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Kundur two area system_Generator speed slowly increase

Kundur two area system_Generator speed slowly increase

Kundur two area system_Generator speed slowly increase

(OP)
Hi, everyone
Im building the kundur two area system in Kundur's book example 12.6 in DigSILENT. the system is stable and the load flows are right when no fault applies. Generators are equipped with AVR and PSS as stated in the book. I selected one of the generators to be the slack bus.
However, after applying a three phase short circuit on line 8-9 and clearing it by disconnecting the line, the speed of all 4 generators first converges and then starts to increase very slowly. it is so slow that Im not sure if it is an unstable behaviour.
Im really curious about what causes this behaviour. please find the attached single line diagram for the system

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