Power converters are present in the electricity distribution network in all kinds of processes and manufacturing industries. A power converter is an electrical or electromechanical device for converting electrical energy and is used to increase or decrease the voltage (transformers), convert alternating current into direct current (rectifier) or to control and convert the frequency of alternating current (frequency converter).
Transformation, rectification and conversion of electrical energy generate heat, and therefore the machines involved must be cooled through the use of gaskets for plate heat exchangers and air heat exchangers.
A transformer is a static device which transfers energy by inductive coupling between its circuits. A variable current creates a varying magnetic flux in the ferromagnetic core transformer. Consequently, it also creates a changing magnetic flux through a secondary winding. This variation of the magnetic flux induces a change in electromotive force of the secondary winding and in a temperature increase which is controlled by the use of heat exchangers.