Given that the results of the previous section show some difference
between the calculation method and measured data, and
due to the high level of uncertainties introduced by the lab machine
parameters, it is relevant to give some additional discussion
regarding the difference observed in the results, and to validate
them against simulations. This is also done in order to discuss
the neglected transients and the direction of influence these
will have on the accuracy of the results.
Results from detailed time-domain simulations of the investigated
cases by use of the PSCAD/EMTDC simulation software,
are given in Table V in the form of critical speed and critical
clearing time. This allows removing the parameter uncertainties
while the influence of flux transients of the machine can be
investigated. In Table V, the values of critical speed, taken as
speed at the moment of fault clearing, and the values of critical
clearing time from the simulations are compared directly with
the values obtained with the calculation method.