IEC_60076-2_Ed.3.pdf

FORM FDIS(IEC)/FORMULAIRE FDIS(CEI)2009-01-09 Registered trademark of the International Electrotechnical Commission 14/669/FDISFINAL DRAFT INTERNATIONAL STANDARDPROJET FINAL DE NORME INTERNATIONALEProject number Numro de projet IEC 60076-2 Ed.3 IEC/TC or SC CEI/CE ou SC 14 Secretariat/Secrtariat BSI-UK Submitted for parallel voting in CENELEC Soumis au vote parallle au CENELEC Distributed on/Diffus le 2010-10-22 Voting terminates on/Vote clos le 2011-01-07 Also of interest to the following committees Intresse galement les comits suivants-Supersedes document Remplace le document 14/613/CDV,14/640/RVC Horizontal standard Norme horizontale Other TC/SCs are requested to indicate their interest,if any,in this FDIS to the TC/SC secretary Les autres CE/SC sont requis dindiquer leur intrt,si ncessaire,dans ce FDIS lintention du secrtaire du CE/SC Functions concerned Fonctions concernes Safety Scurit EMC CEM Environment Environnement Quality assurance Assurance de la qualit CE DOCUMENT EST UN PROJET DIFFUS POUR APPROBATION.IL NE PEUT TRE CIT COMME NORME INTERNATIONALE AVANT SA PUBLICATION EN TANT QUE TELLE.OUTRE LE FAIT DTRE EXAMINS POUR TABLIR SILS SONT ACCEPTABLES DES FINS INDUSTRIELLES,TECHNOLOGIQUES ET COMMERCIALES,AINSI QUE DU POINT DE VUE DES UTILISATEURS,LES PROJETS FINAUX DE NORMES INTERNATIONALES DOIVENT PARFOIS TRE EXAMINS EN VUE DE LEUR POSSIBILIT DE DEVENIR DES NORMES POUVANT SERVIR DE RFRENCE DANS LES RGLEMENTATIONS NATIONALES.LES RCIPIENDAIRES DU PRSENT DOCUMENT SONT INVITS PRSENTER,AVEC LEURS OBSERVATIONS,LA NOTIFICATION DES DROITS DE PROPRIT DONT ILS AURAIENT VENTUELLEMENT CONNAISSANCE ET FOURNIR UNE DOCUMENTATION EXPLICATIVE.THIS DOCUMENT IS A DRAFT DISTRIBUTED FOR APPROVAL.IT MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL,TECHNOLOGICAL,COMMERCIAL AND USER PURPOSES,FINAL DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,WITH THEIR COMMENTS,NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.Titre CEI 60076-2 Ed.3:Transformateurs de puissance Partie 2:Echauffement des transformateurs immergs dans le liquide Title IEC 60076-2 Ed.3:Power transformers Part 2:Temperature rise for liquid-immersed transformers ATTENTION VOTE PARALLLE CEI CENELEC Lattention des Comits nationaux de la CEI,membres du CENELEC,est attire sur le fait que ce projet finale de Norme internationale est soumis au vote parallle.Les membres du CENELEC sont invits voter via le systme de vote en ligne du CENELEC.ATTENTION IEC CENELEC PARALLEL VOTING The attention of IEC National Committees,members of CENELEC,is drawn to the fact that this final draft International Standard(DIS)is submitted for parallel voting.The CENELEC members are invited to vote through the CENELEC online voting system.Copyright 2010 International Electrotechnical Commission,IEC.All rights reserved.It is permitted to download this electronic file,to make a copy and to print out the content for the sole purpose of preparing National Committee positions.You may not copy or mirror the file or printed version of the document,or any part of it,for any other purpose without permission in writing from IEC.2 60076-2/FDIS IEC CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 Cooling methods.8 4.1 Identification symbols.8 4.2 Transformers with alternative cooling methods.9 5 Normal cooling conditions.9 5.1 Air-cooled transformers.9 5.2 Water-cooled transformers.10 6 Temperature rise limits.10 6.1 General.10 6.2 Temperature rise limits at rated power.10 6.3 Modified requirements for special cooling conditions.12 6.3.1 General.12 6.3.2 Air-cooled transformers.12 6.3.3 Water-cooled transformers.13 6.4 Temperature rise during a specified load cycle.13 7 Temperature rise tests.13 7.1 General.13 7.2 Temperature of the cooling media.13 7.2.1 Ambient temperature.13 7.2.2 Water temperature.14 7.3 Test methods for temperature rise determination.14 7.3.1 General.14 7.3.2 Test by short-circuit method for two winding transformers.14 7.3.3 Test modification for particular transformers.15 7.4 Determination of liquid temperatures.16 7.4.1 Top-liquid temperature.16 7.4.2 Bottom and average liquid temperatures.17 7.5 Determination of top,average and bottom liquid temperature rises.18 7.6 Determination of average winding temperature.18 7.7 Determination of winding resistance at the instant of shutdown.19 7.8 Determination of average winding temperature rise at the instant of shutdown.19 7.9 Determination of the average winding to liquid temperature gradient.19 7.10 Determination of the hot-spot winding temperature rise.20 7.10.1 General.20 7.10.2 Determination by calculation.20 7.10.3 Direct measurement during the temperature rise test.20 7.11