Division 1.2 Requirements for medium power transformers with rated power > 3 150 kVA

United Kingdom

Table I.4: Minimum Peak Efficiency Index (PEI) values for liquid immersed medium power transformers

Rated Power (kVA)	Tier 1 (1 July 2015)	Tier 2 (1 July 2021)
Rated Power (kVA)	Minimum Peak Efficiency Index (%)
3 150 < S_r ≤ 4 000	99,465	99,532
5 000	99,483	99,548
6 300	99,510	99,571
8 000	99,535	99,593
10 000	99,560	99,615
12 500	99,588	99,640
16 000	99,615	99,663
20 000	99,639	99,684
25 000	99,657	99,700
31 500	99,671	99,712
40 000	99,684	99,724

Minimum PEI values for kVA ratings that fall in between the ratings given in Table I.4 shall be calculated by linear interpolation.

Table I.5: Minimum Peak Efficiency Index (PEI) values for dry type medium power transformers

Rated Power (kVA)	Tier 1 (1 July 2015)	Tier 2 (1 July 2021)
Rated Power (kVA)	Minimum Peak Efficiency Index (%)
3 150 < S_r ≤ 4 000	99,348	99,382
5 000	99,354	99,387
6 300	99,356	99,389
8 000	99,357	99,390
≥ 10 000	99,357	99,390

Minimum PEI values for kVA ratings that fall in between the ratings given in Table I.5 shall be calculated by linear interpolation.

Notes on Division 1

F1: Inserted by Commission Regulation (EU) 2019/1783 of 1 October 2019 amending Regulation (EU) No 548/2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers (Text with EEA relevance).

f1

The European Commission Better Regulation Toolbox suggest using a value of 4 % for the social discount rate

https://ec.europa.eu/info/sites/info/files/file_import/better-regulation-toolbox-61_en_0.pdf