Hello
What is the appropriate Python syntax which can calculate and provide only "Three-Phase (symmetrical) short circuit" at a certain bus. The "psspy.scmu" calculates additionally line to ground and double line to ground faults but I need only 3-Phase SC current and to be output it to a txt file by using this syntax: psspy.report_output(2, r"""SC-3PH.txt""", [0, 0])
Thanks in advance.
The following code calculates the 3 phase fault current at bus 154 in savnw.sav and writes the result to a text file:
buses = [154]
psspy.bsys(1,0,[0.0,0.0],0,[],len(buses),buses,0,[],0,[])
psspy.ascc_3(1,0,[0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0],1.0,"ascc3P.txt","","")
The file contains the pu current, 69.0545 pu.
3 154 69.0545 3.7513 DOWNTN 230.00
Use Ibase=Sbase/Vbase/sqrt(3) = 100/230/sqrt(3) = 0.251022 kA to convert to kA. 69.0545*0.251022 = 17.334 kA.
You can complete the script to rewrite the file with the fault current in kA instead of pu.
I truly appreciate your generosity, as always. Can I ask about the 3.7513 value. What does it express? To make the fault current outputs in KA, I tried to use the command: psspy.ierr = short_circuit_units(1) but it seems not correct. Could you please help.
SCMU solves networks with unbalances, a 3 phase fault is solved as you said, a LG on phase A plus a LLG between phases B and C and ground.
You can use the activity ASCC (psspy.ascc_3) to compute 3 phase short-circuit calculations. Other options is the IECS activity.
Asked: 2025-10-19 14:00:37 -0500
Seen: 151 times
Last updated: Oct 26
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