Nov 28, 2016 - 02:54 AM
Depending on what is the in the case, a time step above 50 us may be too large. Therefore, it may not be possible to use such a large time step. Without seeing the case, my guess would be that the time step is too large for some of the Tlines. PSCAD v2 might not have an error regarding this while v4.5. does.
PSCAD v2 is quite outdated and we suggest using a more current version. Versions v4.6.0 and v4.6.1 are much better to use.
Generally speaking, for EMT type simulations, you do not want to use such a large time step. To increase your simulation time you can split up the 68 bus network onto different cores and might be able to get a small increase in speed (depending on overhead).
I hope this helps.