Reactor

Air cored series & Shunt Reactor, Upto 10 MVA , Upto 33Kv, ONAN / AN
A variable transformer, reactor having a core combining at least two complete core elements with a common yoke; primary winding divided into two independently fed sets of phase coils wound in opposite direction, arranged on symmetrical legs of core elements and separated by the common yoke; secondary winding with each phase coil divided into two wound in opposite direction portions carried by symmetrical core legs, adjacent to the primary coils and separated by common yoke. The secondary short-circuited reactor winding is reduced to at least one close loop member with loop portions separated by the common yoke. The single, poly phase apparatus has at least one primary coil per set that includes a controllable device in circuit relation therewith to enable control of one primary coil relative to the other, either in current magnitude or in current phase shift. The controllable device being either a silicon control rectifier or transistor

Earthing

Earthing up to 2 MVA - 33 kV - Earthing transformers are used to create a neutral point in a three-phase system, which provides possibility for neutral earthing. The earthing can be through an arc-suppression reactor, a neutral earthing reactor or resistor or directly. Earthing transformers are usually oil immersed and may be installed outdoor. In cases where a separate reactor is connected between the transformer neutral and earth, the reactor and the transformer can be incorporated in the same tank.

Dry

Industrial, Substation & Distribution purpose - Upto 5MVA 33 KV naturally air cooled.
Instead of mineral oil, these transformers have air as the medium of insulation and heat dissipation. These are nonflammable, maintenance free transformers which can be installed at the load centre in enclosed area. Bringing the HT Line to the load centre reduces the line losses.

Inverter/ Converter Duty

One of the main differences from other types of transformers is that the load currents contain higher harmonics due to the distorted waveform. The converter to the transformer causes the distorted current waveform. This has to be considered current leads to higher losses & temperatures in the transformer. Network regulations also require reduction of harmonic distortion.
Instead of mineral oil, these transformers have air as the medium of insulation and heat dissipation. These are nonflammable, maintenance free transformers which can be installed at the load centre in enclosed area. Bringing the HT Line to the load centre reduces the line losses.

The most common use for converter transformers is found in applications such as :
● Solar renewable duty
● Variable speed drives (VSD)
● Aluminium electrolysis
● DC arc furnace
● Graphitizing furnaces
● Traction substations
● Copper refining

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