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Old 03-21-2017, 09:39 PM   #1
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Default Transformer internal wiring question

Out of 80 questions that have been incredibly difficult, I'm down to 1 last question and as much as I've looked over it and have tried drawing it out, its got me stumped! I almost feel like none of them are correct based on the way the connections are. The only one that makes any sense at all to me is III.



The reason I say III is because that is the only one where the Neutral is connected for a Wye system. The other ones make no sense to me, although I guess I don't know a whole lot about this stuff. We have to read over 50 pages and I swear no where does it talk about this at all, its just a random question thrown into the homework... **** I hate posting a homework question but I'm ready to learn, not just get an answer. My goal is to learn, sorry for posting homework but I'm totally stuck and I'm too stubborn to just guess.. Also it defeats the purpose of school. Thanks for your help
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Old 03-21-2017, 10:34 PM   #2
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III is most certainly a neutral, this is a basic standard Y connection.

II is also a neutral, this is a ∆ system with one transformer center-tapped for the neutral. Phase B is the high leg.

I has no neutral, it is a 3 3 wire grounded B system.
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Last edited by micromind; 03-22-2017 at 12:28 AM.
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Old 03-21-2017, 10:55 PM   #3
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Answer ended up not being C, thanks for your help though! I got III as a Y connection but the others had me stumped. Assumed they were Delta but unsure if they were correctly connected. So maybe B is the correct answer, sense I has no neutral. Idk these questions are just silly, sort of annoyed by a question like this, you just can't win...
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Old 03-21-2017, 11:10 PM   #4
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for I ... because they show 'to grounding electrode' , it is a corner grounded delta.
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Old 03-21-2017, 11:21 PM   #5
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The answer is "C."

So typical.

Corner grounded delta ( 240, 240, 0 )
Center tapped delta (480::240/120)
Classic delta-wye transformer (480::208Y120)
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Old 03-21-2017, 11:22 PM   #6
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I'm starting to worry about you.
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Old 03-21-2017, 11:26 PM   #7
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Quote:
Originally Posted by telsa View Post
The answer is "C."

So typical.

Corner grounded delta ( 240, 240, 0 )
Center tapped delta (480::240/120)
Classic delta-wye transformer (480::208Y120)
I thought so too But got it incorrect
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Old 03-22-2017, 12:23 AM   #8
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But you learned why you got it wrong.

You learned something about neutrals today, that knowledge will be needed somewhere down the line.

Too often, our society looks at the end result while ignoring the journey to get there. When you know why something is the way it is, then you've mastered it.

In about the 4rd grade, I came to the conclusion that people who could figure things out were smarter (and more valuable) than those who simply knew the answer. This knowledge has served me pretty well over the last half-century.
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Old 03-22-2017, 12:24 AM   #9
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So you are telling these guys it is wrong but you will not tell them what the answer is you got from class.
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Old 03-22-2017, 12:33 AM   #10
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I think the answer is b. Connection I doesn't have a neutral, it's a corner grounded delta. Only II and III have neutrals, so the answer is b, not c.
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Old 03-22-2017, 05:00 PM   #11
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Quote:
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So you are telling these guys it is wrong but you will not tell them what the answer is you got from class.
Sorry the correct answer is B. I just don't really like the question :/. Because all 3 diagrams are correctly drawn, that's why I put C as my answer.
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Old 03-22-2017, 05:10 PM   #12
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Quote:
Originally Posted by JasonCo View Post
Sorry the correct answer is B. I just don't really like the question :/. Because all 3 diagrams are correctly drawn, that's why I put C as my answer.
Yes, All 3 diagrams are valid Xformer connections !

The question was which ones are valid Neutrals.

Only 2 and 3 were valid neutrals
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