Design improvements in modern distribution transformers

In the paper design improvements of distribution transformers related to improved energy efficiency and environmental awareness are discussed. Eco transformers, amorphous voltage regulated filled with ester liquids analyzed. As a consequence growing importance, European Commission has adopted new regulation which defines maximum permissible levels load no-load losses rated power ≤ 3150 kVA, minimum peak index for > kVA up 40 MVA. The impact on economy transformer is presented. Amorphous 70 % lower in comparison conventional could be an alternative respect efficiency. Although their initial price higher than some studies show that they might have economic advantages. increasing penetration distributed sources can cause increase variations low networks. To keep within limits defined by EN50160, used. mineral oil been used as dielectric fluid many years, there environmentally friendlier alternatives – natural synthetic ester-based fluids.