How do I design in have autotransformer in ETAP?

[fgm]

I have autotransformer consisting of 3 single-phase auto transformers 400/220 / 31.5 kV and 267 MVA unit capacity or total capacity of 800 MVA
Modeling it with a 3-Winding Transformer , but I can't understand in the section for "impedance" resistance for a 800 MVA оr for a 267 MVA should I enter?

[surgeArrester]

You need to read symmetrical components by blackburn to know the basics. You need to go back the basics of per unit calculations.

Let's always remember that:
ETAP is just a tool. A garbage input results in a garbage output.


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[BabyBear]

Hi,

when dealing with single phase transformers to be connected to form a bank of three phase power transformer, the impedance per transformer should be used. this is independent when it is connected as an auto transformer bank. But, since the auto transformer is like a three-winding transformer, the nameplate of the transformer will have illustrated three values of impedances measured with respect to each other (i.e. H-X, H-Y, X-Y). In this case, you have to solve the value of impedance per side of transformer (H, X, Y) because these data are needed in the power flow software. the formula for that is usually written in several excellent texts in power system. In the case of PSS/E, you will have to just input the nameplate parameters and the software engine will solve the required impedances.

[BabyBear]

Hi,

when dealing with single phase transformers to be connected to form a bank of three phase power transformer, the impedance per transformer should be used. this is independent when it is connected as an auto transformer bank. But, since the auto transformer is like a three-winding transformer, the nameplate of the transformer will have illustrated three values of impedances measured with respect to each other (i.e. H-X, H-Y, X-Y). In this case, you have to solve the value of impedance per side of transformer (H, X, Y) because these data are needed in the power flow software. the formula for that is usually written in several excellent texts in power system. In the case of PSS/E, you will have to just input the nameplate parameters and the software engine will solve the required impedances.

[fgm]

Thank's.
I will use the impedance for a 267 MVA in p.u %

[fgm]

double post

[himmelstern]

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[nafamesaoud@hotmail.fr]

thanks himmelstern

[himmelstern]

I found an autotransformer on GIS or geoespatial diagram* for railway applications* it used for etrax module.



and

[user82]

I have autotransformer consisting of 3 single-phase auto transformers 400/220 / 31.5 kV and 267 MVA unit capacity or total capacity of 800 MVA
Modeling it with a 3-Winding Transformer * but I can't understand in the section for "impedance" resistance for a 800 MVA оr for a 267 MVA should I enter?

OK so 3W TX


If LV winding = 800 kva and if Teritry winding = 200 kva then HV winding will = 1000kva (sum) in most cases.
Now you must check impedance Z% from manufacturer nameplate. With Z% and kva you can calculate R* X *X/R ratio.

*very important*: depend on software make sure you calculate above values on correct base power (usually winding kva). I see many mistake from this error.


Edit: i misread your best* what i say above is for three winding transforner* autotransformer might be different.

[himmelstern]