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Here is something incredibly basic, but hopefully it will get you started. This will run the same fault on the same case in 5 simultaneous processes. Hopefully you can figure out how to make it work with what you want to do. For example, if you wanted to run multiple different faults on the same base case, you could create a function for each fault (ie run_fault_1, run_fault_2, etc), then scrap the for loop and start a new thread for each fault function.

import os,sys
PYTHONPATH = r'C:\Program Files (x86)\PTI\PSSE33\PSSBIN'
MODELFOLDER = r'C:\Program Files (x86)\PTI\PSSE33\MODELDRW'

sys.path.append(PYTHONPATH)
os.environ['PATH'] += ';' + PYTHONPATH

import psspy
import redirect
import multiprocessing

def main():
    # Redirect output from PSSE to Python:
    redirect.psse2py()

    # Last case:
    CASE = r"C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\savnw.sav"
    psspy.psseinit(12000)
    psspy.case(CASE)

    # Convert loads (3 step process):
    psspy.conl(-1,1,1)
    psspy.conl(-1,1,2,[0,0],[100,0,0,100])
    psspy.conl(-1,1,3)

    # Convert generators:
    psspy.cong()

    # Solve for dynamics
    psspy.ordr()
    psspy.fact()
    psspy.tysl()

    # Save converted case
    case_root = os.path.splitext(CASE)[0]
    psspy.save(case_root + "_C.sav")

    # Add dynamics data
    psspy.dyre_new(dyrefile="C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\savnw.dyr")

    # Add channels by subsystem
    #   BUS VOLTAGE
    psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,13,0])
    #   MACHINE SPEED
    psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,7,0])

    # Add channels individually
    #   BRANCH MVA
    psspy.branch_mva_channel([-1,-1,-1,3001,3002],'1')

    # Save snapshot
    psspy.snap(sfile="C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\python_test.snp")

    # Run multiprocessed faults
    for i in range (5):
        arguments = (case_root + "_C.sav", 
                "C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\python_test.snp",
                case_root + "_" + `i` + ".out",
                case_root + "_" + `i` + ".log")

        # Start new thread
        p = multiprocessing.Process(target = run_fault, args = arguments)      
        p.start()    

def run_fault(case, snp, out, log):
    # Redirect output from PSSE to Python:
    psspy.psseinit(12000)
    redirect.psse2py()
    psspy.report_output(2,log,[0,0])
    psspy.prompt_output(2,log,[2,0])
    psspy.progress_output(2,log,[2,0])

    # Load case
    psspy.case(case)
    psspy.rstr(snp)

    # Initialize
    psspy.strt(outfile=out)
    psspy.run(tpause=0)

    # 1-phase fault branch 3001 to 3003
    psspy.dist_branch_fault(ibus=3001, jbus=3003, id='1',units=1,values=[352,-2389])

    # Run to 4 cycles
    time = 4.0/60.0
    psspy.run(tpause=time)

    # Clear fault
    psspy.dist_clear_fault()
    psspy.dist_branch_trip(ibus=3001, jbus=3003, id='1')

    # Run to 20 seconds
    time = 20
    psspy.run(tpause=time)

    psspy.pssehalt_2()    

if __name__ == "__main__":
    main()

Here is something incredibly basic, but hopefully it will get you started. This will run the same fault on the same case in 5 simultaneous processes. Hopefully you can figure out how to make it work with what you want to do. For example, if you wanted to run multiple different faults on the same base case, you could create a function for each fault (ie run_fault_1, run_fault_2, etc), then scrap the for loop and start a new thread for each fault function.

import os,sys
PYTHONPATH = r'C:\Program Files (x86)\PTI\PSSE33\PSSBIN'
MODELFOLDER = r'C:\Program Files (x86)\PTI\PSSE33\MODELDRW'

sys.path.append(PYTHONPATH)
os.environ['PATH'] += ';' + PYTHONPATH

import psspy
import redirect
import multiprocessing

def main():
    # Redirect output from PSSE to Python:
    redirect.psse2py()

    # Last case:
    CASE = r"C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\savnw.sav"
    psspy.psseinit(12000)
    psspy.case(CASE)

    # Convert loads (3 step process):
    psspy.conl(-1,1,1)
    psspy.conl(-1,1,2,[0,0],[100,0,0,100])
    psspy.conl(-1,1,3)

    # Convert generators:
    psspy.cong()

    # Solve for dynamics
    psspy.ordr()
    psspy.fact()
    psspy.tysl()

    # Save converted case
    case_root = os.path.splitext(CASE)[0]
    psspy.save(case_root + "_C.sav")

    # Add dynamics data
    psspy.dyre_new(dyrefile="C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\savnw.dyr")

    # Add channels by subsystem
    #   BUS VOLTAGE
    psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,13,0])
    #   MACHINE SPEED
    psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,7,0])

    # Add channels individually
    #   BRANCH MVA
    psspy.branch_mva_channel([-1,-1,-1,3001,3002],'1')

    # Save snapshot
    psspy.snap(sfile="C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\python_test.snp")

    # Run multiprocessed faults
    for i in range (5):
        arguments = (case_root + "_C.sav", 
                "C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\python_test.snp",
                case_root + "_" + `i` + ".out",
                case_root + "_" + `i` + ".log")

        # Start new thread
        p = multiprocessing.Process(target = run_fault, args = arguments)      
        p.start()    

def run_fault(case, snp, out, log):
    # Initialize PSSE
    psspy.psseinit(12000)

    # Redirect output from PSSE to Python:
    psspy.psseinit(12000)
Python      
    redirect.psse2py()

    # Create log    
    psspy.report_output(2,log,[0,0])
    psspy.prompt_output(2,log,[2,0])
    psspy.progress_output(2,log,[2,0])

    # Load case
    psspy.case(case)
    psspy.rstr(snp)

    # Initialize
Initialize case
    psspy.strt(outfile=out)
    psspy.run(tpause=0)

    # 1-phase fault branch 3001 to 3003
    psspy.dist_branch_fault(ibus=3001, jbus=3003, id='1',units=1,values=[352,-2389])

    # Run to 4 cycles
    time = 4.0/60.0
    psspy.run(tpause=time)

    # Clear fault
    psspy.dist_clear_fault()
    psspy.dist_branch_trip(ibus=3001, jbus=3003, id='1')

    # Run to 20 seconds
    time = 20
    psspy.run(tpause=time)

    psspy.pssehalt_2()    

if __name__ == "__main__":
    main()