This paper presents a MATLAB program that utilizes a Graphical User Interface (GUI) to calculate the electrical quantities of three phase circuits. The GUI is designed in a way to allow the user to enter the resistances and reactances of the source, the transmission line and that of the load respectively. It also requires a voltage value of one of the phases at the generator end. This program performs the calculations with respect to the specified connection type. There are four types: wye-wye, wye-delta, delta-wye and delta-delta. This allows the students to compare the obtained results and can check the validity of their solutions of homework problems involving three phase circuits in electric circuits, energy conversion and power systems courses.
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