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Power transformer price vs. size

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ters

Electrical
Nov 24, 2004
247
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?
 
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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
 
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.
 
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.
 
Transformer price = kg*20$ sometimes 20€ differs from country to country and supplier, but generally its price = kg*20$ for new transformer.
 
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