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A question....Transformer ratio ( sqrt (3)/2 ) problem.

A question....Transformer ratio ( sqrt (3)/2 ) problem.

A question....Transformer ratio ( sqrt (3)/2 ) problem.

(OP)

Hello friends,

I have a question...Omicron cpc100 manual says that if you want to test of transformer ratio , you should use following calculationames.

Ratio = ( Vpri / Vsec ) * sqrt (3)/2


But I couldn't understand "sqrt (3)/2" where comes from ?

RE: A question....Transformer ratio ( sqrt (3)/2 ) problem.

That may be for a delta:wye transformer.
To keep it simple consider a Delta:Wye, 480V to 480V isolation transformer. The transformer voltage ratio is 1:1, the secondary winding voltages are 277V
This is a winding ratio of 1:1/sqrt (3) or 1:(1/1.73)
I don't know where the last "2" in the equation comes from unless it refers to footnote #2. Hard to say without some context.
For a delta:delta or for a wye:wye transformer there will be no sqrt (3) term.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: A question....Transformer ratio ( sqrt (3)/2 ) problem.

(OP)
Thanks for ur answer..I know about sqrt3 but..."2" I dont know why we use it...

RE: A question....Transformer ratio ( sqrt (3)/2 ) problem.

I tried to look at the manual on-line. On one site the manual was was for sale, a couple of other sites claimed to offer the manual but I did not trust the sites so no joy.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: A question....Transformer ratio ( sqrt (3)/2 ) problem.

(OP)


Waross and 111R thank you for your interrest.

I understand that constant( sqrt(3)/2 ) with your help...many many THANKS.


sorry for my english.

RE: A question....Transformer ratio ( sqrt (3)/2 ) problem.

My thanks also, 111R.
Yours
Bill

Bill
--------------------
"Why not the best?"
Jimmy Carter

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