transformer info

[steve]

hi

can anybody help ?

I'm doing some measurements on assorted power transformers (3VA to 100VA) and
am wondering what the general term is for the difference in output voltage
between no load and full load conditions. Probably expressed as a percentage.

Steve

 

[Don Kelly]

----------------------------
"steve" <aka.durins.bane@googlemail.com> wrote in message
news:MPG.224ba6fe233365bf989688@news.freedom2surf.net...

hi

can anybody help ?

I'm doing some measurements on assorted power transformers (3VA to 100VA)
and
am wondering what the general term is for the difference in output voltage
between no load and full load conditions. Probably expressed as a
percentage.

Steve
-----------------

It is called voltage regulation. When specifying it you should also indicate
the power factor as that will have a considerable effect.

VR =(no-load voltage magnitude-full load voltage magnitude)/full load
voltage magnitude as a %
Full load voltage is nominally rated voltage and, strictly speaking, the
tests should be at rated output voltage and load KVA.

--

Don Kelly dhky@shawcross.ca
remove the X to answer

 

[steve]

In article <pFhEj.96639$w94.36741@pd7urf2no>, dhky@shaw.ca says...

----------------------------
"steve" <aka.durins.bane@googlemail.com> wrote in message
news:MPG.224ba6fe233365bf989688@news.freedom2surf.net...
hi

can anybody help ?

I'm doing some measurements on assorted power transformers (3VA to 100VA)
and
am wondering what the general term is for the difference in output voltage
between no load and full load conditions. Probably expressed as a
percentage.

Steve
-----------------
It is called voltage regulation. When specifying it you should also indicate
the power factor as that will have a considerable effect.

VR =(no-load voltage magnitude-full load voltage magnitude)/full load
voltage magnitude as a %
Full load voltage is nominally rated voltage and, strictly speaking, the
tests should be at rated output voltage and load KVA.


right, that covers it nicely. Pretty much what I had in mind. I was wondering

if there was a more colloquial term for it (something like 'bloat'). Thanks
for the reminder about power factor, I hadn't connected it with voltage
regulation. I expect there is a correlation with efficiency also, tho' I;ve
not explored it yet. I covered all the theory many years ago, but as I've
never had to work with transformers before it makes for an interesting
exercise.

Steve