CONSIDERATIONS OVER GEOMETRIC MODELLING OF AIR COOLED DRY ELECTRICAL TRANSFORMER

摘要

In the transformer design the knowledge of the temperature rise in windings is necessary to provide a reliable and efficient insulation. The paper deals with a method for constructing reduced size transformer models for thermal testing. It presents the necessary mathematics and illustrates the method by example using a 250 kVA dry autotransformer as original and a 20 kVA model.