From this information it can be concluded that the critical
speed from the proposed method will always be slightly overestimated.
This inaccuracy will mainly be caused by the flux
transient at reclosing, and will not be much influenced by any
remaining torque during the fault or the flux transient at the moment
the fault occurs. However, the accuracy of estimated critical
clearing time will depend on more factors. In addition to
the initial and reclosing flux transients, any remaining torque
during the fault, and any mechanical friction will influence the
accuracy.