[Amps] The transformer rosetta stone

[Gary Smith]

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