Dear Readers,

In this issue, the Transformers Magazine brings you a wide range of technical articles – from general overviews to advanced specialised articles, and two columns.

Jean Sanchez presents an overview of six most commonly used power transformer winding types: continuous disc windings, interleaved windings, intershielded windings, layer windings, helical windings, and pancake windings.

Dielectric and thermal design considerations for the use of esters as insulating and cooling fluid are presented in the article by Mark Lashbrook. Three case studies are described, including the details which caused decisions to be made about the usage of alternative fluids, for example, greater demand for fire safety, the increased need for protection of the environment from pollution and avoiding fire extinguishing system.

In his column Trends in Power Transformer Failure Analysis, Wallace Binder writes about different failure modes in transformers and methods for detection of these failures.