Study of Magnetic Shielding Effectiveness in Compact Power Transformers for Mobile Applications
Abstract
This paper presents a computational assessing of a singular type of a flux collector, designed to act as magnetic shielding in compact power transformers for mobile applications. Calculations were performed by using a 3-D finite-elements program for modelling the operation of a 33.3MVA, 69.3/13.8kV three-phase compact transformer. The results show that due to its clamp-like shape and its location surrounding the core near the winding ends, this kind of flux collector efficiently mitigates the leakage magnetic flux, by reducing stray losses and hot spots, which usually lead to thermal issues on some sensitive structural parts of the compact transformers, such as tank and beams.