DC furnace transformers are also used to melt scrap metal (steel). Three-phase is the most common design. Since direct current is the melting process the transformer is installed in combination with a rectifier, which feeds the furnace.
Examples on furnace transformers for special purposes can be for production of electrode material & electro slag refining, where the latter is production of very high quality steel.
AC furnace transformers are made both as single- & three-phase. In many installations around the world, furnace transformers have been designed as shell type. All other transformers for this
purpose are made as core type. Manufacturing of new AC furnace transformer are made as core type with a few exceptions.
Reduction furnaces are also used in the production of calcium carbide. The most common design for reduction furnace transformers is single phase.
Reduction furnace transformers are mainly used in the metallurgical industry. Production of ferroalloys is an important application. The major alloys are Ferro-silicon, silicon metal & ferro-manganese. Other significant alloys are Ferro-nickel & Ferro-chrome. Reduction furnaces are also used in the production of non ferrous metals such as copper, nickel, tin, lead & zinc.
ARC furnace transformers are used for melting scrap metal. Usually in combination with an arc furnace, there is a ladle furnace is used in the process of refining the metal melted by the arc furnace. Arc furnace transformers are normally designed as tree phase units.
DC Furnaces
Furnaces for special purposes
Reduction furnaces
Arc furnaces
AC Furnaces
Transformers of this type are used in the steel melting & metallurgical industry. They are characterized by high secondary current, & for steel up to 90 KA & for ferroalloy up to 160 ka electrode current, & a wide secondary voltage range. The secondary voltage is normally regulated by an on-load tab changer (OLTC) located in the high voltage winding or in an intermediate circuit of a two-core design (booster regulation) within the transformer tank. Furnace transformers have secondary voltages up to 1500 v. Furnaces can roughly be divided into two groups: |
ARC furnace transformers are used for melting scrap metal. Usually in combination with an arc furnace, there is a ladle furnace
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