{
  "url": "https://openlegislation.uk/eu-regulation-2019-1783/annex/division-2",
  "json_url": "https://openlegislation.uk/eu-regulation-2019-1783/annex/division-2.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/2",
  "kind": "division",
  "number": "(2)",
  "heading": "Annex II is replaced by the following:",
  "text": "‘ANNEX II\nMeasurement methods\nFor 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.\nCalculation methods\nThe methodology for calculating the Peak Efficiency Index (PEI) for medium and large power transformers referred to in Tables I.4, I.5, I.7, I.8 and I.9 of Annex I 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. The calculation of PEI shall use state-of-the-art methodology available in the latest version of the relevant harmonised standards for medium and large power transformers.\nThe formula to be used for the Peak Efficiency Index calculation is:\nWhere:\nP0 is the no load losses measured at rated voltage and rated frequency on the rated tap\nPc0 is the electrical power required by the cooling system for no load operation, derived from the type test measurements of the power taken by the fan and liquid pump motors (for ONAN and ONAN/ONAF cooling systems Pc0 is always zero)\nPck (kPEI) is the electrical power required by the cooling system in addition to Pc0 to operate at kPEI times the rated load. Pck is a function of the load. Pck (kPEI) is derived from the type test measurements of the power taken by the fan and liquid pump motors (for ONAN cooling systems Pck is always zero).\nPk is the measured load loss at rated current and rated frequency on the rated tap corrected to the reference temperature\nSr is the rated power of the transformer or autotransformer on which Pk is based\nkPEI is the load factor at which Peak Efficiency Index occurs’;",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2019/1783/annex/division/2",
    "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."
}