrial processes across India:

Steel Plants and Mini Steel Mills

The primary application of a Transformer is in electric arc furnace (EAF) based steel melting shops — including integrated steel plants, mini steel mills, and secondary steel producers. The transformer steps down 11 KV or 33 KV supply voltage to the low secondary voltage required by the arc furnace electrodes.

Induction Furnace Units

Induction furnaces for melting steel, cast iron, copper, brass, and aluminium require specially designed medium-frequency or power-frequency transformers. Our units are optimized for induction furnace duty cycles with variable load and frequent starts.

Ferro Alloy and Silicon Plants

Submerged arc furnaces (SAF) used in ferroalloy, silicon carbide, and phosphorus production operate at very high secondary currents and low voltages. Our Transformers for SAF duty are designed with multiple secondary voltage taps and robust bushing arrangements to handle these demanding conditions reliably.

Non-Ferrous Smelting — Copper, Aluminium, Zinc

Smelting and refining of copper, aluminium, zinc, and other non-ferrous metals requires high-capacity transformers capable of sustained operation at elevated ambient temperatures typical of smelting environments.

Heat Treatment Furnaces

Resistance furnaces used for annealing, normalizing, hardening, and other heat treatment processes use transformers to supply stable, controllable low-voltage power to heating elements.

As per the Central Electricity Authority (CEA), industrial furnace loads represent a significant portion of India’s total industrial electricity consumption — making transformer reliability and efficiency a key concern for plant managers.

Frequently Asked Questions — Furnace Transformer

What is the difference between a Furnace Transformer and a Power Transformer?

This transformer type is specifically engineered for the harsh operating conditions of industrial furnaces — frequent short circuits, high secondary currents, wide voltage regulation, and continuous thermal stress. A standard power transformer is designed for stable load conditions and would fail rapidly in furnace duty service. Key differences include reinforced windings, higher short-circuit impedance, OLTC for continuous voltage adjustment, and robust clamping structures.

What KVA range is available for Furnace Transformers from Tirupati?

We manufacture units up to 5000 KVA, with primary voltage of 11 KV or 33 KV. Secondary voltage is customized to match your specific furnace electrode voltage requirements. Contact our engineering team for requirements outside this standard range.

Can a Furnace Transformer handle short-circuit conditions during arc furnace operation?

Yes. Our Transformers are specifically designed and tested to withstand the repeated short-circuit conditions that occur naturally during the arc ignition and melting phases of electric arc furnace operation. This is achieved through reinforced winding clamping, optimized impedance design, and robust mechanical construction — verified through factory short-circuit withstand testing per IS 2026 / IEC 60076.

What type of cooling is used in Furnace Transformers?

Standard cooling configurations include Oil Natural Air Natural (ONAN) cooling. For higher duty applications or larger KVA ratings, Oil Natural Air Forced (ONAF) cooling with forced-air radiators is available. The cooling system is selected based on your furnace duty cycle, ambient temperature, and installation space.

Do you supply Furnace Transformers with on-load tap changers?

Yes. All models are available with motor-operated on-load tap changers (OLTC), enabling continuous voltage adjustment under load — essential for maintaining arc stability and optimizing power input during the melting cycle.

What is your delivery timeline for a Furnace Transformer?

Standard delivery for all units we supply is typically 8 to 14 weeks from order confirmation, depending on KVA rating and customization requirements. Contact our sales team with your specifications for an accurate delivery schedule.

Do you provide installation and commissioning support for Furnace Transformers?

Yes. Our Electrical Turnkey Projects team provides complete site installation, oil filling, pre-commissioning testing, and energisation support for all units we supply — ensuring safe and reliable startup of your furnace installation.

Why Choose Tirupati Transformers for Furnace Duty Transformers

Specialized Furnace Transformer Expertise

Unlike general-purpose transformer manufacturers, Tirupati Transformers has deep, dedicated expertise in Transformer design and manufacturing — understanding the unique electrical, thermal, and mechanical demands of arc furnace, induction furnace, and submerged arc furnace applications.

IS 2026 and IEC 60076 Compliant Manufacturing

All transformers comply with IS 2026 (Indian Standard for Power Transformers) and IEC 60076 (International Standard for Power Transformers) — ensuring full statutory compliance and long-term operational reliability.

Competitive Pricing from Direct Manufacturer

As a direct manufacturer based in Greater Noida, Delhi NCR, we eliminate distributor markups — offering competitive Transformer pricing without compromising on materials, windings, insulation, or testing quality.

Pan-India Supply and Service Network

we supply these heavy-duty units to steel plants, foundries, and industrial facilities across India — with after-sales service support available for preventive maintenance, oil testing, and emergency repairs.

Get Your Furnace Transformer Today

Whether you are setting up a new electric arc furnace, replacing an ageing transformer, or expanding your steel melting capacity — Tirupati Transformers has the right Transformer Manufacturer & Supplier for your requirement. Get a Quote for Your Furnace Application

• Best quality products at nominal prices.
• Strong and well equipped.
• Available with low maintenance costs.
• Protected from voltage fluctuations.
• Operating effectively and efficiently.
• It is customized according to customer’s need.