Magnetic properties of grain oriented electrical steel in model transformer under direct current-biased magnetization

摘要

Iron losses and acoustic noises of the model transformer under DC-biased magnetization were empirically investigated. To clarify the influence of magnetic properties of transformer core materials, two types of grain oriented electrical steels-high permeability grade (HGO) and conventional grade (CGO)-were used as core materials. Iron losses increased with superimposing DC-bias magnetic field (H_(DC)) in both materials, and the iron loss increment in HGO was larger than that in CGO. Acoustic noises increased with increasing H_(DC) both materials; however, noises emitted from the core of HGO were smaller than those of CGO.