[Amps] The transformer rosetta stone

[Rob Atkinson]

KVA is same as KW.   2400 VA is 2400 watts.

think of it as a ratio.  Let's say you have a transformer spec'd at
2000 v. rms 500 ma continuous.

That would be 1 KVA CCS or 1 KW.  the KVA voltage figure doesn't
always mean that's the actual secondary RMS voltage.

73

rob
K5UJ

On Fri, Nov 2, 2012 at 11:40 PM, Gary Smith <Gary at ka1j.com> wrote:
> Something different & something to show how much I don't understand.
>
>
> I'm trying to understand something  about transformers. What the heck
> is the rosetta stone for their nomenclature?
>
> In specific; I learned the original single hole alpha 77DX
> transformer came with a "2.4 KVA CCS" rating. The two hole 77SX
> transformer came with a "4.4 KVA CCS" rated transformer.
>
> OK, so looking at the Dahl specs I see their A77S transformer (one I
> used to have) to be "2800 VAC @ 1.2A CCS". The next higher voltage
> one in the catalog is a A77S-3 which is rated at "3000 VAC at 1.05
> CCS"
>
> For the discussion, the Dahl filled in a lot of air space the
> original transformer left available. There wasn't much room in the
> enclosure once that transformer was seated.
>
> I always thought the KVA came from V x I so if that's the way it is,
> I'm interpreting my old transformer to be 3360 KVA CCS and the other
> Dahl to be 3060 VAC CCS. If that's the case the Dahls have less
> cojones than the stock transformers but I know that's not the case,
> the Dahl was definitely a better performer than the stock transformer
> was.
>
> This isn't making sense to me.
>
> Gary,
> KA1J
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