Answer / visakh

In this type of transformer there is air is used for cooling
and also insulation.It is only used for indoor substation.It
is one of the maintenance free transformer.

Answer / nagarjuna

Dry type transformers are those which uses air as medium for insulation.Dry type transformers r more reliable .

Answer / mior

In general, there are 2 types of Tx; Dry type (normally
called cast resin) and Oil Type Tx.

Selection to design the Tx whether to be dry or oil type is
subject to the cooling system of the tx itself. For the Dry
Tx, air will be the cooling media whereby in Oil Tx, the
oil itself will be a media to cool the tx’s core winding.

There are 2 types of cooling system that can be use named
Natural Cooling (ONAN) and Force Cooling (ONAF). These
types of cooling systems can be applied for both tx.

In principle, both (Oil & Dry) Tx works the same way. The
major difference is that, you can see the core winding for
the Dry Tx (since the winding enclosed in air ventilated
enclosure) but you can’t see it on Oil Tx (since the
winding enclosed in confine metal enclosure@tank).

Mior
www.Guide4ElectricalConsultant.com

Answer / kand

Dry type transformer is one of natural air cooling
transformer.whole winding of transformer are covere by air
ventilated sheet.
Mostly it is used small rating (ex=2 MVA.
Main advantage is maintentance free.

Answer / thanigai1984

In that dry type transformer we used forced Air medium is
the cooling system....

condition: we didnt used the On load tap changer ... used
only Off load tap changer

Answer / thilaknpti

dry transformers (containing no liquid) are enclosed in
sealed, pressurized tanks and cooled by nitrogen or sulfur
hexafluoride gas.

Experimental power transformers in the 2 MVA range have been
built with superconducting windings which eliminates the
copper losses, but not the core steel loss. These are cooled
by liquid nitrogen or helium.

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