Furnace Transformers are developed for melting of induction and heating of induction for ferrous and non-ferrous metal.

Induction Furnace has coil structured from heavy copper tubing. it is developed and turned to the inverter circuit which applies a medium frequency (generally 500 Hz or 1000 Hz) voltage to the induction coil. The magnetic field offered by the induction coil induces eddy currents in the charge and heats it. Medium frequency is necessities to enhance the rate of heat generation.

• Indoor/ Outdoor Pad Mounted
• On Load / Off Load Transformer

Features Of Furnace Transformer

Technical Specifications

Type	Indoor/ Outdoor Pad Mounted
Duty	On Load / Off Load
Voltage Class	3.3, 6.6, 11, 22, 33 Kv or special class by customer
Vector Group	Dyn11, Dyn5, Dyn1 or other specified by customer
No. of phase	3 phases
Frequency	50/60 Hz
Tap Range	±10% in on load and ±7.5% in off load or other specified by customer.
Winding Material	Copper with multiple paper covering
Applicable Standards	IS-2026, IEC 60076
Painting	Epoxy, Polyurethane or specified by customer

Why weight and dimensions of induction furnace transformers are higher than conventional transformer?

• To achieve reduced current densities, more conductor cross-section areas are required, Hence core weight increases.
• To achieve reduced flux density, more core cross-section are is required, hence core weight increases.
• In a transformer, core weight and copper weight are inter dependent. Increase in conductor cross-section requires that core window is bigger resulting in the increase of core weight also. Similarly, an increase in core cross-section is achieved by increasing core dia. which increases mean Dias of winding and the lengths of their mean turn. This increases copper weight also, increase in core and copper weights increase the overall dimensions, increasing oil quantity, structural steel, etc.
• When an electrostatic shield is provided between the windings, more radial gap is required between the windings. This further increase core weight, copper weight, oil quantity and structural steel.