Standard transformer losses:
| Rated Power | Voltage | Current (Io) | Load Losses | No Load Losses | Impedance | Cos@=0.8 | Cos@=1.0 | ||
|---|---|---|---|---|---|---|---|---|---|
| Voltage Drop @Full Load | Efficiency @Full Load | Voltage Drop @Full Load | Efficiency @Full Load | ||||||
| kVA | kV | % | W | W | %Uk | % | % | % | % |
| 25 | 6,3-11 | 2,50 | 700 | 115 | 4,00 | 3,96 | 96,08 | 2841 | 96,84 |
| 15 | 2,50 | 700 | 115 | 4,00 | 3,96 | 96,08 | 2841 | 96,84 | |
| 33 | 3,15 | 800 | 160 | 4,50 | 4,46 | 95,41 | 3250 | 96,30 | |
| 40 | 6,3-11 | 2,40 | 940 | 160 | 4,00 | 3,83 | 96,67 | 2402 | 97,32 |
| 15 | 2,40 | 940 | 160 | 4,00 | 3,83 | 96,67 | 2402 | 97,32 | |
| 33 | 2,92 | 1070 | 200 | 4,50 | 4,32 | 96,18 | 2740 | 96,92 | |
| 50 | 6,3-11 | 2,30 | 1100 | 190 | 4,00 | 3,77 | 96,87 | 2256 | 97,48 |
| 15 | 2,30 | 1110 | 190 | 4,00 | 3,77 | 96,87 | 2256 | 97,48 | |
| 33 | 2,76 | 1250 | 230 | 4,50 | 4,26 | 96,43 | 2570 | 97,12 | |
| 63 | 6,3-11 | 2,25 | 1270 | 225 | 4,00 | 3,70 | 97,11 | 2076 | 97,68 |
| 15 | 2,25 | 1270 | 225 | 4,00 | 3,70 | 97,11 | 2076 | 97,68 | |
| 33 | 2,62 | 1430 | 270 | 4,50 | 4,16 | 96,73 | 2345 | 97,37 | |
| 80 | 6,3-11 | 2,20 | 1490 | 270 | 4,00 | 3,63 | 97,32 | 1925 | 97,84 |
| 15 | 2,20 | 1490 | 270 | 4,00 | 3,63 | 97,32 | 1925 | 97,84 | |
| 33 | 2,50 | 1670 | 320 | 4,50 | 4,08 | 96,98 | 2167 | 97,57 | |
| 100 | 6,3-11 | 2,10 | 1750 | 320 | 4,00 | 3,58 | 97,47 | 1815 | 97,97 |
| 15 | 2,10 | 1750 | 320 | 4,00 | 3,58 | 97,47 | 1815 | 97,97 | |
| 33 | 2,27 | 1950 | 380 | 4,50 | 4,02 | 97,16 | 2035 | 97,72 | |
| 125 | 6,3-11 | 2,00 | 2000 | 380 | 4,00 | 3,50 | 97,67 | 1667 | 98,13 |
| 15 | 2,00 | 2000 | 380 | 4,00 | 3,50 | 97,67 | 1667 | 98,13 | |
| 33 | 2,14 | 2200 | 440 | 4,50 | 3,92 | 97,42 | 1846 | 97,93 | |
| 160 | 6,3-11 | 1,90 | 2350 | 460 | 4,00 | 3,43 | 97,85 | 1538 | 98,27 |
| 15 | 1,90 | 2350 | 460 | 4,00 | 3,43 | 97,85 | 1538 | 98,27 | |
| 33 | 2,00 | 2550 | 520 | 4,50 | 3,83 | 97,65 | 1682 | 98,11 | |
| 200 | 6,3-11 | 1,90 | 2750 | 545 | 4,00 | 3,38 | 97,98 | 1446 | 98,37 |
| 15 | 1,90 | 2750 | 545 | 4,00 | 3378,00 | 97,98 | 1446 | 98,37 | |
| 33 | 1,90 | 2950 | 635 | 4,50 | 3,77 | 97,79 | 1575 | 98,22 | |
| 250 | 6,3-11 | 1,60 | 3250 | 650 | 4,00 | 3,34 | 98,08 | 1372 | 98,46 |
| 15 | 1,60 | 3250 | 650 | 4,00 | 3,34 | 98,08 | 1372 | 98,46 | |
