Design of distribution transformers – e-lesson #6 Electromagnetic design (part I)

This is the sixth lesson in the DoDT course by Mario Salano, and a third one conducted on the Intermediate level. Here you can save your seat.

This lesson focuses on the electromagnetic design of transformers, reviewing the fundamental formula and emphasizing additional constraints like losses, temperature, short-circuit, impedance, and insulation. The Eco Design Directive's impact on transformer efficiency and loss limits is discussed, with specific values provided for common sizes. Winding material properties, iron losses, and advanced materials like amorphous steel are explored. Impedance and its relationship to fault currents and load types are introduced as important design considerations. Temperature management through oil cooling and tank design is highlighted as critical for transformer sizing. The short-circuit voltage parameter and its influence on transformer construction are explained. Transformer life expectancy is shown to depend heavily on temperature and moisture levels.