Structure design and magnetic-vibration characteristics analysis of hybrid core for high efficiency distribution transformer

Amorphous alloys and grain-oriented silicon steels are extensively utilized as core materials in distribution transformers, each exhibiting distinct advantages and inherent limitations. However, achieving further performance enhancements in distribution transformers constructed from a single material poses significant challenges. In this study, we propose a novel design methodology for a hybrid core comprising amorphous alloy and grain-oriented silicon steel, grounded in magnetic circuit theory. Utilizing this approach, a prototype transformer with a hybrid core was designed and manufactured. The magnetic flux density distribution, core loss, and vibration acceleration of the hybrid core were meticulously measured and compared against those of transformers with single-material cores. The experimental results, particularly the comparative analysis of flux density, substantiate the efficacy of the proposed design methodology.