| 33 | 1,80 | 3500 | 780 | 4,50 | 3,72 | 97,90 | 1491 | 98,31 | |
| 315 | 6,3-11 | 1,50 | 3835 | 770 | 4,00 | 3,29 | 98,20 | 1290 | 98,55 |
| 15 | 1,50 | 3835 | 770 | 4,00 | 3,29 | 98,20 | 1290 | 98,55 | |
| 33 | 1,70 | 4110 | 930 | 4,50 | 3,66 | 98,03 | 1397 | 98,42 | |
| 400 | 6,3-11 | 1,50 | 4600 | 930 | 4,00 | 3,25 | 98,30 | 1223 | 98,63 |
| 15 | 1,50 | 4600 | 930 | 4,00 | 3,25 | 98,30 | 1223 | 98,63 | |
| 33 | 1,70 | 4900 | 1120 | 4,50 | 3,62 | 98,15 | 1319 | 98,51 | |
| 500 | 6,3-11 | 1,40 | 5425 | 1090 | 4,00 | 3,21 | 98,39 | 1159 | 98,71 |
| 15 | 1,40 | 5425 | 1090 | 4,00 | 3,21 | 98,39 | 1159 | 98,71 | |
| 33 | 1,60 | 5700 | 1300 | 4,50 | 3,56 | 98,29 | 1227 | 98,63 | |
| 630 | 6,3-11 | 1,40 | 6500 | 1300 | 4,00 | 3,18 | 98,47 | 1106 | 98,77 |
| 15 | 1,40 | 6500 | 1300 | 4,00 | 3,18 | 98,47 | 1106 | 98,77 | |
| 33 | 1,60 | 6650 | 1450 | 4,50 | 3,51 | 98,41 | 1151 | 98,73 | |
| 800 | 6,3-11 | 1,30 | 8500 | 1500 | 6,00 | 4,13 | 98,50 | 1173 | 98,80 |
| 15 | 1,30 | 8500 | 1500 | 6,00 | 4,13 | 98,50 | 1173 | 98,80 | |
| 33 | 1,50 | 8700 | 1750 | 6,00 | 4,15 | 98,44 | 1196 | 98,75 | |
| 1000 | 6,3-11 | 1,20 | 10500 | 1700 | 6,00 | 4,47 | 98,49 | 1224 | 98,79 |
| 15 | 1,20 | 10500 | 1700 | 6,00 | 4,47 | 98,49 | 1224 | 98,79 | |
| 33 | 1,40 | 10500 | 2000 | 6,00 | 4,47 | 98,46 | 1224 | 98,76 | |
| 1250 | 6,3-11 | 1,20 | 13000 | 2100 | 6,00 | 4,46 | 98,51 | 1215 | 98,80 |
| 15 | 1,20 | 13000 | 2100 | 6,00 | 4,46 | 98,51 | 1215 | 98,80 | |
| 33 | 1,40 | 13000 | 2250 | 6,00 | 4,46 | 98,49 | 1215 | 98,79 | |
| 1600 | 6,3-11 | 1,10 | 17000 | 2600 | 6,00 | 4,48 | 98,49 | 1237 | 98,78 |
| 15 | 1,10 | 17000 | 2600 | 6,00 | 4,48 | 98,49 | 1237 | 98,78 | |
| 33 | 1,30 | 17000 | 2800 | 6,00 | 4,48 | 98,47 | 1237 | 98,77 | |
| 2000 | 6,3-11 | 1,10 | 21000 | 3200 | 6,00 | 4,47 | 98,51 | 1224 | 98,80 |
| 15 | 1,10 | 21000 | 3200 | 6,00 | 4,47 | 98,51 | 1224 | 98,80 | |
| 33 | 1,20 | 21000 | 3200 | 6,00 | 4,47 | 98,51 | 1224 | 98,80 | |
| 2500 | 6,3-11 | 1,00 | 24000 | 3800 | 6,00 | 4,41 | 98,62 | 1135 | 98,90 |
| 15 | 1,00 | 24000 | 3800 | 6,00 | 4,41 | 98,62 | 1135 | 98,90 | |
| 33 | 1,10 | 24000 | 3800 | 6,00 | 4,41 | 98,62 | 1135 | 98,90 | |
Eco Design Um=< 24 kV
Transformer losses as per (EU) No 548/2014 directive
| Rated Power [kVA] | Tier 1 (from 1 July 2015) (LL-NLL) [Watt] | Tier 2 (from 1 July 2021) (LL-NLL) [Watt] | ||
|---|---|---|---|---|
| Maximum load losses Pk (W) | Maximum no-load losses Po (W) | Maximum load losses Pk (W) | Maximum no-load losses Po (W) | |
| ≤ 25 | Ck (900) | A0 (70) | Ak (600) | A0 -10% (63) |
| 50 | Ck (1100) | A0 (90) | Ak (750) | A0 -10% (81) |
| 100 | Ck (1750) | A0 (145) | Ak (1250) | A0 -10% (130) |
| 160 | Ck (2350) | A0 (210) | Ak (1750) | A0 -10% (189) |
| 250 | Ck (3250) | A0 (300) | Ak (2350) | A0 -10% (270) |
| 315 | Ck (3900) | A0 (360) | Ak (2800) | A0 -10% (324) |
| 400 | Ck (4600) | A0 (430) | Ak (3250) | A0 -10% (387) |
| 500 | Ck (5500) | A0 (510) | Ak (3900) | A0 -10% (459) |
| 630 | Ck (6500) | A0 (600) | Ak (4600) | A0 -10% (540) |
| 800 | Ck (8400) | A0 (650) | Ak (6000) | A0 -10% (585) |
| 1000 | Ck (10500) | A0 (770) | Ak (7600) | A0 -10% (693) |
| 1250 | Bk (11000) | A0 (950) | Ak (9500) | A0 -10% (855) |
| 1600 | Bk (14000) | A0 (1200) | Ak (12000) | A0 -10% (1080) |
| 2000 | Bk (18000) | A0 (1450) | Ak (15000) | A0 -10% (1305) |
| 2500 | Bk (22000) | A0 (1750) | Ak (18500) | A0 -10% (1575) |
| 3150 | Bk (27500) | A0 (2200) | Ak (23000) | A0 -10% (1980) |
Eco Design Um=< 36 kV
Transformer losses as per (EU) No 548/2014 directive
| Rated Power [kVA] | Tier 1 (from 1 July 2015) (LL-NLL) [Watt] | Tier 2 (from 1 July 2021) (LL-NLL) [Watt] | ||
|---|---|---|---|---|
| Maximum load losses Pk (W) | Maximum no-load losses Po (W) | Maximum load losses Pk (W) | Maximum no-load losses Po (W) | |
| ≤ 25 | Ck (990) | A0 (80) | Ck (660) | A0 (72) |
| 50 | Ck (1210) | A0 (103) | Ck (825) | A0 (93) |
| 100 | Ck (1925) | A0 (166) | Ck (1375) | A0 (149) |
| 160 | Ck (2585) | A0 (241) | Ck (1925) | A0 (217) |
| 250 | Ck (3575) | A0 (345) | Ck (2585) | A0 (310) |
| 315 | Ck (4290) | A0 (414) | Ck (3080) | A0 (372) |
| 400 | Ck (5060) | A0 (494) | Ck (3575) | A0 (445) |
| 500 | Ck (6050) | A0 (586) | Ck (4290) | A0 (527) |
| 630 | Ck (7150) | A0 (690) | Ck (5060) | A0 (621) |
| 800 | Ck (9240) | A0 (747) | Ck (6600) | A0 (672) |
| 1000 | Ck (11550) | A0 (885) | Ck (8360) | A0 (796) |
| 1250 | Ck (12100) | A0 (1092) | Ck (10450) | A0 (983) |
| 1600 | Ck (15400) | A0 (1380) | Ck (13200) | A0 (1242) |
| 2000 | Ck (19800) | A0 (1667) | Ck (16500) | A0 (1500) |
| 2500 | Ck (24200) | A0 (2012) | Ck (20350) | A0 (1811) |
| 3150 | Ck (30250) | A0 (2530) | Ck (25300) | A0 (2277) |