Annex IV Indicative Benchmarks

At the time of adoption of this Regulation, the best available technology on the market for medium power transformers was identified as follows:

1. (a)

   Liquid-immersed medium power transformers: A_o – 20 %, A_k – 20 %

2. (b)

   Dry-type medium power transformers: A_o – 20 %, A_k – 20 %

3. (c)

   F1Medium power transformers with amorphous steel core: Ao-50 %, Ak.

The availability of material to manufacture transformers with amorphous steel core needs further development, before such values of losses can be considered to become minimum requirements in the future.