A Numerical Method for Three Phase Transformer Circuits Using the Tableau Form

The tableau form is applied in nonlinear analysis of bank connection three-phase transformer circuits. Differences between bank connection transformers and three-phase circuits using three-phase iron cores appear only in the magnetic circuit, and not in the electrical system. Numerical analysis of the Y-Y connection indicated the generation of a neutral point voltage, which originates in the nonlinearity of the iron core. In a linear analysis, this neutral point voltage did not appear at any applied voltage.