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Hello, When I do dynamic simulation in PSS/E to find the critical clearing time I notice from channels plot that if a fault occurs in a bus with generator the network is asynchronous at any time I clear the fault and a line is tripped. On the contrary, when an fault occurs in any other bus, the system is permanently synchronized at any time I clear the fault. So i can not find the critical clearing time. Can someone explain to me why this is happening and what I am doing wrong?