Article: Transformer Turns Ratio (TTR) Explained

[testguy]

You can view the page at http://testguy.net/content/246-Trans...TTR)-Explained

[kimvanov]

Nice article

[mildtuna]

Some good information here

[Js20981]

So using example in the article a 3ph delta wye 138000-12470/7200 the formula would be 138000÷7200?

[joeldjiogo]

So using example in the article a 3ph delta wye 138000-12470/7200 the formula would be 138000÷7200?

Yes Sir... In Y configuration Vline=sqr(3)*Vphase. And since your 138000v in Delta represents the phase and the line Vline=Vphase, 12470 VLine/Sqr(3)=7200v of Vphase should be used. i hope it helps

[RGarcia]

What is the turns ratio of a 3-phase 500kVA, 13,200-480 volt rated delta-delta transformer that is 80% loaded?

I cant seem to wrap my head around the calculation on this, can someone assist me on it. I keep getting 22 cause I add the 80% load into my calculation