IEC_60076-18_Ed.1.pdf

FORM CDV(IEC)2009-01-09 Registered trademark of the International Electrotechnical Commission 14/687/CDV COMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project number Numro de projet IEC 60076-18 Ed.1 IEC/TC or SC:CEI/CE ou SC:14 Secretariat/Secrtariat United Kingdom Submitted for parallel voting in CENELEC Soumis au vote parallle au CENELEC Date of circulation Date de diffusion 2011-04-29 Closing date for voting(Voting mandatory for P-members)Date de clture du vote(Vote obligatoire pour les membres(P)2011-09-30 Also of interest to the following committees Intresse galement les comits suivants -Supersedes document Remplace le document 14/626/CD&14/632A/CC Proposed horizontal standard Norme horizontale suggre Other TC/SCs are requested to indicate their interest,if any,in this CDV to the TC/SC secretary Les autres CE/SC sont requis dindiquer leur intrt,si ncessaire,dans ce CDV lintention du secrtaire du CE/SC Functions concerned Fonctions concernes Safety Scurit EMC CEM Environment Environnement Quality assurance Assurance qualit CE DOCUMENT EST TOUJOURS LTUDE ET SUSCEPTIBLE DE MODIFICATION.IL NE PEUT SERVIR DE RFRENCE.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 STILL UNDER STUDY AND SUBJECT TO CHANGE.IT SHOULD NOT BE USED FOR REFERENCE PURPOSES.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 60076-18 Ed.1:Transformateurs de puissance Partie 18:Mesure de la rponse en frquence Title:IEC 60076-18 Ed.1:Power transformers Part 18:Measurement of frequency response ATTENTION VOTE PARALLLE CEI CENELEC Lattention des Comits nationaux de la CEI,membres du CENELEC,est attire sur le fait que ce projet de comit pour vote(CDV)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 Committee Draft for Vote(CDV)for an International Standard is submitted for parallel voting.The CENELEC members are invited to vote through the CENELEC online voting system.Copyright 2011 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.This standard has been drafted to provide a basis for the performance of frequency response measurements on power transformers both as a benchmark and subsequently to detect damage.The document has been revised following comments received on the CD.Particular revisions are:Incorporation of different measurement lead arrangement methods if they are required for compatibility or measurement efficiency(annex A).Revisions to the requirements for instruments Revisions to diagrams Completion of the annexes Comments are particularly sought on the following points:Whether particular measuring impedances in addition to the proposed 50 ohms should be allowed in the standard.Changing this impedance to accommodate a wider range of measurement techniques would mean that incompatible results could be obtained from different instruments.Whether measuring techniques that do not provide information at frequencies below 5kHz should be excluded by the standard.Generally measurements between 10Hz and 5kHz are used to detect abnormalities in the core and turn to turn failure.It is recognised that it is difficult for measurements based on the impulse technique to provide accurate information in this low frequency range,but it is believed that the majority of instruments and measurements in use can comply with the standard as written in the CDV.60076-18/CDV IEC:201X 1 CONTENTS 1 Scope.5 2 Normative references.5 3 Definitions.5 3.1 Frequency response.5 3.2 Frequency response analysis(FRA).5 3.3 Source lead.5 3.4 Reference lead(Vin).5 3.5 Response lead(Vout).5 3.6 End-to-end measurement.5 3.7 apacitive inter-winding measurement.5 3.8 Inductive inter-winding measurement.6 3.9 End-to-end short circuit inter-winding measurement.6 4 Purpose of frequency response measurements.6 5 Measurement method.6 5.1 General.6 5.2 Condition of the test object during measurement.7 5.3 Measurement connection and checks.8 5.3.1 Measurement connection and earthing.8 5.3.2 Zero-check measurement.8 5.3.3 Repeatability check.8 5.3.4 Instrument performance check.9 5.4 Measurement configuration.9 5.4.1 General.9 5.4.2 Principles for choosing the measurement configuration.9 5.4.3 Star and auto connected windings with a