BS-EN-61025-2007.pdf
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1、BRITISH STANDARD BS EN 61025:2007 Fault tree analysis (FTA) The European Standard EN 61025:2007 has the status of a British Standard ICS 03.120.01; 03.120.99; 29.020 ? Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c
2、) BSI BS EN 61025:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007 ISBN 978 0 580 54069 1 National foreword This British Standard is the UK implementation of EN 61025:2007. It is identical to IEC 61025:2006. It
3、supersedes BS 5760-7:1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee DS/1, Dependability and terotechnology. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to i
4、nclude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South
5、Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61025 NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnisc
6、he Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61025:2007 E ICS 03.120.01; 03.120.99 Supersedes HD 617 S1:1992 English version Fault tree analysis (FTA) (
7、IEC 61025:2006) Analyse par arbre de panne (AAP) (CEI 61025:2006) Fehlzustandsbaumanalyse (IEC 61025:2006) This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe
8、an Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (Engli
9、sh, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, B
10、elgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. License
11、d Copy: London South Bank University, London South Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 61025:2007 2 Foreword The text of document 56/1142/FDIS, future edition 2 of IEC 61025, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC paralle
12、l vote and was approved by CENELEC as EN 61025 on 2007-03-01. This European Standard supersedes HD 617 S1:1992. The main changes with respect to HD 617 S1:1992 are as follows: added detailed explanations of fault tree methodologies; added quantitative and reliability aspects of Fault Tree Analysis (
13、FTA); expanded relationship with other dependability techniques; added examples of analyses and methods explained in this standard; updated symbols currently in use. Clause 7, dealing with analysis, has been revised to address traditional logic fault tree analysis separately from the quantitative an
14、alysis that has been used for many years already, for reliability improvement of products in their development stage. Some material included previously in the body of this standard has been transferred to Annexes A and B. The following dates were fixed: latest date by which the EN has to be implemen
15、ted at national level by publication of an identical national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International S
16、tandard IEC 61025:2006 was approved by CENELEC as a European Standard without any modification. _ Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 EN 61025:2007 CONTENTS INTRODUCTION H 5 1 Scope .?H6 2 Normati
17、ve references ?H6 3 Terms and definitions ?H6 4 Symbols ?H9 5 General.?H10 5.1 Fault tree description and structure.?H10 5.2 Objectives ?H11 5.3 Applications?H11 5.4 Combinations with other reliability analysis techniques?H12 6 Development and evaluation?H14 6.1 General considerations.?H14 6.2 Requi
18、red system information.?H17 6.3 Fault tree graphical description and structure ?H18 7 Fault tree development and evaluation.?H19 7.1 General?H19 7.2 Scope of analysis .?H19 7.3 System familiarization.?H19 7.4 Fault tree development .?H19 7.5 Fault tree construction ?H20 7.6 Failure rates in fault tr
19、ee analysis .?H37 8 Identification and labelling in a fault tree ?H37 9 Report.?H38 Annex A (informative) Symbols .?H40 Annex B (informative) Detailed procedure for disjointing ?H47 Annex ZA (normative) Normative references to international publications with their corresponding European publications
20、52 Bibliography ?H51 ?HFigure 1 Explanation of terms used in fault tree analyses.?H9 ?HFigure 2 Fault tree representation of a series structure?H22 ?HFigure 3 Fault tree representation of parallel, active redundancy?H23 ?HFigure 4 En example of fault tree showing different gate types.?H25 ?HFigure 5
21、 Rectangular gate and events representation ?H26 ?HFigure 6 An example fault tree containing a repeated and a transfer event.?H27 ?HFigure 7 Example showing common cause considerations in rectangular gate representation .?H27 ?HFigure 8 Bridge circuit example to be analysed by a fault tree?H31 ?HFig
22、ure 9 Fault tree representation of the bridge circuit.?H32 ?HFigure 10 Bridge system FTA, Esary-Proschan, no disjointing?H34 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 61025:2007 4 ?HFigure 11 Bridge sy
23、stem probability of failure calculated with rare-event approximation?H35 ?HFigure 12 Probability of occurrence of the top event with disjointing.?H36 ?HFigure A.1 Example of a PAND gate?H46 ?HTable A.1 Frequently used symbols for a fault tree ?H40 ?HTable A.2 Common symbols for events and event desc
24、ription?H43 ?HTable A.3 Static gates ?H44 ?HTable A.4 Dynamic gates?H45 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:10:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 EN 61025:2007 INTRODUCTION Fault tree analysis (FTA) is concerned with the identificatio
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