Power transformer price vs. size

[ters]

Is there an approximate formula dealing with relationship between transformer price and its size? For example, assume two transformers of identical make, purpose, features, cooling and design, A rated 80 MVA while B is 120 MVA. Since the relationship between power output and qty of iron, copper, oil, etc, does not appear to be exactly linear (50% more power does not necessarily mean 50% more material) can one use an approximate formula to estimate budgetary cost of transformer B, if the price of transformer A is already known?

 

[unclebob]

One formula a peddler (working for a private transformer shop) gave me:

Transformer size versus Value:

They buy Old Transformers 1.00$ / KVa
They sell them refurbished for 10.00$ / KVa
They sell new tranformers 20.00$ / Kva , accessories not included

 

[prc]

Active materials in a transformer varies as the MVA raised to 0.75. When considering the labour cost also, price will be varying as MVA raised to 0.7-0.8,depending on the weightage of labour content.

 

[tinfoil]

1) Ask a mfr for a quote. They are usually happy to give out quick 'budget' numbers.

2) Alternatively, I would assume roughly one-third to one-half of the cost is fixed, and the rest linear with size. On a larger unit such as your 80MVA unit, its probably more like 20 to 25% is fixed.

The logic here is that they have to do about the same about of quoting, engineering, layout, and setup, regardless of xmfr size.

 

[sslobodan]

Transformer price = kg*20$ sometimes 20€ differs from country to country and supplier, but generally its price = kg*20$ for new transformer.