Engineering Simple

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@Reza20003 Ай бұрын

Hi. Thanks a lot for this video! It is extremely helpful. My question is where can I find the theory behind why we need these tests and essentially why we consider a T-model as the zero-sequence network of a transformer? Thanks!

@172vini Ай бұрын

Congratulations

@jojero2009 2 ай бұрын

Thanks for this video! Really helped with some concepts I was struggling with

@faridulislam85329 2 ай бұрын

Wonderful Video

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@anton_c8gur 4 ай бұрын

what is the total % z if parallel?

@kiruthikrs12 4 ай бұрын

HOW DID YOU MARK THE CURRENT DIRECTIONS.?

@engineeringsimple 4 ай бұрын

The choice of current direction is arbitrary. The main thing is to keep the polarity of voltages or direction of current sources in mind while writing KVL and KCL equations. For instance, I chose current flowing from node 2 towards node 0, which is opposite from source with 14 amps so I20=-14 amps. I20 is current flowing from node 2 to node 0. If I chose current as flowing from node 0 into node 2, then I02=+14 amps. I02 is current flowing from node 0 to node 2. Hope this helps.

@VitaliBahdanau-ye8mt 4 ай бұрын

Thank you! Very useful and good explained/delivered information!

@engineeringsimple 4 ай бұрын

Thank you. I am glad it was helpful.

@papuasingo6489 4 ай бұрын

very clear thanks

@engineeringsimple 4 ай бұрын

Thank you.

@phillipyang2872 5 ай бұрын

Thank you for explaining this so simply and easily! I feel like it is finally starting to "click" for me, thank you!

@engineeringsimple 5 ай бұрын

Thank you.

@stevethompson7613 5 ай бұрын

I have watched your series on paralleling transformers and very good explanation . Would you consider doing a video of paralleling transformers with different incoming (e.g., one being 138kV primary and one being 34.5kV primary and both being 13.8kV secondary). Same impedance with different ratios NLTC?

@engineeringsimple 5 ай бұрын

Thank you for the question. One of the conditions for paralleling transformers is to have the same voltage. Any mismatch will lead to circulating currents. Also if two different voltages are connected together, it will exceed insulation withstand of the lowest voltage. Hope this helps.

@CC_Foster 25 күн бұрын

The problem with your ask is not really that the Primary Voltages are different, that is a problem yes... but the issue is going to be that you are describing two diff Primary Sources... the will be out of phase and when you connect those Secondary's... those will be out of phase as well. THAT is going to be bad....If you could phase lock the inputs, you could pull it off. But your ask is to Parallel the outputs ONLY.... So, yeah the Phase issue is very much a problem

@commenter5469 7 ай бұрын

You forgot harmonics

@snoopah3077 7 ай бұрын

In the intro, Are you in an airport runway? Lol

@marschrr 11 ай бұрын

Why the loud music at the begining.. unnecessary =(

@thehopeengineer173 11 ай бұрын

❤good explanation

@kudakwashedzorani7576 11 ай бұрын

What is the vector group of the transformer you used

@engineeringsimple 11 ай бұрын

Typically grounded wye-grounded wye (YNyn0).

@kudakwashedzorani7576 11 ай бұрын

@@engineeringsimple Thank you, what causes measured equivalent losses to be less than total i2r losses, thus making stray losses negative

@AC-my7es 11 ай бұрын

How did you get XL instead of XC? Is it a TYPO?

@engineeringsimple 11 ай бұрын

Thank you for your comment. That is a typo. It should be Xc since the topic is on capacitive load. Thank you again for pointing it out.

@Reza20003 Жыл бұрын

Thanks for sharing your wreath of knowledge with others

@engineeringsimple Жыл бұрын

Thank you.

@No1_Gunslinger Жыл бұрын

This is a good video, I hope you get more viewers

@engineeringsimple Жыл бұрын

Thank you. I appreciate it.

@peergaming4943 Жыл бұрын

Hello Sir, Really informative and very accurate. Can you please give me the book full name

@engineeringsimple 11 ай бұрын

Transformer Engineering A Treatise on the Theory, Operation, and Application of Transformers

@engineeringsimple 11 ай бұрын

Transformer Engineering A Treatise on the Theory, Operation, and Application of Transformers

@SubraMani-s1c Жыл бұрын

Subramani

@sumbarzegaran2817 Жыл бұрын

L-L faults do not result in I0 flow, do they?

@engineeringsimple Жыл бұрын

Thank you for your question. Zero sequence current (I0) only occurs when ground is involved: L-G, L-L-G and unbalanced loading if the neutral is grounded. Thanks.

@MagneManet Жыл бұрын

Thanks for excellent video, just wonder how is the zero sequence impedance of the high side also included in this impedance, for me it looks like only the low side zero sequence impedance is included?

@MagneManet Жыл бұрын

I am thinking that the delta winding has circulating zero sequence currents that must contribute to voltage drop and thereby impedance

@engineeringsimple Жыл бұрын

Thank you for the question. Given this is a delta high side, delta is modeled as open circuit in T-model since it does not have any return through the ground which is where zero sequence flows. Only zero sequence current (I0) is trapped/circulated inside delta. I0 does not leave the delta. It circulates inside the delta since it is a closed loop. Hope this helps.

