Magnetic Properties of Cores in Three-Phase Transformers.

Results of tests performed in single- and multi-stack model cores of distribution transformers are given. On the basis of the results various effects are determined. These include: the effect of the method by which the laminations at the core joints are interleaved, the effect of the dimensional interrelations, the effect of the yoke/core leg ratio on their cross-sections, the effect of the yoke cross-section profile, and the effect of the value adopted for magnetic flux density in the core leg on the amount of active power loss in and apparent power absorption by the cores.