CELEX ID: 32014R0548

--- ENGLISH ---

Document:
22.5.2014
EN
Official Journal of the European Union
L 152/1
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
THE EUROPEAN COMMISSION,
Having regard to the Treaty on the Functioning of the European Union,
Having regard to Directive 2009/125/EC of the European Parliament and of the Council of 21 October 2009 establishing a framework for the setting of ecodesign requirements for energy-related products 
(
1
)
, and in particular Article 15(1) thereof,
After consulting the Ecodesign Consultation Forum,
Whereas:
(1)
The Commission has carried out a preparatory study that analysed the environmental and economic aspects of transformers. The study was developed together with stakeholders and interested parties from the Union and the results have been have made publicly available. Transformers are considered as energy related products within the meaning of Article 2(1) of Directive 2009/125/EC.
(2)
The study showed that energy in the use phase is the most significant environmental aspect that can be addressed through product design. Significant amounts of raw materials (copper, iron, resin, aluminium) are used in the manufacturing of transformers, but market mechanisms seem to be ensuring an adequate end-of-life treatment, and therefore it is not necessary to establish related ecodesign requirements.
(3)
Ecodesign requirements set out in Annex I apply to products placed on the market or put into service wherever they are installed. Therefore such requirements cannot be made dependant on the application in which the product is used.
(4)
Transformers are usually purchased under framework agreements. In this context, purchase refers to the act of contracting with the manufacturer for the delivery of a given volume of transformers. The contract is deemed to have come into force on the date of signature by the parties.
(5)
Certain categories of transformers should not be covered by this Regulation, due to their specific function,. The energy consumption and saving potential of such transformers is negligible compared to other transformers.
(6)
Regulatory concessions are granted because of the weight limitations for mounting transformers on utility poles. In order to avoid misuse of transformers specifically manufactured for pole-mounted operation, they should include a visible display ‘For pole-mounted operation only’, so as to facilitate the work of national market surveillance authorities.
(7)
Regulatory concessions are granted to transformers equipped with equipment capable of performing voltage regulation functions to integrate distributed generation from renewable sources into the distribution grid. Such concessions should gradually be phased out as this emerging technology matures and measurement standards become available to separate the losses associated to the core transformer from those associated to the equipment performing additional functions.
(8)
Ecodesign requirements for the energy performance/efficiency of medium power transformers and for the energy efficiency of large power transformers should be set with a view to harmonising ecodesign requirements for these devices throughout the Union. Such requirements would also contribute to the efficient functioning of the internal market and to improving Member States' environmental performance.
(9)
Establishment of ecodesign requirements for medium and large power transformers is also necessary to increase the market penetration of technologies and design options improving their energy performance or efficiency. Total losses of the transformers fleet in the EU27 in 2008 amounted to 93,4 TWh per year. The cost-effective improvement potential through more efficient design has been estimated in about 16,2 TWh per year in 2025, which corresponds to 3,7 Mt of CO
2
 emissions.
(10)
It is necessary to provide for a staged entry into force of the ecodesign requirements in order to provide an appropriate timeframe for manufacturers to redesign their products. Time limits for the implementation of those requirements should be set taking into account impacts on the costs for manufacturers, in particular small and medium size enterprises, while ensuring timely achievement of the policy objectives.
(11)
To allow an effective implementation of the regulation, National Regulating Authorities are strongly advised to take account of the effect of minimum efficiency requirements on the initial cost of the transformer and to allow for the installation of more efficient transformers than the regulation requires, whenever these are economically justified on a whole life cycle basis, including an adequate evaluation of losses reduction.
(12)
To facilitate compliance checks, manufacturers should be asked to provide information in the technical documentation referred to in Annexes IV and V to Directive 2009/125/EC.
(13)
The measures provided for in this Regulation are in accordance with the opinion of the Committee established by Article 19(1) of Directive 2009/125/EC,
HAS ADOPTED THIS REGULATION:
Article 1
Subject matter and scope
1.   This Regulation establishes ecodesign requirements for placing on the market or putting into service power transformers with a minimum power rating of 1 kVA used in 50 Hz electricity transmission and distribution networks or for industrial applications. The Regulation is only applicable to transformers purchased after the entry into force of the Regulation.
2.   This Regulation shall not apply to transformers specifically designed and used for the following applications:
—
instrument transformers, specifically designed to supply measuring instruments, meters, relays and other similar apparatus,
—
transformers with low-voltage windings specifically designed for use with rectifiers to provide a DC supply,
—
transformers specifically designed to be directly connected to a furnace,
—
transformers specifically designed for offshore applications and floating offshore applications,
—
transformers specially designed for emergency installations,
—
transformers and auto-transformers specifically designed for railway feeding systems,
—
earthing or grounding transformers, this is, three-phase transformers intended to provide a neutral point for system grounding purposes,
—
traction transformers mounted on rolling stock, this is, transformers connected to an AC or DC contact line, directly or through a converter, used in fixed installations of railway applications,
—
starting transformers, specifically designed for starting three-phase induction motors so as to eliminate supply voltage dips,
—
testing transformers, specifically designed to be used in a circuit to produce a specific voltage or current for the purpose of testing electrical equipment,
—
welding transformers, specifically designed for use in arc welding equipment or resistance welding equipment,
—
transformers specifically designed for explosion-proof and underground mining applications 
(
2
)
,
—
transformers specifically designed for deep water (submerged) applications,
—
medium Voltage (MV) to Medium Voltage (MV) interface transformers up to 5 MVA,
—
large power transformers where it is demonstrated that for a particular application, technically feasible alternatives are not available to meet the minimum efficiency requirements set out by this Regulation,
—
large power transformers which are like for like replacements in the same physical location/installation for existing large power transformers, where this replacement cannot be achieved without entailing disproportionate costs associated to their transportation and/or installation,
except as regards the product information requirements and technical documentation set out in Annex I, points 3 and 4.
Article 2
Definitions
For the purpose of this Regulation and its annexes the following definitions shall apply.
(1)
‘Power transformer’ means a static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of alternating voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power.
(2)
‘Small power transformer’ means a power transformer with a highest voltage for equipment not exceeding 1,1 kV.
(3)
‘Medium power transformer’ means a power transformer with a highest voltage for equipment higher than 1,1 kV, but not exceeding 36 kV and a rated power equal to or higher than 5 kVA but lower than 40 MVA.
(4)
‘Large power transformer’ means a power transformer with a highest voltage for equipment exceeding 36 kV and a rated power equal or higher than 5 kVA, or a rated power equal to or higher than 40 MVA regardless of the highest voltage for equipment.
(5)
‘Liquid-immersed transformer’ means a power transformer in which the magnetic circuit and windings are immersed in liquid.
(6)
‘Dry-type transformer’ means a power transformer in which the magnetic circuit and windings are not immersed in an insulating liquid.
(7)
‘Medium power pole mounted transformer’ means a power transformer with a rated power of up to 315 kVA suitable for outdoor service and designed to be mounted on the support structures of overhead power lines.
(8)
‘Voltage Regulation Distribution Transformer’ means a medium power transformer equipped with additional components, inside or outside of the transformer tank, to automatically control the input or output voltage of the transformer for on-load voltage regulation purposes.
(9)
‘Winding’ refers to the assembly of turns forming an electrical circuit associated with one of the voltages assigned to the transformer.
(10)
‘Rated voltage of a winding’ (U
r
) is the voltage assigned to be applied, or developed at no-load, between the terminals of an untapped winding, or of a tapped winding connected on the principal tapping.
(11)
‘High-voltage winding’ refers to the winding having the highest rated voltage.
(12)
‘Highest voltage for equipment’ (U
m
) applicable to a transformer winding is the highest r.m.s phase-to-phase voltage in a three-phase system for which a transformer winding is designed in respect of its insulation.
(13)
‘Rated power’ (S
r
) is a conventional value of apparent power assigned to a winding which, together with the rated voltage of the winding, determines its rated current.
(14)
‘Load loss’ (P
k
) means the absorbed active power at rated frequency and reference temperature associated with a pair of windings when the rated current (tapping current) is flowing through the line terminal(s) of one of the windings and the terminals of the other windings are in short-circuit with any winding fitted with tappings connected to its principal tapping, while further windings, if existing, are open-circuited.
