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I'm afraid you may have to make a routine your self in Python to build PTDF matrix, extracting the data from PSS/E. The PTDF is based on Ybus matrix, reactance >> resistance, so all resistance in "R" column to zero "0". Then extract Ybus from PSS/E and work with it in Python to build the PTDF matrix. There could be other parameters than affect the construction of the Ybus, take care of it. I remember you can't build the PTDF matrix directly from PSS/E but the LODF. LODF can be build directly with a command.