Hello Sir, thank you for a clear and simple explanation. I have a few questions. 1) I found another link for the X/R ratio by SE. This link advises to Calculate Cu losses by formulae "Load losses-No load losses". Is this correct? 2) Considering the explanation in your video, Is it applicable to high-capacity power transformers as well? i.e., 48.2/64.1/80.4 MVA or higher. Request your guidance.
Hey im electrical engineering student, i have question which is , why ETAP don't add no load réactive and active of transformer when i do power flow study But ETAP used them only for unbalanced load . Thanks
Thats how ETAP have created the algorithm.... They have mentioned in the the transformer impedance tap that clearly.... i.e No load current and no load loss are accounted only for unbalanced load flow studies only
please is possible use this percentage(zero sequence impedance) in calculation the fault current in SL-G ? or multiply this value with the Z base to calculate the actual value . pls explain this issue thanks in advance
Sir, I have one doubt, which formula shall I use for R%? R% = Transformer load loss/Transformer rating ×100 Or R% = (Transformer load loss - Transformer no load loss)/ Transformer rating ×100
@@PowerProjects_etap Thank you for sharing. 45 mesc found in IEC 62271, but reference for x/r as 14 not found. Please share the exact page to identify.
Session is useful, many engineers are lacking basis, X/R ratio one such thing! Only suggestion, not to emphasise ETAP or any other software and only focus on basics.
From %Z and X/R find %X xpu = %X / 100 Xact = Zbase * xpu Zbase can be calculated by (Base kV * Base kV ) / Base MVA L = Xact / (2 * Pi * f) Hope this helps
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A heart felt thanks to u sir for disseminating info to all electrical engineers.plz keep posting the videos
I appreciate ur hardwork .
Thanks a lot for wishes. We will keep posting the videos
Good comparison between DIgSILENT & ETAP software for calculating & entering X/R ratio of Transformer ... :)
Nice Explanation always Crisp and Clear...SELVA SIR..Thank you
Thanks and welcome
Content is Valuable..
Thanks for your efforts..
Simple Explanation, thank You.
Very good.. Useful and connects to your basics
Thanks a lot
Hello Sir, thank you for a clear and simple explanation. I have a few questions. 1) I found another link for the X/R ratio by SE. This link advises to Calculate Cu losses by formulae "Load losses-No load losses". Is this correct? 2) Considering the explanation in your video, Is it applicable to high-capacity power transformers as well? i.e., 48.2/64.1/80.4 MVA or higher. Request your guidance.
Good one sir... It is very useful.. expecting a lot of sessions like this sir...
Sure 👍
Very helpful video. Thank you sir
very informative.
Glad it was helpful!
Nice explanation sir
Very useful video. Thank you very much !
Glad it was helpful!
Very useful video sir.
how to calculate X/R ratio for 3 winding transformer? Please upload the video for that one.
Will upload soon
Smart explanation as usual!....Kudos!
Thanks a lot dear!
Continue posting such videos
Thanks
thank you so much sir
Excellent Sir
Many many thanks
Can you tell me where you found this calculation, i need the reference
Transformer Data Sheet, FAT Report and Impedance Triangle
Hey im electrical engineering student, i have question which is , why ETAP don't add no load réactive and active of transformer when i do power flow study
But ETAP used them only for unbalanced load . Thanks
Thats how ETAP have created the algorithm.... They have mentioned in the the transformer impedance tap that clearly.... i.e No load current and no load loss are accounted only for unbalanced load flow studies only
Thanks for your answer
I appreciate that
Gud selva,but in ETAP also directly we will get the x/R ratio
We will get X/R. We can not enter Copper losses directly
please is possible use this percentage(zero sequence impedance) in calculation the fault current in SL-G ? or multiply this value with the Z base to calculate the actual value . pls explain this issue
thanks in advance
Thanks for the feedback. Please refer short circuit video in our channel.
sir can you upload a video regarding x/r ratio calculation or modeling of GRID (utility source)
Please refer our Tech post in Linkedin the below link www.linkedin.com/feed/update/urn:li:activity:6765567504950673408
thank you very much
You are most welcome
Sir, I have one doubt, which formula shall I use for R%?
R% = Transformer load loss/Transformer rating ×100
Or
R% = (Transformer load loss - Transformer no load loss)/ Transformer rating ×100
The one you said is more correct. Read the article below.
www.se.com/eg/en/faqs/FA225849/
Will come with a session shortly
Nice explanation....
Thanks and welcome
Nice sir
Thanks and welcome
Why 14 x/r ratio is used for grid ? Is there any relation with time constant of circuit breaker for that?
X/R - 14 is used for 50 HZ based on 45 ms time constant (IEC 62271). However it is not advisable to use X/R as 14 blindly.
@@PowerProjects_etap Thank you for sharing. 45 mesc found in IEC 62271, but reference for x/r as 14 not found. Please share the exact page to identify.
Session is useful, many engineers are lacking basis, X/R ratio one such thing!
Only suggestion, not to emphasise ETAP or any other software and only focus on basics.
Thanks. Will come up with many many basic videos in upcoming days.
How about 3-winding transformers?
Logic remains same. %R is calculated for HV-LV1, HV-LV2 & LV1-LV2 separately. From there X/R can be calculated.
Helpful
Glad to hear that
Please exaplain same for 3 winding transformer
We will cover in upcoming session
Thanks. How to calculate value of L from %z
From %Z and X/R find %X
xpu = %X / 100
Xact = Zbase * xpu
Zbase can be calculated by (Base kV * Base kV ) / Base MVA
L = Xact / (2 * Pi * f)
Hope this helps
@@PowerProjects_etap yes. Thanks
@@PowerProjects_etap one more question, to find x/r ratio should I use value of R which we measure in DC winding resistance test.
@@avradeepdas1606 It should be Rac at Rated frequency
Power factor