Insulating transformers

A dry-type transformer, comprising:

• at least a first winding;
• at least a second winding;
• one or more cylindrical barriers between the at least first and second windings;
• one or more insulating modules, each insulating module comprising:
• a dielectric screen and a supporting block, the supporting block to support the dielectric screen over the first winding of the transformer,
• the dielectric screen partly extending around the second winding and having a first substantially even portion configured to adapt to a space defined by a corresponding one of the one or more cylindrical barriers arranged between the first and a second windings of the transformer and a second substantially even portion, transversal to the first portion and to the first winding of the transformer and extending outwards from the first portion and beyond the supporting block.