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The playback model is a handy way to set and vary voltage of an infinite bus machine during simulation. you will find it in the model manual under the name PLBVFU1. To use this model you need to provide a CSV data file containing columns for time, positive sequence voltage and frequency. Something like this:

  0.000,  1.000, 50.000
 10.000,  1.000, 50.000
 10.020,  1.212, 50.000
 20.020,  1.212, 50.000
 20.040,  1.000, 50.000
 25.020,  1.000, 50.000

This produces a transient over volatge between 10.02 sec and 20.02 sec