IEC60255-187-1:2021/COR1:2023 - 1 - @IEC 2023 INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE IEC60255-187-1 IEC 60255-187-1 Edition1.02021-07 Edition1.02021-07 MEASURING RELAYS AND PROTECTION RELAIS DE MESURE ET DISPOSITIFS DE EQUIPMENT- PROTECTION- Part 187-1:Functional requirements for Partie187-1:Exigencesfonctionnelles pour differential protection-Restrainedand laprotectiondifferentielle-Protection differentielle avec et sans caracteristique de unrestrained differential protection of motors, generators and transformers retenue des moteurs, generateurs et transformateurs CORRIGENDUM 1 Corrections to the French version appear after the English text. Les corrections a la version francaise sont donnees apres le texte anglais. Table 18 - Double infeed network model Replace, in the existing footnote c, in the first dashed list item, the words "zero winding losses (zero resistance and leakage reactance)" with "zero winding joule losses and leakage reactances". Table 20 - Double infeed network model Replace, in the existing footnote c, in the first dashed list item, the words "zero winding losses reactances". 6.4.4.2 Application specific considerations: transformer differential Replace, in the existing bulleted list item preceding Figure 30, in the second paragraph, the words"between sources A and B" with"of source A". 6.4.4.3 Application specific considerations: generator differential Replace, in the existing bulleted list item preceding Figure 32, in the second paragraph, the 6.4.4.4 Application specific considerations: motor differential Replace, in the existing bulleted list item preceding Figure 34, in the second paragraph, the IEC 60255-197-1:2021/COR1:2023 - 2 - @IEC2023 6.4.5.2 Application specific considerations: transformer differential Replace, in the existing bulleted list item preceding Figure 35, in the second paragraph, the words"between sources A and B" with "of source A". 6.4.7.2 Application specific considerations: transformer differential Replace, in the existing bulleted list item preceding Figure 40, in the second sentence of the second paragraph, number"2 560" with"2 048". Table 43 - Double infeed network model Replace, in the existing footnote c, the second dashed list item with the following item: infinite magnetizing impedance. Add, in the existing footnote c, after the existing dashed list, the following new paragraph: The zero-sequence impedance is modelled with the neutral-to-ground impedance ZN. Table 51 - Double infeed network model Delete, in the existing footnote c, the last dashed list item. Add, in the existing footnote c, after the dashed list, the following new paragraph: The zero-sequence impedance is modelled with the neutral-to-ground impedance ZN. 6.8.3.1 General Replace, in the existing paragraph following Table 67, the words "Formulae (17) to (22)" with "Formulae (16)to (21)". Figure A.7 - Phase-phase injection at delta side Replace the existing Figure A.7 with the following new figure: Winding 2 Winding 1 CT1 CT2 IINPUT JINPUT E.3.3 Dimensioning of cT2 Replace, in the existing paragraph immediately after the last formula, the word "cT1" with "CT2"