Abstract
Three phase core type power transformer core is usually made that core laminations are lapped at so called T-joint of legs and yokes, And yokes are magnetically connected over three phases to make the magnetic flux be able to flow smoothly between legs through yokes. It has been hardly believed that split core which has a full separation at the center of the leg including yokes may be used for power transformers from the points of core loss, local heating and noise by the imbalance and distortion of magnetic flux though it is useable for distribution transformers with wound cores, Split core has so many advantages in core manifacturing though that magnetic characteristics were stadied in detail for small core models to make the practical applicability clear and was checked with less degradation of magnetic characteristics compared to conventional cores using a full scale 1500/3 MVA model transformer core.
