[Amps] Transformer material weight

[Manfred Mornhinweg]

Randy,

> Question about transformers .. 
> If I was to buy the laminates and wire to wind
> a 2 KVA transformer and say it weighed 50 lbs.
> What would be a good guess for how much of that
> was iron and how much copper ..?? 

The designer has some degree of freedom to trade copper for iron, and 
the decision will affect the performance of the transformer in the way 
of making it better suited for continuous high load, or for lots of 
idling time at low load. But a typical distribution for a modern 
transformer might be roughly 20% copper, 80% iron. The other materials 
have a negligible weight.

Old transformers, designed in times when copper wasn't as expensive as 
it is now, typically had more copper, maybe 30%.

Manfred.

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