{
  "url": "https://openlegislation.uk/eu-regulation-2019-1783/annex/division-1",
  "json_url": "https://openlegislation.uk/eu-regulation-2019-1783/annex/division-1.json",
  "legislation": "eur/2019/1783",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2019-1783",
  "path": "annex/division/1",
  "kind": "division",
  "number": "(1)",
  "heading": "Annex I is amended as follows:",
  "text": "(a) point 1 is amended as follows:\n(i) the title of Table I.1 is replaced as follows:\n‘Maximum load and no-load losses (in W) for three-phase liquid-immersed medium power transformers with one winding with Um ≤ 24kV and the other with Um ≤ 3,6 kV’;\n(ii) the title of Table I.2 is replaced as follows:\n‘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’;\n(iii) the following paragraphs are added after the first paragraph:\n‘As of the date of application of Tier 2 requirements (1 July 2021), when the one-to-one replacement of an existing medium power transformer entails disproportionate costs associated with their installation, the replacement transformer is, exceptionally, only required to meet Tier 1 requirements for the given rated power.\nIn this respect, installation costs are disproportionate if the costs of the replacement of the complete substation housing the transformer and/or the acquisition or rental of additional floor space are higher than the net present value of the additional avoided electricity losses (tariffs, taxes and levies excluded) of a Tier 2 compliant replacement transformer over its normally expected service life. The net present value shall be calculated based on capitalised loss values using widely accepted social discount rates.\nIn this case, the manufacturer, importer, or authorised representative shall include in the technical documentation of the replacement transformer the following information:\nAddress and contact details of the commissioner of the replacement transformer\nThe station where the replacement transformer is to be installed. This shall be unequivocally identified by either a specific location or a specific installation type (e.g., station or cabin model)\nThe technical and/or economic justification of the disproportionate cost to install a transformer that is only Tier 1 compliant instead of a Tier 2 compliant one. If the transformers(s) were commissioned by a tendering process, all the necessary information regarding the analysis of bids and the award decision shall be provided.\nIn the above cases, the manufacturer, importer or authorised representative shall notify the competent national market surveillance authorities.’;\n(iv) Table I.3 is replaced by Tables I.3a and I.3b as follows:\n‘\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 (Pk)\nNo load losses (Po)\nFor both liquid immersed (Table I.1) and dry type (Table I.2)\nNo correction\nNo correction\nPrimary highest voltage for equipment Um ≤ 24kV\nSecondary highest voltage for equipment Um > 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 %\n’;\n(b) in point 1.4, the first paragraph is replaced as follows:\n‘1.4.\nFor the one-to-one replacement of existing medium power pole-mounted transformers with power ratings between 25 kVA and 400 kVA, the applicable maximum levels of load and no-load losses are not the ones in Tables I.1 and I.2, but those in Table I.6 below. Maximum allowable losses for kVA ratings other than those explicitly mentioned in Table I.6 shall be obtained by linear interpolation or extrapolation. The correction factors for special combinations of winding voltages indicated in Tables I.3a and I.3b are also applicable.\nFor the one-to-one replacement of existing medium power pole-mounted transformers, the manufacturer, importer or authorised representative shall include in the technical documentation of the transformer the following information:\nthe address and contact details of the commissioner of the replacement transformer;\nthe station where the replacement transformer is to be installed. This shall be unequivocally identified either by a specific location or an specific installation type (e.g. technical description of the pole).\nIn the above cases, the manufacturer, importer or authorised representative shall notify the competent national market surveillance authorities.\nWith regard to the installation of new pole-mounted transformers, it is the requirements in Tables I.1 and I.2, in conjunction with Tables I.3a and I.3b where justified, which are applicable.’;\n(c) point 2 is replaced by the following:\n‘2.