1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 41: Reliability predictionThe European Standard EN 62059-41:2006 has the status of a British S
2、tandardICS 91.140.50Electricity metering equipment Dependability BRITISH STANDARDBS EN 62059-41:2006BS EN 62059-41:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2006ISBN 0 580 48862 4Cross-referencesThe British Standard
3、s which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This pub
4、lication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cove
5、r, the EN title page, pages 2 to 23 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments present to the responsible international/European committee any enquiries on the interpretati
6、on, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.National forewordThis British Standard is the official
7、English language version of EN 62059-41:2006. It is identical with IEC 62059-41:2006.The UK participation in its preparation was entrusted to Technical Committee PEL/13, Electricity meters, which has the responsibility to: aid enquirers to understand the text;EUROPEAN STANDARD EN 62059-41 NORME EURO
8、PENNE EUROPISCHE NORM May 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any
9、form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62059-41:2006 E ICS 91.140.50 English version Electricity metering equipment - Dependability Part 41: Reliability prediction (IEC 62059-41:2006) Equipements de comptage de llectricit -Surt de fonctionnement Partie 41: Prvision
10、 de fiabilit (CEI 62059-41:2006) Wechselstrom-Elektrizittszhler -Zuverlssigkeit Teil 41: Zuverlssigkeitsvorhersage (IEC 62059-41:2006) This European Standard was approved by CENELEC on 2006-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi
11、tions for giving this European 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 th
12、ree official versions (English, 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 electrotechni
13、cal committees of Austria, Belgium, 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 Unite
14、d Kingdom. EN 62059-41:2006 Foreword The text of document 13/1348/FDIS, future edition 1 of IEC 62059-41, prepared by IEC TC 13, Equipment for electrical energy measurement and load control, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62059-41 on 2006-02-01. The
15、following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-02-01 Annex ZA has b
16、een added by CENELEC. _ Endorsement notice The text of the International Standard IEC 62059-41:2006 was approved by CENELEC as a European Standard without any modification. _ 2 3 EN 62059-41:2006 CONTENTS INTRODUCTION.4 1 Scope 5 2 Normative references .5 3 Terms, definitions and abbreviations .5 4
17、General information 9 5 Reliability analysis methods10 6 Reliability prediction using the parts stress method .11 6.1 Overview.11 6.2 Component failure rate data.12 6.3 Stress models .12 6.4 Failure rate prediction using the parts stress method13 6.5 Phases of the failure rate prediction process 13
18、6.6 Presentation of results.14 7 Other dependability considerations .14 8 Life time of life limited components .15 Annex A (normative) Reliability prediction Procedural flow .16 Annex B (informative) Overview of other reliability analysis and prediction methods 17 Annex ZA (normative) Normative refe
19、rences to international publications with their corresponding European publications23 Bibliography .21 EN 62059-41:2006 4 INTRODUCTION The main objective is to provide a tool for predicting the failure rate of electricity metering equipment using the parts stress method. It also provides an overview
20、 of reliability analysis and prediction methods. The result of the prediction can be used in the design phase to support design decisions, in relation with type approval to support decisions concerning the certification period and in the operation phase to determine the necessary maintenance perform
21、ance to obtain the required availability. 5 EN 62059-41:2006 ELECTRICITY METERING EQUIPMENT DEPENDABILITY Part 41: Reliability prediction 1 Scope This part of IEC 62059-41 is applicable to all types of static metering equipment for energy measurement and load control. 2 Normative references The foll
22、owing referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-191:1990, International Electrotechnical Vocabu
23、lary (IEV) Chapter 191: Depend-ability and quality of service Amendment 1(1999) Amendment 2 (2002) IEC 61709:1996, Electronic components Reliability Reference conditions for failure rates and stress models for conversion IEC 62059-11:2002, Electricity metering equipment Dependability Part 11: Genera
24、l concepts IEC 62059-21:2002, Electricity metering equipment Dependability Part 21: Collection of meter dependability data from the field 3 Terms, definitions and abbreviations For the purposes of this document, the following terms and definitions apply. NOTE Only those terms relevant to the subject
25、, which have not already been included in IEC 62059-11, are given here. 3.1 accelerated test test in which the applied stress level is chosen to exceed that stated in the reference conditions in order to shorten the time duration required to observe the stress response of the item, or to magnify the
26、 response in a given time duration NOTE To be valid, an accelerated test shall not alter the basic fault modes and failure mechanisms, or their relative prevalence. IEV 191-14-07 EN 62059-41:2006 6 3.2 administrative delay (for corrective maintenance) accumulated time during which an action of corre
27、ctive maintenance on a faulty item is not performed due to administrative reasons IEV 191-08-09 3.3 ageing failure, wearout failure failure whose probability of occurrence increases with the passage of time, as a result of processes inherent in the item IEV 191-04-09 3.4 constant failure intensity p
28、eriod that period, if any, in the life of a repaired item during which the failure intensity is approximately constant IEV 191-10-08 3.5 constant failure rate period that period, if any, in the life of a non-repaired item during which the failure rate is approximately constant IEV 191-01-09 3.6 equi
29、pment under prediction EUP static electricity metering equipment for which a reliability prediction is being made 3.7 failure cause circumstances during design, manufacture or use which have led to a failure IEV 191-04-17 3.8 failure intensity acceleration factor in a time interval of given duration
30、, whose beginning is specified by a fixed age of a repaired item, ratio of the number of failures obtained under two different sets of stress conditions IEV 191-14-12 3.9 (instantaneous) failure rate )(t limit, if it exists, of the quotient of the conditional probability that the instant of a failur
31、e of a non-repaired item falls within a given time interval (t, t + t) and the duration of this time interval, t, when t tends to zero, given that the item has not failed up to the beginning of the time interval 7 EN 62059-41:2006 NOTE 1 The instantaneous failure rate is expressed by the formula: )(
32、)()()()(1lim)(0 tRtftRtFttFttt=+= where F(t) and f(t) are respectively the distribution function and the probability density of the failure instant, and where R(t) is the reliability function, related to the reliability R(t1,t2) by R(t) =R(0,t). NOTE 2 An estimated value of the instantaneous failure
33、 rate can be obtained by dividing the ratio of the number of items which have failed during a given time interval to the number of non-failed items at the beginning of the time interval, by the duration of the time interval. NOTE 3 In English, the instantaneous failure rate is sometimes called “haza
34、rd function“. IEV 191-12-02 3.10 failure rate acceleration factor ratio of the failure rate under accelerated testing conditions to the failure rate under stated reference test conditions NOTE Both failure rates refer to the same time period in the life of the tested items. IEV 191-14-11 3.11 fault
35、state of an item characterized by inability to perform a required function, excluding the inability during preventive maintenance or other planned actions, or due to lack of external resources NOTE 1 A fault is often the result of a failure of the item itself, but may exist without prior failure. NO
36、TE 2 In English, the term “fault” is also used in the field of electric power systems with the meaning as given in 604-02-01: then the corresponding term in French is “dfaut”. IEV 191-05-01 3.12 maintenance combination of all technical and administrative actions, including supervision actions, inten
37、ded to retain an item in, or restore it to, a state in which it can perform a required function IEV 191-07-01 3.13 maintenance policy description of the interrelationship between the maintenance echelons, the indenture levels and the levels of maintenance to be applied for the maintenance of an item
38、 IEV 191-07-03 3.14 maintenance time time interval during which a maintenance action is performed on an item either manually or automatically, including technical delays and logistic delays NOTE Maintenance may be carried out while the item is performing a required function. IEV 191-08-01 EN 62059-4
39、1:2006 8 3.15 mean repair time MRT expectation of the repair time IEV 191-13-05 3.16 mean operating time between failures MTBF expectation of the operating time between failures IEV 191-12-09 3.17 mean time to failure MTTF expectation of the time to failure IEV 191-12-07 3.18 operating time time int
40、erval during which an item is in an operating state IEV 191-09-01 3.19 prediction process of computation used to obtain the predicted value(s) of a quantity NOTE The term “prediction” may also be used to denote the predicted value(s) of a quantity. IEV 191-16-01 3.20 redundancy in an item, existence
41、 of more than one means for performing a required function IEV 191-15-01 3.21 reference data data which, by general agreement, may be used as a standard or as a basis for prediction and/or comparison with observed data IEV 191-14-18 3.22 reliability model mathematical model used for prediction or es
42、timation of reliability performance measures of an item IEV 191-16-02 9 EN 62059-41:2006 3.23 (instantaneous) repair rate (t) limit, if this exists, of the ratio, of the conditional probability that the corrective maintenance action terminates in a time interval, (t, t +t) and the duration of this t
43、ime interval, t, when t tends to zero, given that the action had not terminated at the beginning of the time interval IEV 191-13-02 3.24 repair time that part of active corrective maintenance time during which repair actions are performed on an item IEV 191-08-16 3.25 required function function or a
44、 combination of functions of an item, which is considered necessary to provide a given service IEV 191-01-05 3.26 (steady-state) availability the mean of the instantaneous availability under steady-state conditions over a given time interval NOTE Under certain conditions, for instance constant failu
45、re rate and constant repair rate, the steady-state availability may be expressed by the ratio of the mean up time to the sum of the mean up time and mean down time. Under these conditions, asymptotic and steady state availability are identical and are often referred to as “availability”. IEV 191-11-
46、06 3.27 stress model mathematical model used to describe the influence of relevant applied stresses on a reliability performance measure or any other property of an item IEV 191-16-10 4 General information Reliability prediction methods are used to determine the probability that in a certain time in
47、terval, an EUP will be in the operating state, will be out of service or will be in the maintenance process. Results of such prediction methods can also indicate the percentage of equipment in a given population operating correctly, failed or being repaired, and the mean length of these intervals. R
48、eliability prediction is a statistical process reaching into the future, and it is based on information known from the past. The result therefore is always a probability of certain variables. To perform reliability predictions, detailed system knowledge and component reliability data are necessary.
49、It is important to distinguish between repairable and non-repairable items because the variables characterizing them are quite different, although there is a relationship between these variables. EN 62059-41:2006 10 In a non-repairable system, the Time To Failure (TTF) of the system components determines the useful life, during which the equipment performs its required functions with an
