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How 2 determin Unknown Xfrmr VA Rating?
How 2 determin Unknown Xfrmr VA Rating?
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Old 22nd September 2004, 04:04 PM   #11
Jocko Homo is offline Jocko Homo  United States
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I suspect that our friend wants us to do all the work for him...........

Jocko
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Old 22nd September 2004, 04:26 PM   #12
Zero Cool is offline Zero Cool  United States
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Ummm No....

But i was hoping to find a more definitive answer and so far all i have gotten is how to guess. if thats all there is, then thats all there is.

I was hoping someone would say something like:

apply a variable load to the transformer and when you reach X% of drop then your at max VA.

Or,

Apply a load and Monitor Tempurature rise over time and if the core reaches Xdegress in X Minutes then your at max VA.


OR something similar that is closer then a guess.


No problem, if there is no such formula.
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Old 22nd September 2004, 05:56 PM   #13
Jocko Homo is offline Jocko Homo  United States
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That isn't how transformers are designed. Or how to evaluate them. No one that I know would suggest such methods, as they are almost meaningless.

The "guesses" that we supplied are more than adequate to do what needs to be done.

Jocko
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Old 23rd September 2004, 07:01 AM   #14
gmphadte is offline gmphadte  India
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Default efficiency

Transformer efficiency is about 98%...

Just a clue...

However, i am not sure how it can be used

Gajanan Phadte
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Old 24th September 2004, 11:44 AM   #15
djk is offline djk
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" That isn't how transformers are designed. Or how to evaluate them. No one that I know would suggest such methods, as they are almost meaningless."

I've got five minutes, tell me all you know about transformers.

My first paid position in electronics was in large transformer and motor repair, the subject is a lot more complicated that you think, and yet quite simple at the same time.

"I was hoping someone would say something like:
apply a variable load to the transformer and when you reach X% of drop then your at max VA."

What in the world do you think:

"Look up the regulation spec for that VA size, load the transformer until the voltage drops by that amount."

MEANS?
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