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I'm trying to verify the line constants for my short circuit model - I have 8 different substations and each T line has different length - When I model the structures in PSSE Line Prop, do I need to model all structures and set the circuit location in ft based on my reference substation or do I need to build the structure individually and get the R, X values for just that circuit.

The impedance of each circuit is different with all structures modeled vs individually. What's the correct way?