Per-unit impedances of synchronous machines — II

  title={Per-unit impedances of synchronous machines — II},
  author={A. W. Rankin},
  journal={Electrical Engineering},
THE preceding part1 of this paper derived the generalized per-unit equations of the synchronous machine. The machine impedances were divided into two groups: those measurable from the stator terminals (xd, xd′, r, and so forth) called the definitive impedances, and those internal impedances which cannot be measured from the stator terminals (Xafd, Xffd, Rffd, and so forth), called the nondefinitive impedances. The per-unit values of the definitive impedances are independent of the base rotor… CONTINUE READING