IEC_60255-149_Ed.1.pdf

FORM CDV(IEC)2005-09-23 95/295/CDV COMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project number Numro de projet IEC 60255-149 Ed.1 IEC/TC or SC:CEI/CE ou SC:95 Secretariat/Secrtariat France Submitted for parallel voting in CENELEC Soumis au vote parallle au CENELEC Date of circulation Date de diffusion 2012-05-25 Closing date for voting(Voting mandatory for P-members)Date de clture du vote(Vote obligatoire pour les membres(P)2012-10-26 Also of interest to the following committees Intresse galement les comits suivants -Supersedes document Remplace le document 95/281/CD,95/291/CC 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 60255-149 Ed.1:Relais de mesure et dispositifs de protection Partie 149:Exigences fonctionnelles pour les relais lectriques thermiques Title:IEC 60255-149 Ed.1:Measuring relays and protection equipment Part 149:Functional requirements for thermal electrical relays Note dintroduction Introductory note 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 2012 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 60255-149/CDV IEC(E)CONTENTS 1 2 FOREWORD.4 3 1 Scope and object.6 4 2 Normative references.6 5 3 Terms and definitions.7 6 4 Specification of the function.8 7 4.1 General.8 8 4.2 Input energizing quantities/energizing quantities.9 9 4.3 Binary input signals.9 10 4.4 Functional logic.10 11 4.4.1 Equivalent heating current.10 12 4.4.2 Basic(setting)and operating current values for thermal protection.10 13 4.4.3 Thermal level calculation.11 14 4.4.4 Time-current limit characteristic equations and curves.12 15 4.4.4.1 Cold curve.12 16 4.4.4.2 Hot curve.13 17 4.4.5 Thermal level alarm threshold.14 18 4.5 Binary output signals.15 19 4.5.1 General.15 20 4.5.2 Operate(trip)output signal.15 21 4.5.3 Alarm signal.15 22 4.5.4 Other binary output signals.15 23 4.6 Additional influencing factors on thermal protection.15 24 4.6.1 General.15 25 4.6.2 Influence of ambient temperature on thermal protection.15 26 4.7 Behaviour of thermal protective device during auxiliary power supply failure.16 27 5 Performance specification.17 28 5.1 Accuracy related to the characteristic quantity.17 29 5.2 Accuracy related to the operate time.17 30 6 Functional test methodology.18 31 6.1 General.18 32 6.2 Determination of steady state errors related to the operating current value.18 33 6.3 Determination of steady state errors related to the characteristic quantity and 34 the operate time.19 35 6.3.1 Accuracy determination of the cold curve.19 36 6.3.2 Accuracy determination of the hot curves.20 37 6.4 Performance with specific cooling thermal time constant.20 38 6.5 Performance with harmonics.21 39 6.6 Performance during frequency variations.22 40 6.7 Performance during different ambient temperatures.22 41 7 Documentation requirements.23 42 7.1 Type test report.23 43 7.2 Other user documentation.24 44 Annex A(informative).25 45 60255-149/CDV IEC(E)3 Simple first-order thermal model of electrical equipment.25 46 A.1 General.25 47 A.2 Simple first-order thermal process representation of electrical equipment.25 48 A.3 Analogue thermal and electrical circuit models.28 49 A.4 Dynamics of a thermal protection system based on a simple first-order 50 thermal process.31 51 A.5 Solution in time domain for the thermal model differential equation as a 52 function of current and time limit.35 53 A.6 Derivation of the ambient temperature factor Fa.37 54 Annex B(informative).41 55 Bibliography.46 56 57 58 59 60