IEC IEC61857-31 Edition 1.02017-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems-Procedures forthermal evaluation- Part 31:Applications witha designed life of 5000horless Systemesd'isolationélectrique-Proceduresd'évaluationthermique Partie31:Applications avec une durée devie de conception maximale de50oo h INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.080.30 ISBN 978-2-8322-5287-1 Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cettepublication via un distributeuragree. -2- IEC61857-31:2017IEC2017 CONTENTS FOREWORD INTRODUCTION. .5 Scope 1 6 2 Normativereferences 6 3 Terms and definitions 6 4 EIS evaluation 5 Test objects.. 6 Test procedures 6.1 Procedure A:Establishing a TEfor applications with a designed life of 15oohorless:one-temperatureageing. 6.2 Procedure B: Establishing a TE rating for applications with a designed life of 5ooohorless:one-temperatureageing.. 6.3 Procedure C: Establishing a TE rating for applications with a designed life of 5oooh orless: two-temperature ageing .... 8 Data analysis... 7 8 7.1 Analysis -Test Procedures A and B (See 6.1 and 6.2) .8 7.2 Analysis-Test Procedure C (See 6.3) Test report. 8 Bibliography 0 IEC61857-31:2017@IEC2017 - 3 - INTERNATIONALELECTROTECHNICALCOMMISSION ELECTRICALINSULATIONSYSTEMS-PROCEDURES FORTHERMALEVALUATION Part31:Applicationswithadesignedlifeof5oo0horless FOREWORD The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising 1） electrotechnical committees (IEC National Committees). The, object of ,IEC all national topromote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEc publishes International Standards, Technical Specifications. Technical Reports Publicly Available Specifications (PAS) and Guides (hereafter referred to as Publication(s)").Their preparation is entrusted to technical committees; any IEC National Committee interested the n governmental organizations liaising with the IEC also participate in this preparation.IEC collaborates closely with the International Organization for Standardization (IsO) in accordance with conditions determined by agreement between the two organizations. Theformal decisions or agreements of IEc on technical matters express,as nearly as possible, an international 2) interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense.While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEc cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. between any IEc Publication and the corresponding national or regional publication shall be clearly indicated in the latter. IEc itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEc is not responsible for any services carried out by independent certification bodies. All users should ensure that they have the latest edition of this publication. 6) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and 7) Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. Attention is drawn to the possibility that some of the elements of this IE Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61857-31 has been prepared by IEC technical committee 11