etap case-0175

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Independent 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 Operating system Windows 7 / 64 Bit System properties CPU @1.80GHz RAM: 2.00GB 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 Issue Non-convergence when Loads changes 1 kVA 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 1: convergence/results when load=12008KVA Figure 2: non convergence when load=12009KVA

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Page 1: ETAP CASE-0175

Independent 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

Operating system Windows 7 / 64 Bit

System properties CPU @1.80GHz RAM: 2.00GB

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

Issue Non-convergence when Loads changes 1 kVA

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 1: convergence/results when load=12008KVA

Figure 2: non convergence when load=12009KVA

Page 2: ETAP CASE-0175

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

Page 3: ETAP CASE-0175

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:

4.16 kv , 12008 KVA, PF=99 %

SVC(Static Var Compensator):

Voltage Rating=4.16 KV, Vmax=110%, Vmin=90%, Vref=100%

Inductive Rating=0,

Capacitive Rating= 15.87 MVAR

Max Inductive Rating= 0

Max Capacitive Rating= 15.87 MVAR

Model: TYPE 1, for all data used ETAP sample data

Figure 5: Input data of modeled network