How to check bus current in PSSE?

AaronH
45 ●2 ●4 ●10

Need to check the load current (amps) for 40+ lines. Can Python check the load current?

This is what I have so far:

bus1 = 1004
bus2 = 1005
ckt = "1"

amps = brnmsc(bus1,bus2,ckt,"AMPS")
print amps

But I have 40+ lines. I only know to check the first line.

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3 answers

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answered Nov 15 '12

rimux
286 ●1 ●9

if you have list of the lines, all currents from them you can get very easy:

lines=[[5001,5013,"1"],
       [5001,5035,"1"]] #put here as many lines as you want

l=len(lines)
for i in range (l):
  error, amp =  psspy.brnmsc(lines[i][0],lines[i][1],lines[i][2],"AMPS")
  if error==0:
    print str(i+1)+". Line: ",lines[i][0],lines[i][1],lines[i][2]," : ",round(amp,2)," A"
  else:
    print str(i+1)+". Line: ",lines[i][0],lines[i][1],lines[i][2]," : ","error in brnmsc"

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Using `brnmsc` like this is another good way to get the current.

JervisW (Nov 15 '12)

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answered Oct 31 '12

jsexauer

586 ●4 ●11 ●18

updated Oct 31 '12

JervisW
1308 ●20 ●35 ●55

I'm a little confused by your question. It is titled "how to check bus current in PSSE." However, the concept of current is poorly defined for a bus as, per Kirchhoff's laws, the sum of the current at a bus is zero.

So I'm interpreting your question to mean "how do I report the current of all lines connected to a bus." First I would define a subsystem around the bus using the bsys() command:

psspy.bsys(1,0,[.12, 999], 0, [], 1, [busNum, ], 0, [], 0, [])

You can then use the bus subsystem API to get the amps of all tie-lines.

ierr, iarray = psspy.aflowreal(1,1,2,1,'AMPS')

If you are also interested in the other devices connected to a bus, there is a similar set of functions for the other circuit elements (amachreal, afxshuntreal, etc..) See Chapter 8 of the API documentation for more info.

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Using the subsystem API is a smart way to do this. @AaronH the "check bus current" title does raise some questions. If what you wanted was a report of currents connected to a bus, this is how you'd do that. I highly recommend looking into the subsystem functions `bsys` and `aflowreal`

JervisW (Oct 31 '12)

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