The efficiency of a TIER2 Ecodesign transformer will depend on its size and type. The TIER2 Ecodesign norm establishes minimum efficiency levels for different classes of transformers, and the specific efficiency requirements will vary depending on the class of transformer.
For example, the minimum efficiency levels for distribution transformers are as follows:
For transformers with a rated power of less than or equal to 315 kVA, the minimum efficiency level is 98.5% at a load of 50%
For transformers with a rated power of greater than 315 kVA and less than or equal to 500 kVA, the minimum efficiency level is 98.2% at a load of 75%
For transformers with a rated power of greater than 500 kVA, the minimum efficiency level is 97.5% at a load of 75%
These are the minimum efficiency levels that a TIER2 Ecodesign transformer must meet in order to be compliant with the norm. However, some transformers may be more efficient than these minimum levels, depending on their design and the materials and components used to build them.
In summary, the efficiency of a TIER2 Ecodesign transformer will vary depending on its size and type, but it must meet minimum efficiency levels that are established by the TIER2 Ecodesign norm.