A 3-phase, 190 kW, 2300 V, 60 Hz, Y-connected nonsalient rotor synchronous motor

Question

A 3-phase, 190 kW, 2300 V, 60 Hz, Y-connected nonsalient rotor synchronous motor has a synchronous reactance of 11 ? per phase. When it draws 165.8 kW the power angle is 15 electrical degrees. Neglect ohmic losses. a) Determine the excitation voltage per phase Ef. b) Determine the supply line current Ia. c) Determine the supply power factor. d) If the mechanical load is thrown off and all losses become negligible, Determine the new line current and supply power factor. Draw the phasor diagram. By what percent should the field current If be changed to minimize the line current?

Explanation / Answer

http://faculty.ksu.edu.sa/eltamaly/Documents/Courses/EE 339/27-28-2nd/final_solution_EE339_2nd_27_28.pdf

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