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Commission Regulation (EU) No 548/2014Show full title
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
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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 Um ≤ 24 kV and the other one with Um ≤ 1,1 kV
| a Maximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation. | ||||
| Tier 1 (from 1 July 2015) | Tier 2 (from 1 July 2021) | |||
|---|---|---|---|---|
| Rated Power (kVA) | Maximum load losses Pk (W)a | Maximum no-load losses Po (W)a | Maximum load losses Pk (W)a | Maximum no-load losses Po (W)a |
| ≤ 25 | Ck (900) | Ao (70) | Ak (600) | Ao – 10 % (63) |
| 50 | Ck (1 100) | Ao (90) | Ak (750) | Ao – 10 % (81) |
| 100 | Ck (1 750) | Ao (145) | Ak (1 250) | Ao – 10 % (130) |
| 160 | Ck (2 350) | Ao (210) | Ak (1 750) | Ao – 10 % (189) |
| 250 | Ck (3 250) | Ao (300) | Ak (2 350) | Ao – 10 % (270) |
| 315 | Ck (3 900) | Ao (360) | Ak (2 800) | Ao – 10 % (324) |
| 400 | Ck (4 600) | Ao (430) | Ak (3 250) | Ao – 10 % (387) |
| 500 | Ck (5 500) | Ao (510) | Ak (3 900) | Ao – 10 % (459) |
| 630 | Ck (6 500) | Ao (600) | Ak (4 600) | Ao – 10 % (540) |
| 800 | Ck (8 400) | Ao (650) | Ak (6 000) | Ao – 10 % (585) |
| 1 000 | Ck (10 500) | Ao (770) | Ak (7 600) | Ao – 10 % (693) |
| 1 250 | Bk (11 000) | Ao (950) | Ak (9 500) | Ao – 10 % (855) |
| 1 600 | Bk (14 000) | Ao (1 200) | Ak (12 000) | Ao – 10 % (180) |
| 2 000 | Bk (18 000) | Ao (1 450) | Ak (15 000) | Ao – 10 % (1 305) |
| 2 500 | Bk (22 000) | Ao (1 750) | Ak (18 500) | Ao – 10 % (1 575) |
| 3 150 | Bk (27 500) | Ao (2 200) | Ak (23 000) | Ao – 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 Um ≤ 24 kV and the other one with Um ≤ 1,1 kV.
| a Maximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation. | ||||
| Tier 1 (1 July 2015) | Tier 2 (1 July 2021) | |||
|---|---|---|---|---|
| Rated Power (kVA) | Maximum load losses Pk (W)a | Maximum no-load losses Po (W)a | Maximum load losses Pk (W)a | Maximum no-load losses Po (W)a |
| ≤ 50 | Bk (1 700) | Ao (200) | Ak (1 500) | Ao – 10 % (180) |
| 100 | Bk (2 050) | Ao (280) | Ak (1 800) | Ao – 10 % (252) |
| 160 | Bk (2 900) | Ao (400) | Ak (2 600) | Ao – 10 % (360) |
| 250 | Bk (3 800) | Ao (520) | Ak (3 400) | Ao – 10 % (468) |
| 400 | Bk (5 500) | Ao (750) | Ak (4 500) | Ao – 10 % (675) |
| 630 | Bk (7 600) | Ao (1 100) | Ak (7 100) | Ao – 10 % (990) |
| 800 | Ak (8 000) | Ao (1 300) | Ak (8 000) | Ao – 10 % (1 170) |
| 1 000 | Ak (9 000) | Ao (1 550) | Ak (9 000) | Ao – 10 % (1 395) |
| 1 250 | Ak (11 000) | Ao (1 800) | Ak (11 000) | Ao – 10 % (1 620) |
| 1 600 | Ak (13 000) | Ao (2 200) | Ak (13 000) | Ao – 10 % (1 980) |
| 2 000 | Ak (16 000) | Ao (2 600) | Ak (16 000) | Ao – 10 % (2 340) |
| 2 500 | Ak (19 000) | Ao (3 100) | Ak (19 000) | Ao – 10 % (2 790) |
| 3 150 | Ak (22 000) | Ao (3 800) | Ak (22 000) | Ao – 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 Um ≤ 24 kV and the other with Um > 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 Um = 36 kV and the other with Um ≤ 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 Um = 36 kV and the other with Um > 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 < Sr ≤ 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 < Sr ≤ 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
| a Maximum allowable losses for kVA ratings that fall in between the ratings given in Table I.6 shall be obtained by linear interpolation. | ||||
| Tier 1 (1 July 2015) | Tier 2 (1 July 2021) | |||
|---|---|---|---|---|
| Rated Power (kVA) | Maximum load losses (in W)a | Maximum no-load losses (in W)a | Maximum load losses (in W)a | Maximum no-load losses (in W)a |
| 25 | Ck (900) | Ao (70) | Bk (725) | Ao (70) |
| 50 | Ck (1 100) | Ao (90) | Bk (875) | Ao (90) |
| 100 | Ck (1 750) | Ao (145) | Bk (1 475) | Ao (145) |
| 160 | Ck + 32 % (3 102) | Co (300) | Ck + 32 % (3 102) | Co – 10 % (270) |
| 200 | Ck (2 750) | Co (356) | Bk (2 333) | Bo (310) |
| 250 | Ck (3 250) | Co (425) | Bk (2 750) | Bo (360) |
| 315 | Ck (3 900) | Co (520) | Bk (3 250) | Bo (440) |
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