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Furnace Transformer

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Furnace Transformer Product Details:


Furnace transformers are separated with normal power transformer with its characteristic of massive secondary currents.  As an example a 30 MVA unit at 150 V would result in a secondary current of 115 kilo Ampere. For these high secondary currents special bushings are required to connect to the bus-bars. These bushings are specified with very specific arrangements to suit the bus-bar arrangement and cooling system.  Furnace bus-bars are mostly water cooled. The coolers are either of the Oil Forced Air Forced (OFAF) or Oil Forced Water Forced (OFWF). 


CTSS is renowned and appreciated by its reliable products performance and integrated services. 



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Ø  IEC-76 .2-1993 Power Transformers: Temperature Rise

Ø  IEC-60076-3: 2000 Power Transformers Insulation Levels, Dielectric Tests And External Clearances In Air

Ø  IEC60076-4-2002 Power Transformers Part4 Guide To The Lighting Impulse And Switching Impulse Testing-Power Transformers And Reactors

Ø  IEC-60076-5:2000 Power Transformers Ability To Withstand Short Circuit

Ø  IEC 60214 On-Load Tap-Changers


Ø  Low loss

Ø  Low noise

Ø  High efficiency

Ø  Low partial discharge

Ø  Strong mechanical strength and short-circuit withstand ability

Ø  Operation reliability

Ø  Easy maintenance

Ø  Pretty outline and compact structure

Ø  100% guaranteed no leakage


Brief specification:

Ø  Voltage class: 33kV to 110kV

Ø  Capacity: 3000120000kVA

Ø  Short circuit impedance: 6.5-10.5%

Ø  No load current: 0.3~1.2%

Ø  Losses: no-load losses is fully comply with IEC standard requirements


Typical specification:

Ø  Type: Three Phases, OLTC, Electric Arc Furnace Transformer

Ø  Rated voltage:35kV

Ø  Rated Capacity:5000kVA

Ø  Connections: delta/open delta (y) 

Ø  Type of Cooling: OFWF


Application: Arc furnaces are used in steel industry for smelting scrap iron and for refining steel. Other application areas are:

Ø  Smelting glass and ceramics

Ø  Manufacturing or refining many other materials, e.g. ferrochromium, ferromanganese, different abrasive materials (oxides and nitrides), semiconducting base materials, nanopowders etc.

Ø  Electric arc furnace (EAF) transformers are required for many different furnace processes and applications. They are built for:

²  Steel furnaces, mainly long arc

² Ladle furnaces

²Ferro-alloy furnaces and similar with short or submerged arc

²Smelting of other materials

 CTSS can provide EAF furnace transformer with 120MVA capacity on 35kv ratio.

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