{
  "url": "https://openlegislation.uk/eu-regulation-2014-548/annex-I/division-1/division-1.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2014-548/annex-I/division-1/division-1.1.json",
  "legislation": "eur/2014/548",
  "legislation_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",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2014-548",
  "path": "annex/I/division/1/division/1.1",
  "kind": "division",
  "number": "1.1",
  "heading": "Requirements for three-phase medium power transformers with rated power ≤ 3 150 kVA",
  "text": "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 ≤ 24kV and the other with U m ≤ 3,6 kV\nMaximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation.\nTier 1 (from 1 July 2015)\nTier 2 (from 1 July 2021)\nRated Power (kVA)\nMaximum load losses Pk (W)\nMaximum no-load losses Po (W)\nMaximum load losses Pk (W)\nMaximum no-load losses Po (W)\n≤ 25\nCk (900)\nAo (70)\nAk (600)\nAo – 10 % (63)\n50\nCk (1 100)\nAo (90)\nAk (750)\nAo – 10 % (81)\n100\nCk (1 750)\nAo (145)\nAk (1 250)\nAo – 10 % (130)\n160\nCk (2 350)\nAo (210)\nAk (1 750)\nAo – 10 % (189)\n250\nCk (3 250)\nAo (300)\nAk (2 350)\nAo – 10 % (270)\n315\nCk (3 900)\nAo (360)\nAk (2 800)\nAo – 10 % (324)\n400\nCk (4 600)\nAo (430)\nAk (3 250)\nAo – 10 % (387)\n500\nCk (5 500)\nAo (510)\nAk (3 900)\nAo – 10 % (459)\n630\nCk (6 500)\nAo (600)\nAk (4 600)\nAo – 10 % (540)\n800\nCk (8 400)\nAo (650)\nAk (6 000)\nAo – 10 % (585)\n1 000\nCk (10 500)\nAo (770)\nAk (7 600)\nAo – 10 % (693)\n1 250\nBk (11 000)\nAo (950)\nAk (9 500)\nAo – 10 % (855)\n1 600\nBk (14 000)\nAo (1 200)\nAk (12 000)\nAo – 10 % (1 080)\n2 000\nBk (18 000)\nAo (1 450)\nAk (15 000)\nAo – 10 % (1 305)\n2 500\nBk (22 000)\nAo (1 750)\nAk (18 500)\nAo – 10 % (1 575)\n3 150\nBk (27 500)\nAo (2 200)\nAk (23 000)\nAo – 10 % (1 980)\nTable I.2: Maximum load and no-load losses (in W) for three-phase dry-type medium power transformers with one winding with Um ≤ 24kV and the other with Um ≤ 3,6 kV\nMaximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation.\nTier 1 (1 July 2015)\nTier 2 (1 July 2021)\nRated Power (kVA)\nMaximum load losses Pk (W)\nMaximum no-load losses Po (W)\nMaximum load losses Pk (W)\nMaximum no-load losses Po (W)\n≤ 50\nBk (1 700)\nAo (200)\nAk (1 500)\nAo – 10 % (180)\n100\nBk (2 050)\nAo (280)\nAk (1 800)\nAo – 10 % (252)\n160\nBk (2 900)\nAo (400)\nAk (2 600)\nAo – 10 % (360)\n250\nBk (3 800)\nAo (520)\nAk (3 400)\nAo – 10 % (468)\n400\nBk (5 500)\nAo (750)\nAk (4 500)\nAo – 10 % (675)\n630\nBk (7 600)\nAo (1 100)\nAk (7 100)\nAo – 10 % (990)\n800\nAk (8 000)\nAo (1 300)\nAk (8 000)\nAo – 10 % (1 170)\n1 000\nAk (9 000)\nAo (1 550)\nAk (9 000)\nAo – 10 % (1 395)\n1 250\nAk (11 000)\nAo (1 800)\nAk (11 000)\nAo – 10 % (1 620)\n1 600\nAk (13 000)\nAo (2 200)\nAk (13 000)\nAo – 10 % (1 980)\n2 000\nAk (16 000)\nAo (2 600)\nAk (16 000)\nAo – 10 % (2 340)\n2 500\nAk (19 000)\nAo (3 100)\nAk (19 000)\nAo – 10 % (2 790)\n3 150\nAk (22 000)\nAo (3 800)\nAk (22 000)\nAo – 10 % (3 420)\nTable I.3a\nCorrection factors to be applied to the load and no load losses indicated in Tables I.1, I.2 and I.6 for medium power transformers with special combinations of winding voltages (for rated power ≤ 3 150 kVA)\nSpecial combination of voltages in one winding\nLoad losses (P k )\nNo load losses (P o )\nFor both liquid immersed (Table I.1) and dry type (Table I.2)\nNo correction\nNo correction\nPrimary highest voltage for