Flux distribution in three phase transformer cores with various T-joint geometries

Software developed at the Rutherford and Appleton Laboratories, U.K. and based on a finite element technique has been used to compute the magnetic fields in electrical steel sheets in various types of transformer cores. Initially isotropic steels were considered but later an attempt was made to include the effect of magnetic anisotropy in a simple manner. Some of the cores considered possessed joints (modelled as .02cm air gaps) in the corners and T-sections. The computed results have been compared with experimental results taken from practical cores possessing identical geometries.