DRY TYPE TRANSFORMERS

It differs from oil type transformers according to the cooling method. HV windings are transformers coated with epoxy cast resin under vacuum. LV windings are transformers that can be manufactured by both cast resin and resin-impregnated prepreg method.

They are produced in the power range of 25-25000 kVA, up to the voltage level of 36 kV, with the option of natural air cooling (AN) or fan cooling (AF). Up to 40% power increase can be achieved by using the cooling fan.

Dry type transformer manufacturing, which requires advanced technology and knowledge, is increasing its market share compared to oily type transformers day by day with increasing customer demands in recent years. However, in today's technology, the production of high power dry type transformers, especially above 36 kV voltage level, includes technological difficulties. Research and development studies on this subject continue at full speed. The absence of an environmentally harmful coolant such as oil, less risk of fire, no maintenance, resistance to moisture and humidity, ability to be put into operation at any time without being in operation for a long time without any problems, and overloading up to 40% of the nominal power with fan cooling reinforcement. It is preferred more than oil type distribution transformers for reasons such as However, dry-type distribution transformers, which are the most important negative side of the fact that the sales price is higher than an oil-type transformer of the same power, have constantly increased their sales share in recent years.