Studies have shown that electrical equipment, including transformers, is the leading cause of fires in various industries. However, dry-type cast resin transformers have been shown to reduce this risk. Since they do not contain petroleum, they greatly reduce the risk of fire. They are also rated F1 in terms of fire protection standards. This means they will not cause a fire under short circuit conditions and are inherently fire resistant.
The insulation of the transformer consists of epoxy resin, an environmentally friendly material. They prevent the winding from catching fire. They are virtually maintenance-free, so you don't need to buy expensive fire suppression equipment. Also, cast resin transformers do not emit toxic fumes and are not even affected by electric arcs.
This reduction in fire risk allows dry-type transformers to be safely installed indoors, bringing many benefits to the user. One of them is that there is no need to bear the construction cost of the transformer outdoor facilities. The closer proximity to the load also requires less cabling to the transformer and allows for lower installation costs.
The dry-type transformers use the ambient air as cooling medium – and also insulation – of their windings and other parts.
Their main and usual purpose if the same as that of transformers immersed in insulating liquid, that is, to adjust the primary voltage to the levels used in industries, homes and enterprises in general.
Considering the strong appeal to minimization of the environmental impact and fire risks, in addition to lower installation and maintenance costs, their most usual applications are:
