# Commission Regulation (EU) No 548/2014 of 21 May 2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers, Division 2: Minimum energy efficiency requirements for large power transformers

Extent: E+W+S+N.I.

Minimum efficiency requirements for large power transformers are set out in Tables I.7, I.8 and I.9.
There may be specific instances where the replacement of an existing transformer, or the installation of a new one, meeting the applicable minimum requirements set out in Tables I.7, I.8 and I.9 would result in disproportionate costs. As general rule, costs can be considered to be disproportionate when the extra transportation and/or installation costs of a Tier 2 or Tier 1, as applicable, compliant transformer would be higher than the net present value of the additional avoided electricity losses (tariffs, taxes and levies excluded) over its normally expected service life. This net present value shall be calculated based on capitalised loss values using widely accepted social discount rates .
In those cases, the following fall-back provisions apply:
As of the date of application of Tier 2 requirements ( 1 July 2021 ), when the one-to-one replacement of a large power transformers in an existing site entails disproportionate costs associated to its transportation and/or installation, or is technically infeasible, the replacement transformer is, exceptionally, only required to comply with Tier 1 requirements for the given rated power.
Furthermore, if the cost of installing a replacement transformer complying with Tier 1 requirements are also disproportionate, or where no technically feasible solutions exist, no minimum requirements shall apply to the replacement transformer.
As of the date of application of Tier 2 requirements ( 1 July 2021 ), when the installation of a new large power transformer in a new site entails disproportionate costs associated to their transportation and/or installation, or is technically infeasible, the new transformer is, exceptionally, only required to meet Tier 1 requirements for the given rated power.
In these cases, the manufacturer, importer or authorised representative responsible for placing on the market or putting into service the transformer shall:
include in the technical documentation of the new or replacement transformer the following information:
address and contact details of the commissioner of the transformer,
the specific location where the transformer is to be installed,
the technical and/or economic justification to install a new or replacement transformer that does not comply with Tier 2 or Tier 1 requirements. If the transformer(s) were commissioned by a tendering process, all the necessary information regarding the analysis of bids and the award decision, shall also be provided,
notify the competent national market surveillance authorities.
Table I.7
Minimum Peak Efficiency Index requirements for liquid immersed large power transformers
Rated Power (MVA)
Tier 1 ( 1.7.2015 )
Tier 2 ( 1.7.2021 )
Minimum Peak Efficiency Index (%)
≤ 0,025
97,742
98,251
0,05
98,584
98,891
0,1
98,867
99,093
0,16
99,012
99,191
0,25
99,112
99,283
0,315
99,154
99,320
0,4
99,209
99,369
0,5
99,247
99,398
0,63
99,295
99,437
0,8
99,343
99,473
1
99,360
99,484
1,25
99,418
99,487
1,6
99,424
99,494
2
99,426
99,502
2,5
99,441
99,514
3,15
99,444
99,518
4
99,465
99,532
5
99,483
99,548
6,3
99,510
99,571
8
99,535
99,593
10
99,560
99,615
12,5
99,588
99,640
16
99,615
99,663
20
99,639
99,684
25
99,657
99,700
31,5
99,671
99,712
40
99,684
99,724
50
99,696
99,734
63
99,709
99,745
80
99,723
99,758
100
99,737
99,770
125
99,737
99,780
160
99,737
99,790
≥ 200
99,737
99,797
Minimum PEI values for MVA ratings that fall in between the ratings given in Table I.7 shall be calculated by linear interpolation
Table I.8
Minimum Peak Efficiency Index requirements for dry-type large power transformers with Um ≤ 36kV
Rated Power (MVA)
Tier 1 ( 1.7.2015 )
Tier 2 ( 1.7.2021 )
Minimum Peak Efficiency Index (%)
3,15 < Sr ≤ 4
99,348
99,382
5
99,354
99,387
6,3
99,356
99,389
8
99,357
99,390
≥ 10
99,357
99,390
Minimum PEI values for MVA ratings that fall in between the ratings given in Table I.8 shall be calculated by linear interpolation
Table I.9
Minimum Peak Efficiency Index requirements for dry-type large power transformers with Um > 36kV
Rated Power (MVA)
Tier 1 ( 1.7.2015 )
Tier 2 ( 1.7.2021 )
Minimum Peak Efficiency Index (%)
≤ 0,05
96,174
96,590
0,1
97,514
97,790
0,16
97,792
98,016
0,25
98,155
98,345
0,4
98,334
98,570
0,63
98,494
98,619
0,8
98,677
98,745
1
98,775
98,837
1,25
98,832
98,892
1,6
98,903
98,960
2
98,942
98,996
2,5
98,933
99,045
3,15
99,048
99,097
4
99,158
99,225
5
99,200
99,265
6,3
99,242
99,303
8
99,298
99,356
10
99,330
99,385
12,5
99,370
99,422
16
99,416
99,464
20
99,468
99,513
25
99,521
99,564
31,5
99,551
99,592
40
99,567
99,607
50
99,585
99,623
≥ 63
99,590
99,626
Minimum PEI values for MVA ratings that fall in between the ratings given in Table I.9 shall be calculated by linear interpolation.

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Source: https://www.legislation.gov.uk/eur/2014/548/annex/I/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-548/annex-I/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.