... iqs , (7. 7-30), and iqs , (7. 7-35), we obtain (7. 7-23) Similarly, r** r* if we add ids , (7. 7-31), and ids , (7. 7-36), we obtain the last term of (7. 7-24) In other words, (7. 7-23) and (7. 7-24) ... in the voltages from the prefault to fault values are r vqs (s) = − r vds (s) = 2Vs s (7. 7-6) (7. 7 -7) If (7. 7-6) and (7. 7 -7) are substituted into (7. 7-1) and (7. 7-2), and if the terms involving ... axis 7. 3 OPERATIONAL IMPEDANCES AND G(p) FOR A SYNCHRONOUS MACHINE WITH FOUR ROTOR WINDINGS In Chapter 5, the synchronous machine was represented with a field winding and one damper winding in the...