Loading values for branches in ACCC

asked 2013-05-03 03:03:50 -0500

Pablo Nicolas
35 ●2 ●2 ●7

updated 2013-05-08 08:17:51 -0500

I have a problem with the ACCC OVERLOAD REPORT. When I do a ACCC, the value of flows for the branches is not the value in the metered side of the branch or the largest flow. I think that the side of the value is arbitrary. I need to know the largest value to calculate overloads with python. Can you help me?

The code is:

ierr = psspy.dfax([0,1],subfile,monfile,confile,dfxfile)   
ierr = psspy.accc_with_dsp_2(_f,[0,0,0,1,1,0,0,0,0,0],r"""ASTURIAS""",dfxfile,accfile,"","")

sumry = pssarrays.accc_summary(accfile=accfile)

rate = sumry.rating.a

for lbl in sumry.colabel:

       rlst  = pssarrays.accc_solution(accfile=accfile,colabel=lbl,stype=stype_cnt, busmsm=busmsm,sysmsm=sysmsm)

       for i in range(len(rlst.mvaflow)):
            mvaflow = rlst.mvaflow[i]

Thanks in advance!

Pablo Nicolás

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Comments

Can you show the code you are using now to run the ACCC report? Is it Python?

JervisW ( 2013-05-08 05:00:36 -0500 )edit

I´ve the same problem when I run the ACCC report directly in PSSE.

Pablo Nicolas ( 2013-05-08 08:20:39 -0500 )edit

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2

answered 2013-05-09 11:50:44 -0500

cajief

174 ●1 ●1 ●10

Hey I think the issue you're seeing is due to how percent loading is calcualted on transformer vs. non-transformer branches. Transformers are by default on MVA loading whereas non-transformer are current expressed as MVA loading (assumes nominal voltage). Look in the Program Operation Manual for more on this, specifically ACCC and RATE. ACCC reports the line end with the larger loading.