(15)
‘No load loss’ (P
o
) means the active power absorbed at rated frequency when the transformer is energised and the secondary circuit is open. The applied voltage is the rated voltage, and if the energized winding is fitted with a tapping, it is connected to its principal tapping.
(16)
‘Peak Efficiency Index’ (PEI) means the maximum value of the ratio of the transmitted apparent power of a transformer minus the electrical losses to the transmitted apparent power of the transformer.
Article 3
Eco-design requirements
Small power transformers, medium power transformers and large power transformer shall meet the ecodesign requirements set out in Annex I.
Article 4
Conformity Assessment
Conformity assessment shall be carried out applying the internal design control procedure set out in Annex IV to Directive 2009/125/EC or the management system procedure set out in Annex V to that Directive.
Article 5
Verification procedure for market surveillance purposes
When performing the market surveillance checks referred to in Directive 2009/125/EC, Article 3(2), Member State authorities shall apply the verification procedure set out in Annex III to this Regulation.
Article 6
Indicative Benchmarks
The indicative benchmarks for the best-performing transformers technologically possible at the time of adoption of this Regulation are identified in Annex IV.
Article 7
Review
No later than three years after the entry into force, the Commission shall review this Regulation in the light of technological progress and present the results of this review to the Consultation Forum. Specifically, the review will assess, at least, the following issues:
—
the possibility to set out minimum values of the Peak Efficiency Index for all medium power transformers, including those with a rated power below 3 150 kVA,
—
the possibility to separate the losses associated to the core transformer from those associated with other components performing voltage regulation functions, where this is the case,
—
the appropriateness of establishing minimum performance requirements for single-phase power transformers, as well as for small power transformers,
—
whether concessions made for pole-mounted transformers and for special combinations of winding voltages for medium power transformers are still appropriate,
—
the possibility of covering environmental impacts other than energy in the use phase.
Article 8
Entry into force
The Regulation shall enter into force on the 20
th
 day following its publication in the 
Official Journal of the European Union
.
This Regulation shall be binding in its entirety and directly applicable in all Member States.
Done at Brussels, 21 May 2014.
For the Commission
The President
José Manuel BARROSO
(
1
)
  
            
OJ L 285, 31.10.2009, p. 10
.
(
2
)
  Equipment intended for use in potentially explosive atmospheres is covered by Directive 94/9/EC of the European Parliament and of the Council (
OJ L 100, 19.4.1994, p. 1
).
ANNEX I
Ecodesign requirements
1.   
Minimum energy performance or efficiency requirements for medium power transformers
Medium power transformers shall comply with the maximum allowed load and no-load losses or the Peak Efficiency Index (PEI) values set out in Tables I.1 to I.5, excluding medium power pole-mounted transformers, which shall comply with the maximum allowed load and no load losses values set out in Table I.6.
1.1.   
Requirements for three-phase medium power transformers with rated power ≤ 3 150 kVA
Table I.1: Maximum load and no-load losses (in W) for three-phase 
liquid-immersed
 medium power transformers with one winding with U
m
 ≤ 24 kV and the other one with U
m
 ≤ 1,1 kV
Tier 1 (from 1 July 2015)
Tier 2 (from 1 July 2021)
Rated Power (kVA)
Maximum load losses P
k
 (W)
 (
*1
)
Maximum no-load losses P
o
 (W)
 (
*1
)
Maximum load losses P
k
 (W)
 (
*1
)
Maximum no-load losses P
o
 (W)
 (
*1
)
≤ 25
C
k
 (900)
A
o
 (70)
A
k
 (600)
A
o
 – 10 % (63)
50
C
k
 (1 100 )
A
o
 (90)
A
k
 (750)
A
o
 – 10 % (81)
100
C
k
 (1 750 )
A
o
 (145)
A
k
 (1 250 )
A
o
 – 10 % (130)
160
C
k
 (2 350 )
A
o
 (210)
A
k
 (1 750 )
A
o
 – 10 % (189)
250
C
k
 (3 250 )
A
o
 (300)
A
k
 (2 350 )
A
o
 – 10 % (270)
315
C
k
 (3 900 )
A
o
 (360)
A
k
 (2 800 )
A
o
 – 10 % (324)
400
C
k
 (4 600 )
A
o
 (430)
A
k
 (3 250 )
A
o
 – 10 % (387)
500
C
k
 (5 500 )
A
o
 (510)
A
k
 (3 900 )
A
o
 – 10 % (459)
630
C
k
 (6 500 )
A
o
 (600)
A
k
 (4 600 )
A
o
 – 10 % (540)
800
C
k
 (8 400 )
A
o
 (650)
A
k
 (6 000 )
A
o
 – 10 % (585)
1 000
C
k
 (10 500 )
A
o
 (770)
A
k
 (7 600 )
A
o
 – 10 % (693)
1 250
B
k
 (11 000 )
A
o
 (950)
A
k
 (9 500 )
A
o
 – 10 % (855)
1 600
B
k
 (14 000 )
A
o
 (1 200 )
A
k
 (12 000 )
A
o
 – 10 % (1080 )
2 000
B
k
 (18 000 )
A
o
 (1 450 )
A
k
 (15 000 )
A
o
 – 10 % (1 305 )
2 500
B
k
 (22 000 )
A
o
 (1 750 )
A
k
 (18 500 )
A
o
 – 10 % (1 575 )
3 150
B
k
 (27 500 )
A
o
 (2 200 )
A
k
 (23 000 )
A
o
 – 10 % (1 980 )
Table I.2: Maximum load and no-load losses (in W) for three –phase 
dry-type
 medium power transformers with one winding with U
m
 ≤ 24 kV and the other one with U
m
 ≤ 1,1 kV.
Tier 1 (1 July 2015)
Tier 2 (1 July 2021)
Rated Power (kVA)
Maximum load losses P
k
 (W)
 (
*2
)
Maximum no-load losses P
o
 (W)
 (
*2
)
Maximum load losses P
k
 (W)
 (
*2
)
Maximum no-load losses P
o
 (W)
 (
*2
)
≤ 50
B
k
 (1 700 )
A
o 
 (200)
A
k
 (1 500 )
A
o
 – 10 % (180)
100
B
k
 (2 050 )
A
o 
 (280)
A
k
 (1 800 )
A
o
 – 10 % (252)
160
B
k
 (2 900 )
A
o 
 (400)
A
k
 (2 600 )
A
o
 – 10 % (360)
250
B
k
 (3 800 )
A
o 
 (520)
A
k
 (3 400 )
A
o
 – 10 % (468)
400
B
k
 (5 500 )
A
o 
 (750)
A
k
 (4 500 )
A
o
 – 10 % (675)
630
B
k
 (7 600 )
A
o 
 (1 100 )
A
k
 (7 100 )
A
o
 – 10 % (990)
800
A
k
 (8 000 )
A
o 
 (1 300 )
A
k
 (8 000 )
A
o
 – 10 % (1 170 )
1 000
A
k
 (9 000 )
A
o 
 (1 550 )
A
k
 (9 000 )
A
o
 – 10 % (1 395 )
1 250
A
k
 (11 000 )
A
o 
 (1 800 )
A
k
 (11 000 )
A
o
 – 10 % (1 620 )
1 600
A
k
 (13 000 )
A
o 
 (2 200 )
A
k
 (13 000 )
A
o
 – 10 % (1 980 )
2 000
A
k
 (16 000 )
A
o 
 (2 600 )
A
k
 (16 000 )
A
o
 – 10 % (2 340 )
2 500
A
k
 (19 000 )
A
o 
 (3 100 )
A
k
 (19 000 )
A
o
 – 10 % (2 790 )
3 150
A
k
 (22 000 )
A
o 
 (3 800 )
A
k
 (22 000 )
A
o
 – 10 % (3 420 )
Table I.3: Correction of load and no load losses in case of other combinations of winding voltages or dual voltage in one or both windings (rated power ≤ 3 150  kVA)
One winding with U
m
 ≤ 24 kV and the other with U
m
 > 1,1 kV
The maximum allowable losses in Tables I.1 and I.2 shall be increased by 10 % for no load losses and by 10 % for load losses
One winding with U
m
 = 36 kV and the other with U
m
 ≤ 1,1 kV
The maximum allowable losses in Tables I.1 and I.2 shall be increased by 15 % for no load losses and by 10 % for load losses
One winding with U
m
 = 36 kV and the other with U
m
 > 1,1 kV
The maximum allowable losses indicated in Tables I.1 and I.2 shall be increased by 20 % for no load losses and by 15 % for load losses
Case of dual voltage on one winding
In case of transformers with one high-voltage winding and two voltages available from a tapped low-voltage winding, losses shall be calculated based on the higher voltage of the low-voltage winding and shall be in compliance with the maximum allowable losses in Tables I.1 and 1.2. The maximum available power on the lower voltage of the low-voltage winding on such transformers shall be limited to 0,85 of the rated power assigned to the low-voltage winding at its higher voltage.
In case of transformers with one low-voltage winding with two voltages available from a tapped high-voltage winding, losses shall be calculated based on the higher voltage of the high-voltage winding and shall be in compliance with the maximum allowable losses in Tables I.1 and I.2., The maximum available power on the lower voltage of the high-voltage winding on such transformer shall be limited to 0,85 of the rated power assigned to the high-voltage winding at its higher voltage.
If the full nominal power is available regardless of the combination of voltages, the levels of losses indicated in Tables I.1 and I.2 can be increased by 15 % for no load losses and by 10 % for load losses.
Case of dual voltage on both windings
The maximum allowable losses in Tables I.1 and I.2 can be increased by 20 % for no load losses and by 20 % for load losses for transformers with dual voltage on both windings. The level of losses is given for the highest possible rated power and on the basis that the rated power is the same regardless of the combination of voltages.
1.2.   
Requirements for medium power transformers with rated power > 3 150 kVA
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)
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)
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.
1.3.   
Requirements for medium power transformers with rated power ≤ 3 150 kVA equipped with tapping connections suitable for operation while being energised or on-load for voltage adaptation purposes. Voltage Regulation Distribution Transformers are included in this category.
The maximum allowable levels of losses set out in Tables I.1 and I.2 shall be increased by 20 % for no load losses and 5 % for load losses in Tier 1 and by 10 % for no load losses in Tier 2.
1.4.   
Requirements for medium power pole-mounted transformers
The levels of load and no load losses indicated in Tables I.1 and I.2 are not applicable to liquid immersed pole-mounted transformers with power ratings between 25 kVA and 315 kVA. For these specific models of medium power pole-mounted transformers, the maximum levels of allowable losses are set out in Table I.6.
Table I.6: Maximum load and no-load losses (in W) for medium power liquid immersed pole-mounted transformers
Tier 1 (1 July 2015)
Tier 2 (1 July 2021)
Rated Power (kVA)
Maximum load losses (in W)
 (
*3
)
Maximum no-load losses (in W)
 (
*3
)
Maximum load losses (in W)
 (
*3
)
Maximum no-load losses (in W)
 (
*3
)
25
C
k
 (900)
A
o
 (70)
B
k
 (725)
A
o
 (70)
50
C
k
 (1 100 )
A
o
 (90)
B
k
 (875)
A
o
 (90)
100
C
k
 (1 750 )
A
o
 (145)
B
k
 (1 475 )
A
o
 (145)
160
C
k
 + 32 % (3 102 )
C
o
 (300)
C
k
 + 32 % (3 102 )
C
o
 – 10 % (270)
200
C
k
 (2 750 )
C
o
 (356)
B
k
 (2 333 )
B
o
 (310)
250
C
k
 (3 250 )
C
o
 (425)
B
k
 (2 750 )
B
o
 (360)
315
C
k
 (3 900 )
C
o
 (520)
B
k
 (3 250 )
B
o
 (440)
2.   
Minimum energy efficiency requirements for large power transformers
The minimum efficiency requirements for large power transformers are set out in Tables I.7 and I.8.
Table I.7: Minimum Peak Efficiency Index requirements for liquid immersed large power transformers
Rated Power (MVA)
Tier 1 (1 July 2015)
Tier 2 (1 July 2021)
Minimum Peak Efficiency Index (%)
≤ 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
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
Rated Power (MVA)
Tier 1 (1 July 2015)
Tier 2 (1 July 2021)
Minimum Peak Efficiency Index (%)
≤ 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.8 shall be calculated by linear interpolation.
