Section 14.7: Performance of a Round-Rotor Synchronous Motor cont.
Then Ia = (Vt - E)/jXs = (127/0° - 220/+30°)V./j1.27W = 100/+30° A. Ergo, Smot. = VtIa* = 127/0°V.(100/+30°A.)* = 12.7/-30° KVA = 11 KW - j6.35KVAR (1ph.) = 33 KW - j19.05KVAR (3ph.)
\ Qmot. = -j19.05KVAR (Three-phase)
A 220 V., 13.47 KVA, 0.707 lagging power factor load is in parallel with a three-phase wye-connected round-rotor synchronous motor having a synchronous reactance of 1.27W. The motor draws 33 KW at a power angle of 30°. Calculate the reactive power of the motor and the net (overall) power factor of the motor-load combination