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Unfortunately, PSSE doesn't have any channel for branch current. I see at least three alternatives for you.

1. Calculate from line MVA and bus voltage. Add channels with line MVA flow and bus voltage magnitude. Use a function in plotbook to calcuate I = MVA / Vpu / base voltage / 1.73205 to get the current in kA.

2. Use a line relay model, e.g. TIOCR1, with dummy parameters and assign the model VAR containing the line current into a channel. The line current will be in pu.

3. Write a user written model that calculates the line current and assigns it to a VAR. Add a channel for the model VAR. This is how I solved it myself!