Section 14.5: Performance of a Round-Rotor Synchronous Generator cont.
Ia = |Ia|/q where |Ia| = 2.5 MVA/(Ö3´6.6KV) = 218.7 A. and q = +cos-1(0.8) » +36.87° so that KVL yields:
E = Vt + ZsIa = 3811 V. + 10.4/+89.6°W´218.7/+36.87° A.
Which yields E » 3065/+36.6° V. so that
VR% = [(3065 - 3811)V./3811V.]´100% » -19.6%
Repeat Example 14.3 given the load power factor is 0.8 leading
(instead of 0.8 lagging).