1、 IEC 62808 Edition 1.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Nuclear power plants Instrumentation and control systems important to safety Design and qualification of isolation devices Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sr
2、et Conception et qualification des appareils disolement IEC 62808:2015-05(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ele
3、ctronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please
4、 contact the address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y
5、 compris la photocopie et les microfilms, sans laccord crit de lIEC ou du Comit national de lIEC du pays du demandeur. Si vous avez des questions sur le copyright de lIEC ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit
6、national de lIEC de votre pays de rsidence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publ
7、ishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published.
8、 IEC Catalogue - webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents. Available for PC, Mac OS, Android Tablets and iPad. IEC publications search -
9、www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new
10、 IEC publications. Just Published details all new publications released. Available online and also once a month by email. Electropedia - www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and Frenc
11、h, with equivalent terms in 15 additional languages. Also known as the International Electrotechnical Vocabulary (IEV) online. IEC Glossary - std.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publica
12、tions issued since 2002. Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: cscie
13、c.ch. A propos de lIEC La Commission Electrotechnique Internationale (IEC) est la premire organisation mondiale qui labore et publie des Normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications IEC Le contenu technique des pub
14、lications IEC est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue IEC - webstore.iec.ch/catalogue Application autonome pour consulter tous les renseignements bibliographiques sur les Normes internationales, S
15、pcifications techniques, Rapports techniques et autres documents de lIEC. Disponible pour PC, Mac OS, tablettes Android et iPad. Recherche de publications IEC - www.iec.ch/searchpub La recherche avance permet de trouver des publications IEC en utilisant diffrents critres (numro de rfrence, texte, co
16、mit dtudes,). Elle donne aussi des informations sur les projets et les publications remplaces ou retires. IEC Just Published - webstore.iec.ch/justpublished Restez inform sur les nouvelles publications IEC. Just Published dtaille les nouvelles publications parues. Disponible en ligne et aussi une fo
17、is par mois par email. Electropedia - www.electropedia.org Le premier dictionnaire en ligne de termes lectroniques et lectriques. Il contient plus de 30 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans 15 langues additionnelles. Egalement appel Vocabulaire Elec
18、trotechnique International (IEV) en ligne. Glossaire IEC - std.iec.ch/glossary Plus de 60 000 entres terminologiques lectrotechniques, en anglais et en franais, extraites des articles Termes et Dfinitions des publications IEC parues depuis 2002. Plus certaines entres antrieures extraites des publica
19、tions des CE 37, 77, 86 et CISPR de lIEC. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 62808 Edition 1.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Nuclear power plants In
20、strumentation and control systems important to safety Design and qualification of isolation devices Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sret Conception et qualification des appareils disolement INTERNATIONAL ELECTROTECHNICAL COMMISSION
21、COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 27.120.20 ISBN 978-2-8322-2665-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. At
22、tention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 62808:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 Symbols and abbreviations 8 5 General principles for isolation devices 8 5.1
23、General . 8 5.2 Isolation characteristics 9 5.3 Actuation priority . 10 6 Isolation device design requirements . 10 6.1 Requirements on isolation device application 10 6.1.1 Isolation device power . 10 6.1.2 Maximum credible fault 10 6.1.3 Energy limiting devices 11 6.2 Requirements on isolation dev
24、ice design 11 6.2.1 Basic design requirements . 11 6.2.2 Postulated faults 12 6.2.3 Physical component arrangement 12 6.3 Power isolation devices 13 6.3.1 General . 13 6.3.2 Circuit breaker tripped by fault currents . 13 6.3.3 Circuit breaker tripped by fault signals . 13 6.3.4 Input current limiter
25、s 13 6.3.5 Fuses 13 7 Qualification test requirements 13 7.1 General . 13 7.2 Requirements on the test method 14 7.2.1 Test specification . 14 7.2.2 Testing energy limiting devices 14 7.2.3 Qualification test environment 14 7.3 Application specific testing 15 7.3.1 General . 15 7.3.2 Isolation of sa
26、fety circuits from lower class circuits 15 7.3.3 Isolation between redundant safety circuits 15 7.4 Documentation of test requirements and results 15 Bibliography 16 Figure 1 Application of maximum credible fault 11 Figure 2 Application of postulated fault 12 IEC 62808:2015 IEC 2015 3 INTERNATIONAL
27、ELECTROTECHNICAL COMMISSION _ NUCLEAR POWER PLANTS INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY DESIGN AND QUALIFICATION OF ISOLATION DEVICES FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotech
28、nical committees (IEC National Committees). The object of IEC is to promote 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
29、, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, go
30、vernmental and non- 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. 2) The formal decisio
31、ns or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for internat
32、ional 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. 4) In order
33、 to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clear
34、ly indicated in the latter. 5) 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 bo
35、dies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, proper
36、ty damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in th
37、is publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any o
38、r all such patent rights. International Standard IEC 62808 has been prepared by subcommittee 45A: Instrumentation, control and electrical systems of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation. The text of this standard is based on the following documents: FDIS Report
39、on voting 45A/1004/FDIS 45A/1019/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 IEC 62808:2015 IEC 2015 The committee has de
40、cided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amen
41、ded. IEC 62808:2015 IEC 2015 5 INTRODUCTION a) Technical background, main issues and organisation of the standard I in Clause 6: to establish design requirements on the selection and application of suitable isolation devices; in Clause 7: to establish requirements on qualification testing done to va
42、lidate the adequacy of the isolation device design. It is intended that the standard be used by operators of NPPs (utilities), designers of nuclear I&C system and equipment, systems evaluators and regulators. b) Situation of the current standard in the structure of the IEC SC 45A standard series IEC
43、 62808 is the third level IEC SC 45A document tackling the issue of isolation devices. IEC 60709 is directly referenced by IEC 61513 in regard to physical and electrical separation being required between subsystems of different safety trains of I&C systems important to safety, and between I&C system
44、s important to safety and those that are not important to safety. IEC 61226 establishes the principles of categorization of I&C functions, systems and equipment according to their level of importance to safety. It then requires that adequate separation be provided between functions of different cate
45、gories. IEC 61226 refers to IEC 60709 as a normative standard regarding requirements of separation. IEC 62808 is intended to provide requirements and recommendations relating to the design and qualification of isolation devices which are identified in IEC 60709 as a means of achieving independence b
46、etween systems when signals are extracted from a system for use in lower class systems, or between independent subsystems of the same classes. For more details on the structure of the IEC SC 45A standard series, see item d) of this introduction. 6 IEC 62808:2015 IEC 2015 c) Recommendations and limit
47、ations regarding the application of this standard IEC 60709 applies to I&C systems and equipment important to safety. It establishes requirements for physical and electrical separation as one means to provide independence between the functions performed in those systems and equipment. IEC 60709 requ
48、ires the use of isolation devices where connections between independent systems must be made. IEC 62808 provides criteria for the analysis and qualification of the the isolation device. A fundamental criterion for isolation devices is that they be included in, and designed to, the standards of the h
49、igher class system for which they provide protection against hazards. Additional requirements relating to design and qualification of an isolation device as an element of a safety system are not given in this standard. d) Description of the structure of the IEC SC 45A standard series and relationships with other IEC documents and other bodies documents (IAEA, ISO) The top-level document of the IEC SC 45A standard s