3.   
Product information requirements
From 1 July 2015, the following product information requirements for transformers included in the scope of this Regulation (Article 1) shall be included in any related product documentation, including free access websites of manufacturers:
(a)
information on rated power, load loss and no-load loss and the electrical power of any cooling system required at no load;
(b)
for medium power (where applicable) and large power transformers, the value of the Peak Efficiency Index and the power at which it occurs;
(c)
for dual voltage transformers, the maximum rated power at the lower voltage, according to Table I.3;
(d)
information on the weight of all the main components of a power transformer (including at least the conductor, the nature of the conductor and the core material);
(e)
For medium power pole mounted transformers, a visible display ‘For pole-mounted operation only’.
The information under a); c) and d) shall also be included on the rating plate of the power transformers.
4.   
Technical documentation
The following information shall be included in the technical documentation of power transformers:
(a)
manufacturer's name and address;
(b)
model identifier, the alphanumeric code to distinguish one model from other models of the same manufacturer;
(c)
the information required under point 3.
If (parts of) the technical documentation is based upon (parts of) the technical documentation of another model, the model identifier of that model shall be provided and the technical documentation shall provide the details of how the information is derived from the technical documentation of the other model, e.g. on calculations or extrapolations, including the tests undertaken by the manufacturer to verify the calculations or extrapolations undertaken.
(
*1
)
  Maximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation.
(
*2
)
  Maximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation.
(
*3
)
  Maximum allowable losses for kVA ratings that fall in between the ratings given in Table I.6 shall be obtained by linear interpolation.
ANNEX II
Measurement and calculation methods
Measurement method
For the purpose of compliance with the requirements of this Regulation, measurements shall be made using a reliable, accurate and reproducible measurement procedure, which takes into account the generally recognised state of the art measurement methods, including methods set out in documents the reference numbers of which have been published for that purpose in the 
Official Journal of the European Union
.
Calculation methods
The methodology for calculating the Peak Efficiency Index (PEI) for medium and large power transformers is based on the ratio of the transmitted apparent power of a transformer minus the electrical losses to the transmitted apparent power of the transformer.
Where:
P
0
 is the no load losses measure at rated voltage and rated frequency, on the rated tap
P
c0
 is the electrical power required by the cooling system for no load operation
P
k
 is the measured load loss at rated current and rated frequency on the rated tap corrected to the reference temperature
S
r
 is the rated power of the transformer or autotransformer on which P
k
 is based
ANNEX III
Verification procedure
When performing the market surveillance checks referred to in Article 3(2) of Directive 2009/125/EC, the authorities of the Member States shall apply the following verification procedure for the requirements set out in Annex I.
(1)
Member States authorities shall test one single unit per model;
(2)
The model shall be considered to comply with the applicable requirements set out in Annex I of this Regulation if the values in the technical documentation comply with the requirements set out in Annex I, and if the measured parameters meet the requirements set out in Annex I within the verification tolerances indicated in the Table of this Annex;
(3)
If the results referred to in point 2 are not achieved, the model shall be considered not to comply with this Regulation. The Member States authorities shall provide all relevant information, including the test results if applicable, to the authorities of the other Member States and the Commission within one month of the decision being taken on the non-compliance of the model.
Member States authorities shall use the measurement methods and calculation methods set out in Annex II.
Given the weight and size limitations in the transportation of medium and large power transformers, Member States authorities may decide to undertake the verification procedure at the premises of manufacturers, before they are put into service in their final destination.
The verification tolerances set out in this Annex relate only to the verification of the measured parameters by Member States authorities and shall not be used by the manufacturer or importer as an allowed tolerance to establish the values in the technical documentation.
Table
Measured parameter
Verification tolerances
Load losses
The measured value shall not be greater than the declared value by more than 5 %.
No load losses
The measured value shall not be greater than the declared value by more than 5 %.
The electrical power required by the cooling system for no load operation
The measured value shall not be greater than the declared value by more than 5 %.
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:
(a)
Liquid-immersed medium power transformers: A
o
 – 20 %, A
k
 – 20 %
(b)
Dry-type medium power transformers: A
o
 – 20 %, A
k
 – 20 %
(c)
Medium power transformers with amorphous steel core: A
o
 – 50 %, A
k
 – 50 %
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.

