Transformer Regulation Homework: Hughes Electrical Book

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Discussion Overview

The discussion revolves around a homework problem related to transformer regulation, specifically using equations from the Hughes electrical book. Participants are seeking clarification and validation of their approaches and calculations.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses confidence in their use of equations from the Hughes electrical book but admits uncertainty and seeks advice on their correctness.
  • Another participant confirms the correctness of part a of the homework and provides guidance on calculating the primary rated current for part b, suggesting a specific formula involving the square root of three.
  • A participant questions the necessity of dividing by the square root of three in the context of the calculations.
  • There is a clarification sought regarding whether R refers to equivalent resistance as referred to the primary side.
  • Participants engage in a back-and-forth to confirm the correctness of the calculations and adjustments suggested.

Areas of Agreement / Disagreement

There is some agreement on the correctness of part a, but the discussion includes multiple viewpoints on the calculations for part b, indicating that the topic remains somewhat contested and unresolved.

Contextual Notes

Participants reference specific calculations and adjustments, but the discussion does not resolve the underlying assumptions or the complete mathematical steps involved in the transformer regulation problem.

Who May Find This Useful

Students and individuals studying transformer regulation, electrical engineering concepts, or those seeking assistance with similar homework problems may find this discussion relevant.

billyray
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Homework Statement


upload_2018-3-11_20-38-40.png
[/B]

Homework Equations


I have used the Hughes electrical book for the equations to solve the above. I have very little notes from college to help. I have found these equations fit and am confident on it but not 100% can anyone who knows transformers please advise if they think i am right or wrong on the equations. i am finding it hard but have done my best.

The Attempt at a Solution


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The a part it is correct. Part b 2% of 415 is o.k. but in the regulation equation you have to employ the primary rated current: 200x1000/sqrt(3)/415. When you'll find R subtract 0.01 and this will be the added resistance at primary side[415 V].Then you have to calculate this resistance as if it is at secondary side.
 
how comes I need to divide 200x 1000 by square route of three?
 
Do you mean R as equivalent resistance referred to primary?
 
is this better?
 

Attachments

o.k.
 
you mean its correct?
 
yes.
 
Thanks so much Babadag

I like your cat by the way.
 
  • #10
Thank you, billyray. My cat is called Pitsush. She is 10 years old and very intelligent
 

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