Design of distribution transformers – e-lesson #14: Cast resin & dry type transformers

This is the fourteenth e-lesson in the Design of distribution transformers course, conducted on the Master's level. Here you can save your seat.

This lesson provides an overview of cast resin and dry type distribution transformers, which use no liquid for insulation or cooling unlike traditional oil-filled units. Hosted by transformer expert Mario Salano, the session focuses on the key characteristics and design considerations of the two main dry transformer technologies - cast resin dry transformers (CRT) and vacuum pressure impregnated (VPI) transformers. CRTs, which encapsulate windings in sealed epoxy resin, offer advantages like better seismic performance and reduced fire risk, though they tend to be more costly. The lesson covers critical design parameters, safety features, and environmental factors driving the growing adoption of dry transformers, especially in renewable energy applications. Overall, the session offers a comprehensive look at this increasingly important transformer technology.