equipment U m ≤ 24kV\nSecondary highest voltage for equipment U m > 3,6 kV\nFor liquid immersed (Table I.1)\n10 %\n15 %\nPrimary highest voltage for equipment Um = 36kV\nSecondary highest voltage for equipment Um ≤ 3,6 kV\nPrimary highest voltage for equipment Um = 36kV\nSecondary highest voltage for equipment Um > 3,6 kV\n10 %\n15 %\nFor dry type (Table I.2)\n10 %\n15 %\nPrimary highest voltage for equipment Um = 36kV\nSecondary highest voltage for equipment Um ≤ 3,6 kV\nPrimary highest voltage for equipment Um = 36kV\nSecondary highest voltage for equipment Um > 3,6 kV\n15 %\n20 %\nTable I.3b\nCorrection factors to be applied to the load and no load losses indicated in Tables I.1, I.2 and I.6 for medium power transformers with dual voltage in one or both windings differing more than 10 % and rated power ≤ 3 150 kVA.\nThe losses shall be calculated on the base of the voltage of the winding specified in the second column and can be increased with the correction factors given in the last 2 columns. In any case, whatever the combinations of winding voltages, the losses cannot exceed the values given in Tables I.1, I.2 and I.6 corrected by the factors in this table.\nType of dual voltage\nReference voltage for the application of correction factors\nLoad losses (Pk)\nNo load losses (Po)\nDual voltage on one winding with reduced power output on the lower low-voltage winding\nAND\nmaximum available power on the lower voltage of the low-voltage winding limited to 0,85 of the rated power assigned to the low-voltage winding at its higher voltage.\nlosses shall be calculated based on the higher voltage of the low-voltage winding\nNo correction\nNo correction\nDual voltage on one winding with reduced power output on the lower high-voltage winding\nAND\nmaximum available power on the lower voltage of the high-voltage winding limited to 0,85 of the rated power assigned to the high-voltage winding at its higher voltage.\nlosses shall be calculated based on the higher voltage of the high-voltage winding\nNo correction\nNo correction\nDual voltage on one winding\nAND\nfull rated power available on both windings, i.e., the full nominal power is available regardless of the combination of voltages.\nThe losses shall be calculated based on the higher voltage of the dual voltage winding\n10 %\n15 %\nDual voltage on both windings\nAND\nrated power available on all combinations of windings, i.e., both voltages on one winding are fully rated in combination with one of the voltages on the other winding\nthe losses shall be calculated based on the higher voltages of both dual voltage windings\n20 %\n20 %",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted 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)."
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "Maximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "Maximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "The losses shall be calculated on the base of the voltage of the winding specified in the second column and can be increased with the correction factors given in the last 2 columns. In any case, whatever the combinations of winding voltages, the losses cannot exceed the values given in Tables I.1, I.2 and I.6 corrected by the factors in this table."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2014/548/annex/I/division/1/division/1.1",
    "retrieved_at": "2026-11-01T14:47:38.642843+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}