SOLUTION
(a) The unsaturated synchronous reactance of this generator is the same at any field current, so we will
look at it at a field current of 380 A. The extrapolated air-gap voltage at this point is 18.3 kV, and the
short-circuit current is 1240 A. Since this generator is Y-connected, the phase voltage is
V 18.3 kV/ 3 10,566 V and the armature current is 1240 A A I . Therefore, the unsaturated
synchronous reactance is