@prosenjitroyroy2905 Жыл бұрын

Why we applied 125.21 volt and 6.05 amps. How these values are calculated

@yanpetit Жыл бұрын

Correct me if I'm wrong, but it seems like in both resistor and reactor grounding options, it is impossible to maintain an effective grounding system. What would be your suggestion to obtain an effective grounding?

@yanpetit Жыл бұрын

Hello, in your Z0eq equation, where does the 1.02 come from?

@yanpetit Жыл бұрын

I just noticed this question is answered in Sizing Neutral Grounding Reactor or Resistor and Effective Grounding - Part 05. cheers.

@lakshmankameralakshmankame6114 Жыл бұрын

@JonathanFisherS Жыл бұрын

Just wanted to give a thumbs up and a comment for making this video and sharing your knowledge

@engineeringsimple Жыл бұрын

Thank you. I appreciate it.

@dac1287 Жыл бұрын

Nice Tutorial! Any chance I can have your excel spreadsheet template for time management (track your progress)?

@engineeringsimple Жыл бұрын

Thank you. Yes, I will be happy to share it with you. Please send me an email and I will attach it. Thanks.

@indexedb9 Жыл бұрын

A video to calculate a grounding transformer sizing for a DER system would be awsome. The transformer must allow an effectively earthed network and all other IEEE standards.

@engineeringsimple Жыл бұрын

Thank you for the suggestion. I will work on one. I appreciate it.

@srirammandala2986 Жыл бұрын

Thank you

@engineeringsimple Жыл бұрын

You are welcome.

@gavisingh9606 Жыл бұрын

Hlo sir how are you 😊😊

@PapuRam-om1kv Жыл бұрын

Sahi Kaha Tani

@itamorales6580 Жыл бұрын

Thank you, i found the pattern but i didn't know the theory behind it. 3 phase ttr read the larger ratio , i have to divide by 1.5

@jasonhuffine5292 Жыл бұрын

Hi, great video! When calculating reactance, to get 0.5464ohms, the 9.49% has to be divided by 100% to get pu so that the Zbase can be used. With the resistance, this wasn't done, leaving 100.6ohms instead of 1.006ohms. Is that correct?

@engineeringsimple Жыл бұрын

Thank you. You are correct. The percent value should have been divided by 100 when calculating ohms. Instead of 100.6 ohms, it should be 1.006 ohms. Thank you for the catch.

@liamkneeson8866 Жыл бұрын

I love you can I give hug

@ammaraldulaimi3237 Жыл бұрын

What if the Z is in pu, does it make a difference?

@engineeringsimple Жыл бұрын

If you normalize all values (R, Xc), it should not matter. The same ohms base would be used.

@Mithilee Жыл бұрын

Thank you for the informative session. I have a question. It was advised that zero sequence impedance for 3 phase, 3 leg core is 85-90% of positive sequence impedance. I am wondering about the basis for this thumb rule. Is it possible for you to share any literature titles where I can read this part in detail? Request your response.

@engineeringsimple Жыл бұрын

If I remember correctly, I have seen mention of it in IEEE C57 series standards as well as Black Burn text book for protective relaying amongst other references. Personally, I have reviewed many test reports and compared positive and zero sequence impedance values. The ratio of the two always was within 85-90%. The percentage is based on test data.

@Mithilee Жыл бұрын

@@engineeringsimple thank you very much. will refer black burn and IEEE C57.XX for the details.

@uponseas Жыл бұрын

Thank you, sir!

@engineeringsimple Жыл бұрын

You are welcome.

@the_lizardface Жыл бұрын

bussing can you explain this in sequence? explain Bus 1, then explain how and why it relates to bus 2, and then bus 3, and how it makes a ring bus. Then worry about explaining the individual buses

@sudhirsharma3435 Жыл бұрын

You provide a great detail sir, very useful.

@engineeringsimple Жыл бұрын

Thank you.

@dustinblotz8894 Жыл бұрын

At the 8:30 mark you sketch out the SLG fault equivalent circuit. Where do you get the "T-Model" value of 48.49% and the 10.26%?

@engineeringsimple Жыл бұрын

The T-model values would be supplied by the transformer manufacturer either design or tested values.

@dustinblotz8894 Жыл бұрын

@@engineeringsimpleThanks for your response. That is what I was assuming, but wanted to make sure since I hadn't heard those terms before.

@skala1977 Жыл бұрын

Super useful, THANK YOU !!

@engineeringsimple Жыл бұрын

You are welcome.

@skala1977 Жыл бұрын

Great, many thanks !

@engineeringsimple Жыл бұрын

You are welcome!

@emmanuelwemakoy8712 Жыл бұрын

Great explanation!

@engineeringsimple Жыл бұрын

Thank you. I appreciate it.

@philmantjong3905 Жыл бұрын

Would like to mention that when power factor is lagging, it is referring to the current yes? Then in your example could you conclude that is it an inductive system?

@Ryan-sq5lu Жыл бұрын

Many thanks for putting together this video series I was struggling to understand how the applied voltage test would be performed on a Grdy x Grdy transformer, until I saw your diagrams showing the HO getting shorted along with the primary.

@engineeringsimple Жыл бұрын

You are welcome. I am glad the video was helpful.

@IGKHALIL Жыл бұрын

Pm be multiplied with the bracket, probably

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