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ABB: Improving a Project’s Rate of Return
08.09.2011 + + + When the Department of Energy enacted the national efficiency standard for distribution-class transformers up to 2,500 kVA in 2010 (72 CFR 58190), it excluded Generator Step-Up (GSU) units. This was unfortunate because the industry continues to construct wind-collector networks with sub-optimal GSU transformers which lead to lower overall collector efficiencies, lower kWh sales, and longer project paybacks. The oversight ignores significant developments in GSU transformers that can alleviate such
problems.
In the last year, ABB introduced a line of liquid (green cabinet) and dry type distribution-class transformers with amorphous-metal cores that significantly reduce no-load losses. EcoDry and Green-R-Pad transformers provide an optimal solution for applications in which average loadings are below 50% of nameplate rating.
Transformers financials 101
Every wind turbine has a GSU transformer stepping up the generator-output voltage from 690 to 34,500 volts. The transformer can be installed alongside the generator in the nacelle, or inside or outside the tower. Transformers inside the nacelle or tower can either be dry or liquid. Outside the tower, they have been liquid filled and pad mounted. The turbine OEM usually specifies and delivers the transformer, otherwise, it’s specified by the EPC or contractor. The OEM, EPC, or contractor delivers the specified efficiency. What the site’s owner and operator does not know is that GSU transformer efficiencies could be raised for a nominal additional capital outlay. Improved collector efficiencies lead to faster project payback and increased return on investment > Full article
Source ABB
Published July 21 by Windpower Engineering
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