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Three power systems A

Three power systems A, B and C are in synchronous operation through the tie lines. o RA = 650 MW/Hz,
RB = 500 MW/Hz, RC = 450 MW/Hz o PMax AB = 400 MW, P AC BC Max = 150 MW, PMax = 120 MW.
Lines disconnected by protection system if power flow exceeds o An outage of line AC takes place. Find
the final frequencies and tieline flows