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what my operation process is:

1)open savnw.sav

2)click "Power Flow -> Solve", check in "Convert Generators" and "Convert/Reconstruct Loads"

3) click "Power Flow -> Covert Loads and Generator"

4)click "Power Flow -> Solution -> TYSL", check in "FACT"

5)open savnw.dyr

6)click "Dynamic -> Simulation -> Perform Simulation(STRT/RUN)"

7)create out file, click "Initiate", set 1s and run

8)Adding fault

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When I add branch unbalance falut to other bus pair, it can be work;

but Bus-3001 to Bus3003, something wrong, the information in output bar like this:

Channel output file is "C:\Users\Yang\Documents\PTI\PSSE34\EXAMPLE\tt001.outx"

 Using machine R and X' from fault analysis data

 Diagonals = 23   Off-diagonals = 38   Maximum size = 58
 Positive sequence network: Diagonals = 23   Off-diagonals = 38

 Negative sequence network: Diagonals = 23   Off-diagonals = 38

 Diagonals = 23   Off-diagonals = 32   Maximum size = 46
 Bus    101     [NUC-A       21.600] is isolated in the zero sequence network
 Bus    102     [NUC-B       21.600] is isolated in the zero sequence network
 Bus    206     [URBGEN      18.000] is isolated in the zero sequence network
 Bus    211     [HYDRO_G     20.000] is isolated in the zero sequence network
 Bus   3011     [MINE_G      13.800] is isolated in the zero sequence network
 Bus   3018     [CATDOG_G    13.800] is isolated in the zero sequence network
 6 buses are isolated in the zero sequence network
 Zero sequence network: Diagonals = 23   Off-diagonals = 32




Messages for api DIST_SPCB_FAULT_2
 Terminated due to invalid fault specification or application:   (003701)
 Invalid branch circuit "1" from bus 3001 [MINE        230.00] to bus 3003 [S. MINE     230.00]   (003702)
 There is no path to ground at bus 3001 [MINE        230.00]   (003713)


 Output completed