Three Dimensional Flux Calculation on a Three-Phase, Transformer

A procedure has been developed to calculate the three dimensional magnetic flux density on the tank wall of a medium to large three-phase transformer. The procedure describes how the magnetic field can be obtained for the three-dimensional problem using a two dimensional solution for only one phase of a of three phase transformer. The technique has been programmed on a microcomputer to find and map the values for the magnetic flux density. Theoretical values obtained from this solution process are compared with measured values found on the tank wall of an actual transformer. The results agree within practical limits, suggesting that the technique is a valuable design procedure for future large transformer design.