Previous in Forum: Minimum Energy Configuration for Free-to-move Magnets   Next in Forum: Proximity Switches for a Bin Level Switch
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
16 comments
Rate Comments: Nested
vanessa
Member

Join Date: Nov 2011
Posts: 6

Transformer Data

11/26/2011 7:36 PM

Dear Electrical Experts,

I am an Interior Design program student, on the course we are required to found info and fillin the form of transformer testing & commissioning record for one project. please help me and provide me a standard measurements for the primary and secondary of Vab, Vbc, Vca. further details: it is 75 kva, primary current of 600v and second voltage of 208/120v

I had search around the web for view days, but since I am not totally interest on it, those formulas makes me nuts...

With Regards

Vanessa
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: transformer data

11/26/2011 7:49 PM

I'd find something I was, "totally interest on it".

"Those formulas makes me nuts", too.
Register to Reply
2
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#2

Re: transformer data

11/26/2011 8:11 PM

For 75 kva and 600v primary (line to line), the current should be ~72.2a.

In the secondary side, Vab/Vbc/Vca are the three line-to-line voltages of 208, and they should be equal within about 5%, the closer the better. The corresponding current would be ~208.2a. The phase (line-to-neutral) voltages Van/Vbn/Vcn are 120. These too should be nearly equal. If not, there some unbalanced loads on the various phases.

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply Good Answer (Score 2)
Go to Next Good Answer
vanessa
Member

Join Date: Nov 2011
Posts: 6
#4
In reply to #2

Re: transformer data

11/26/2011 8:40 PM

please also tell me the Vab/Vbc/Vca and Van/Vbn/Vcn for primary.

thank you
Register to Reply
2
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#7
In reply to #4

Re: transformer data

11/26/2011 8:53 PM

Primary Vab ≈ Vbc ≈ Vca ≈ 600v. The primary may or may not have a neutral, but if it does, Van ≈ Vbn ≈ Vcn ≈ 346v (600/√3). [All "equalities" are approximate, owing to possible load imbalances and line losses.]

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply Good Answer (Score 2)
No more Good Answers. Go to first "Almost" Good Answer
vanessa
Member

Join Date: Nov 2011
Posts: 6
#9
In reply to #7

Re: transformer data

11/26/2011 9:30 PM

Thank you for your time, I will use these numbers and with all the info that I found before, and try my best to understand how everything goes together.

appreciate for your help.
Register to Reply
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#10
In reply to #9

Re: transformer data

11/26/2011 9:40 PM

Welcome to the forum, by the way. Your questions are good, and if you stick around, you can learn a lot. (Even if it is rather piecemeal over many postings and threads.)

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#13
In reply to #7

Re: transformer data

11/27/2011 9:52 AM

GA. I particularly like the load imbalance addition.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Off Topic (Score 5)
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#3

Re: transformer data

11/26/2011 8:33 PM

Interior design ? ? ? ? ?

I really can't imagine a transformer with flock wallpaper inside the housing. The oil would spoil it.

One of the more bizarre ways of asking a homework question.

__________________
 The reports of my death are greatly exaggerated.
Register to Reply Score 1 for Off Topic
vanessa
Member

Join Date: Nov 2011
Posts: 6
#5
In reply to #3

Re: transformer data

11/26/2011 8:43 PM

interior design is not only housing design, it is for both commercial and residential/
Register to Reply
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#6
In reply to #5

Re: transformer data

11/26/2011 8:49 PM

Take this how you like but I don't believe you.

The information is readily available and as you admit it's homework, you should do it yourself.

__________________
 The reports of my death are greatly exaggerated.
Register to Reply Score 1 for Off Topic
vanessa
Member

Join Date: Nov 2011
Posts: 6
#8
In reply to #6

Re: transformer data

11/26/2011 8:54 PM

yes, I know that,

thank you anyway.
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#11
In reply to #6

Re: transformer data

11/27/2011 1:17 AM

As you've probably seen many times lately, I've been very harsh on truly lazy students. But I think Vanessa has made a well composed beginners question here. She (I presume from the handle) is looking outside of her scholastic field of study and as such usually has little need to understand our shorthand notation systems or mathematics. IMHO these types of questions should be encouraged instead of discouraged. Who here hasn't had a momentary lapse of the meaning of our own jargon as we were learning it. So cut her some slack. She's being up front and honest about her background. She's also showing that she's already succeeding in doing some of her homework by using the correct terms.

Having said that, I do have a critical message for Vanessa. I expect that you have a good respect for many of the electrical hazards downstream of your step down transformer (the 208/120V side). I warn you though that the electrical hazards on the upstream side (600V) of this transformer are considerably higher than you might think. This area is nowhere for a novice to learn about power distribution, unsupervised. Do not remove any panels of a transformer fed from a 600V power feed.

Welcome to CR4, Vanessa.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
kvsridhar
Guru
India - Member - New Member

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
Good Answers: 164
#12
In reply to #11

Re: transformer data

11/27/2011 3:40 AM

GA to you redfred ... a very good response....i may add 'as usual'.

__________________
 Nothing worthwhile can ever be taught, it can only be learnt.
Register to Reply Off Topic (Score 5)
vanessa
Member

Join Date: Nov 2011
Posts: 6
#14
In reply to #11

Re: transformer data

11/27/2011 6:28 PM

Thank you for your understanding and feedback,

truly appreciate for all of your helps.

regards,

Vanessa
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#15
In reply to #14

Re: transformer data

11/27/2011 9:21 PM

You're very welcome. I look forward to both your next question and for when I or somebody else asks a question in your realm for your well reasoned advice.

Again, welcome to CR4.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Off Topic (Score 4)
Anonymous Poster #1
#16

Re: Transformer Data

12/11/2011 12:26 PM

For those "Gurus", who posted the answers... doesn't it looks like a homework question

aww...u r very kind and cute when answering to female questioners...
Register to Reply
Register to Reply
Have a Different Question?
16 comments

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); kvsridhar (1); lyn (1); redfred (3); TonyS (2); Tornado (3); vanessa (5)

Previous in Forum: Minimum Energy Configuration for Free-to-move Magnets   Next in Forum: Proximity Switches for a Bin Level Switch

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (100 right now)
Show Members
Advertisement