Microsoft Word - IPE-ETAP CASE-0175.docxIndependent Power Engineers Never Trust the Machine, trust the engineer!
Who are we? IPE (Independent Power Engineers) is a nonprofit organization passionate about the
power engineering industry. Our main mandate is to test and expose the different
issues and dysfunctions of different power system simulation soft wares. Please note
that all of our tests are made available also on YouTube for transparency. Look for
Independent Power Engineers on YouTube to get access to our latest videos.
Product ETAP™,
Manufacturer OTI™ (Operation Technology Inc),
Version ETAP: 4, 5, 6, 7.0, 7.1, 7.5, 11, 11.1, 12.0,12.5 ,12.6 and 14,
Revision All Versions/Revisions
ETAP CASE-0175
Analysis Load Flow
Analysis detail Load Flow, Adaptive Newton Raphson, Precision= 0.00001 ,Max No. of Iteration =9999,
Events Load Flow non-convergence
Reason Unknown
Proposed solution No
ETAP CASE-0175 Overview: This case has been analysis sample in our web presentation regarding to evaluating ETAP software from version 4
to version 14.
Figure 2: non convergence when load=12009KVA
Independent Power Engineers Never Trust the Machine, trust the engineer!
ETAP CASE-0175 Explanation: There is no explanation about how this non-convergence is happening in this extremely simple network and we
leave it to judge it by yourself!
But It is clear that power flow of ETAP software has big holes and problems in the power flow engine in such a way that
small modification will result to non convergence.
We just have a question? How ETAP Company (OTI)can compensate damages and lost of projects due to all issues exist in
ETAP software during last 15 years???
Figure 3: convergence/results when load=12889KVA
Figure 4: convergence/results when load=12888KVA
Independent Power Engineers Never Trust the Machine, trust the engineer!
Following are data of Network modeled in ETAP software:
Power Grid:
Rated KV= 4.16 , 3 phase SC Rating = 40 , 3 phase X/R = 10 , 1 phase SC Rating = 40 , 1 phase X/R = 10 ,
Operating Voltage=100 %, Mode=Swing
Cable:
Length=19 m , 400 mm2, AL, ICEA, Mag. 50 HZ, Rubber2, R+ =0.09299 ohm/km , X+ = 0.1118 ohm/km
R0 = 0.29292 ohm/km, X0 = 0.27503 ohm/km
No. of conductor per phase= 6
Load:
SVC(Static Var Compensator):
Voltage Rating=4.16 KV, Vmax=110%, Vmin=90%, Vref=100%
Inductive Rating=0,
Model: TYPE 1, for all data used ETAP sample data
Figure 5: Input data of modeled network