Full-load losses at 100% rated current = 4000W.
•
Further, in our example, the manufacturer has bid $24,000 as the delivered price of the transformer. The utility evaluating the transformer has provided the annual cost of losses to be:
No-Load Losses = $4.50/Watt Full-Load Losses = $2.00/Watt
The utility’s practice is to evaluate their total cost of ownership (TCO) over a three-year period. Using
this information, we can determine TCO. From above we have the cost equation: 𝑇𝑇 𝑇𝑇 𝑇𝑇 = 𝑇𝑇 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑇𝑇𝑇𝑇 𝑇𝑇
𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝ℎ𝑎𝑎𝑎𝑎𝑎𝑎 𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 + ൣ 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸 𝐸𝐸𝐸𝐸 𝐸𝐸𝐸𝐸𝐸𝐸 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 𝑃𝑃𝑃𝑃 𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌 ∗ ൫ ( 𝑁𝑁𝑁𝑁𝑁𝑁 ∗ 𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁 ) +( 𝐹𝐹𝐹𝐹𝐹𝐹 ∗ 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹 ) ൯൧
Where: 𝑇𝑇 𝑇𝑇 𝑇𝑇
is the total cost of ownership over a specific
number of years. 𝑇𝑇 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑇𝑇𝑇𝑇 𝑇𝑇
𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝ℎ𝑎𝑎𝑎𝑎𝑎𝑎 𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 is the initial transformer
purchase price including any shipping cost.
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