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I use the 39 Bus system ieee. And the problem I'm applying to the system. The line fault occurs in 0.5 seconds, and in 0.58 seconds, we have a line trip. And I see the output voltage of all busts for up to 5 seconds. But unfortunately, any turmoil that I cause to the system again, the voltage of all bases will eventually change from 0.95 to 1.05 and the system is stable! I used the .sav file related to the 39 Bus system ieee which I found on this site and can be downloaded at the link below. http://electrica.uc3m.es/pablole/new_england.html Does not have any problems Do you need any changes?