Summary:
Ecodesign requirements — power transformers
SUMMARY OF:
Regulation (EU) 
No 548/2014
 with regard to small, medium and large power transformers
WHAT IS THE AIM OF THE REGULATION?
Regulation (EU) 
No 548/2014
, implementing Directive 
2009/125/EC
, sets out 
ecodesign
1
 requirements for placing on the market or putting into service 
power transformers
 with a minimum power rating of 1 kVA used in 50 Hz electricity transmission and distribution networks or for industrial applications.
Experience in the implementation of Directive 2009/125/EC revealed that there were national deviations in standard voltages in electricity distribution grids in certain EU countries. These deviations justified changing the threshold voltage levels in the categorisation of transformers and the applicable minimum energy performance requirements. Regulation (EU) 
2019/1783
 therefore amends Regulation (EU) 
No 548/2014.
KEY POINTS
The regulation applies to transformers purchased after 
11 June 2014
.
Medium
2
 and 
large transformers
3
, regardless of when put on the market or into service, must be 
reassessed
 for compliance and conformity with the regulation if: 
the core or part of the core has been replaced; and
one or more of the complete windings has been replaced.
Transformers designed for a number of specific purposes are 
excluded
 from the regulation including those to be: 
directly connected to a furnace;
installed on fixed or floating offshore platforms, offshore wind turbines or on board ships and all kinds of vessels;
used in arc-welding equipment or resistance-welding equipment.
The ecodesign requirements are set out in the annexes to the regulation.
The regulation sets out the conformity assessment procedure.
Changes introduced under Regulation (EU) 2019/1783
These changes include:
if threshold voltages in electricity distribution networks deviate from the standard ones across the EU, EU countries must notify the 
European Commission
 accordingly, so that a 
public notification
 can be made for the correct interpretation of the various tables in Annex I to the regulation (ecodesign requirements);
the manufacturer, importer or authorised representative must not put on the market any products that can detect when they are being tested and change their performance accordingly;
to make verification testing easier, market surveillance authorities are permitted to test, or witness the testing of, larger transformers at premises such as those of the manufacturer;
the Commission will 
review
 the regulation and present the results no later than 
1 July 2023
.
FROM WHEN DOES THE REGULATION APPLY?
Regulation (EU) 
No 548/2014
 has applied since 
11 June 2014
. The changes introduced by amending Regulation (EU) 2019/1783 have applied since 
14 November 2019
.
BACKGROUND
Directive 2009/125/EC establishes a framework to set 
ecodesign requirements for energy-related products
. The Commission must set these for products which are widely sold and traded in the EU and have a significant environmental impact.
For more information see:
Power transformers: Ecodesign requirements
 (
European Commission
)
The new ecodesign measures explained
 (
European Commission
)
About the energy label and ecodesign — Energy savings
 (
European Commission
).
KEY TERMS
Ecodesign:
 Policy to improve, through better design, products’ environmental performance throughout their life cycle, especially their energy efficiency.
Medium power transformers:
 a power transformer with all windings having rated power lower than or equal to 3 150 kVA, and highest voltage for equipment greater than 1.1 kV and lower than or equal to 36 kV.
Large power transformers:
 a power transformer with at least one winding having either rated power greater than 3 150 kVA or highest voltage for equipment greater than 36 kV.
MAIN DOCUMENT
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 (OJ L 152, 
22.5.2014
, 
pp. 1-15
)
Successive amendments to Regulation (EU) 
No 548/2014
 have been incorporated into the original text. This 
consolidated version
 is of documentary value only.
RELATED DOCUMENTS
Commission 
communication
 in the framework of the implementation of Commission 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 (Publication of titles and references of harmonised standards under Union harmonisation legislation) (OJ C 416, 
11.11.2016
, 
pp. 12-13
)
Directive 
2009/125/EC
 of the European Parliament and of the Council of 
21 October 2009
 establishing a framework for the setting of ecodesign requirements for energy-related products (OJ L 285, 
31.10.2009
, 
pp. 10-35
)
See 
consolidated version
.
last update 
30.1.2020

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