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I manage to perform my power flow simulation as well as dynamic simulation. Just that when i want to apply unbalanced branch fault, this problem occurs: Branch has NO ZERO SEQUENCE IMPEDANCE. When i entered the zero sequence data, and i run again, it shows 'NO PATH TO GROUND'. still figuring out why

I manage to perform my power flow simulation as well as dynamic simulation. Just that when i want to apply unbalanced branch fault, this problem occurs: Branch has NO ZERO SEQUENCE IMPEDANCE. When i entered the zero sequence data, and i run again, it shows 'NO PATH TO GROUND'. still figuring out why