\nMinimum energy efficiency requirements for large power transformers\nMinimum efficiency requirements for large power transformers are set out in Tables I.7, I.8 and I.9.\nThere 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.\nIn those cases, the following fall-back provisions apply:\nAs 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.\nFurthermore, 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.\nAs 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.\nIn these cases, the manufacturer, importer or authorised representative responsible for placing on the market or putting into service the transformer shall:\ninclude in the technical documentation of the new or replacement transformer the following information:\naddress and contact details of the commissioner of the transformer,\nthe specific location where the transformer is to be installed,\nthe 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,\nnotify the competent national market surveillance authorities.\nTable I.7\nMinimum Peak Efficiency Index requirements for liquid immersed large power transformers\nRated Power (MVA)\nTier 1 (1.7.2015)\nTier 2 (1.7.2021)\nMinimum Peak Efficiency Index (%)\n≤ 0,025\n97,742\n98,251\n0,05\n98,584\n98,891\n0,1\n98,867\n99,093\n0,16\n99,012\n99,191\n0,25\n99,112\n99,283\n0,315\n99,154\n99,320\n0,4\n99,209\n99,369\n0,5\n99,247\n99,398\n0,63\n99,295\n99,437\n0,8\n99,343\n99,473\n1\n99,360\n99,484\n1,25\n99,418\n99,487\n1,6\n99,424\n99,494\n2\n99,426\n99,502\n2,5\n99,441\n99,514\n3,15\n99,444\n99,518\n4\n99,465\n99,532\n5\n99,483\n99,548\n6,3\n99,510\n99,571\n8\n99,535\n99,593\n10\n99,560\n99,615\n12,5\n99,588\n99,640\n16\n99,615\n99,663\n20\n99,639\n99,684\n25\n99,657\n99,700\n31,5\n99,671\n99,712\n40\n99,684\n99,724\n50\n99,696\n99,734\n63\n99,709\n99,745\n80\n99,723\n99,758\n100\n99,737\n99,770\n125\n99,737\n99,780\n160\n99,737\n99,790\n≥ 200\n99,737\n99,797\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.7 shall be calculated by linear interpolation\nTable I.8\nMinimum Peak Efficiency Index requirements for dry-type large power transformers with Um ≤ 36kV\nRated Power (MVA)\nTier 1 (1.7.2015)\nTier 2 (1.7.2021)\nMinimum Peak Efficiency Index (%)\n3,15 < Sr ≤ 4\n99,348\n99,382\n5\n99,354\n99,387\n6,3\n99,356\n99,389\n8\n99,357\n99,390\n≥ 10\n99,357\n99,390\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.8 shall be calculated by linear interpolation\nTable I.9\nMinimum Peak Efficiency Index requirements for dry-type large power transformers with Um > 36kV\nRated Power (MVA)\nTier 1 (1.7.2015)\nTier 2 (1.7.2021)\nMinimum Peak Efficiency Index (%)\n≤ 0,05\n96,174\n96,590\n0,1\n97,514\n97,790\n0,16\n97,792\n98,016\n0,25\n98,155\n98,345\n0,4\n98,334\n98,570\n0,63\n98,494\n98,619\n0,8\n98,677\n98,745\n1\n98,775\n98,837\n1,25\n98,832\n98,892\n1,6\n98,903\n98,960\n2\n98,942\n98,996\n2,5\n98,933\n99,045\n3,15\n99,048\n99,097\n4\n99,158\n99,225\n5\n99,200\n99,265\n6,3\n99,242\n99,303\n8\n99,298\n99,356\n10\n99,330\n99,385\n12,5\n99,370\n99,422\n16\n99,416\n99,464\n20\n99,468\n99,513\n25\n99,521\n99,564\n31,5\n99,551\n99,592\n40\n99,567\n99,607\n50\n99,585\n99,623\n≥ 63\n99,590\n99,626\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.9 shall be calculated by linear interpolation.’;\n(d) in point 3, the last subparagraph is replaced by:\n‘For medium and large power transformers only, the information under (a); (c) and (d) shall also be included on the rating plate of the transformer.’;\n(e) in point 4, the last paragraph is deleted,\nand a new point (d) is added as follows:\n(d) ‘the specific reason(s) why transformers are considered to be exempted from the Regulation in accordance with Article 1.2’;",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "The European Commission Better Regulation Toolbox suggest using a value of 4 % for the social discount rate https://ec.europa.eu/info/sites/info/files/file_import/better-regulation-toolbox-61_en_0.pdf ’;"
    },
    {
      "type": "footnote",
      "label": "f2",
      "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."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "The European Commission Better Regulation Toolbox suggest using a value of 4 % for the social discount rate https://ec.europa.eu/info/sites/info/files/file_import/better-regulation-toolbox-61_en_0.pdf’;"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2019/1783/annex/division/1",
    "retrieved_at": "2026-11-01T14:43:04.485690+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."
}