EN 61649:2008
Current
The latest, up-to-date edition.
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviations and symbols
3.1 Terms and definitions
3.2 Abbreviations
3.3 Symbols
4 Application of the techniques
5 The Weibull distribution
5.1 The two-parameter Weibull distribution
5.2 The three-parameter Weibull distribution
6 Data considerations
6.1 Data types
6.2 Time to first failure
6.3 Material characteristics and the Weibull distribution
6.4 Sample size
6.5 Censored and suspended data
7 Graphical methods and goodness-of-fit
7.1 Overview
7.2 How to make the probability plot
7.3 Hazard plotting
8 Interpreting the Weibull probability plot
8.1 The bathtub curve
8.2 Unknown Weibull modes may be "masked"
8.3 Small samples
8.4 Outliers
8.5 Interpretation of non-linear plots
9 Computational methods and goodness-of-fit
9.1 Introduction
9.2 Assumptions and conditions
9.3 Limitations and accuracy
9.4 Input and output data
9.5 Goodness-of-fit test
9.6 MLE - point estimates of the distribution parameters
beta and eta
9.7 Point estimate of the mean time to failure
9.8 Point estimate of the fractile (10%) of the time to
failure
9.9 Point estimate of the reliability at time t (t <= T)
9.10 Software programs
10 Confidence intervals
10.1 Interval estimation of beta
10.2 Interval estimation of eta
10.3 MRR Beta-binomial bounds
10.4 Fisher's Matrix bounds
10.5 Lower confidence limit for B[10]
10.6 Lower confidence limit for R
11 Comparison of median rank regression (MRR) and maximum
likelihood (MLE) estimation methods
11.1 Graphical display
11.2 B life estimates sometimes known as B or L percentiles
11.3 Small samples
11.4 Shape parameter beta
11.5 Confidence intervals
11.6 Single failure
11.7 Mathematical rigor
11.8 Presentation of results
12 WeiBayes approach
12.1 Description
12.2 Method
12.3 WeiBayes without failures
12.4 WeiBayes with failures
12.5 WeiBayes case study
13 Sudden death method
14 Other distributions
Annex A (informative) - Examples and case studies
Annex B (informative) - Example of computations
Annex C (informative) - Median rank tables
Annex D (normative) - Statistical Tables
Annex E (informative) - Spreadsheet example
Annex F (informative) - Example of Weibull probability paper
Annex G (informative) - Mixtures of several failure modes
Annex H (informative) - Three-parameter Weibull example
Annex I (informative) - Constructing Weibull paper
Annex J (informative) - Technical background and references
Annex ZA (normative) - Normative references to international
publications with their corresponding European
publications
Bibliography
IEC 61649:2008 provides methods for analysing data from a Weibull distribution using continuous parameters such as time to failure, cycles to failure, mechanical stress, etc. This standard is applicable whenever data on strength parameters, e.g. times to failure, cycles, stress, etc. are available for a random sample of items operating under test conditions or in-service, for the purpose of estimating measures of reliability performance of the population from which these items were drawn. The main changes with respect to the previous edition are as follows: the title has been shortened and simplified to read 'Weibull analysis'; and provision of methods for both analytical and graphical solutions have been added.
Committee |
CLC/SR 56
|
DevelopmentNote |
Supersedes UNE IEC 61649. (11/2011)
|
DocumentType |
Standard
|
PublisherName |
European Committee for Standards - Electrical
|
Status |
Current
|
Supersedes |
Standards | Relationship |
NBN EN 61649 : 2010 | Identical |
PN EN 61649 : 2008 | Identical |
DIN EN 61649:2009-03 | Identical |
I.S. EN 61649:2008 | Identical |
NEN EN IEC 61649 : 2008 | Identical |
IEC 61649:2008 | Identical |
CEI EN 61649 : 2010 | Identical |
NF EN 61649 : 2008 | Identical |
BS EN 61649:2008 | Identical |
UNE-EN 61649:2012 | Identical |
UNE-EN 61649:2008 | Identical |
I.S. EN 62059-31-1:2008 | ELECTRICITY METERING EQUIPMENT - DEPENDABILITY - PART 31-1: ACCELERATED RELIABILITY TESTING - ELEVATED TEMPERATURE AND HUMIDITY |
EN 62506 : 2013 | METHODS FOR PRODUCT ACCELERATED TESTING (IEC 62506:2013) |
EN 60947-4-1 : 2010 AMD 1 2012 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 4-1: CONTACTORS AND MOTOR-STARTERS - ELECTROMECHANICAL CONTACTORS AND MOTOR-STARTERS (IEC 60947-4-1:2009/A1:2012) |
BS EN 60947-4-1 : 2010 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 4-1: CONTACTORS AND MOTOR-STARTERS - ELECTROMECHANICAL CONTACTORS AND MOTOR-STARTERS |
BS EN 62506:2013 | Methods for product accelerated testing |
UNE-EN 62059-31-1:2010 | Electricity metering equipment - Dependability -- Part 31-1: Accelerated reliability testing - Elevated temperature and humidity |
BS EN 61810-2:2017 | Electromechanical elementary relays Reliability |
EN 61810-2:2017 | Electromechanical elementary relays - Part 2: Reliability |
EN 60947-1:2007/A2:2014 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES (IEC 60947-1:2007/A2:2014) |
CEI EN 62059-31-1 : 2009 | ELECTRICITY METERING EQUIPMENT - DEPENDABILITY - PART 31-1: ACCELERATED RELIABILITY TESTING - ELEVATED TEMPERATURE AND HUMIDITY |
BS EN 62059-31-1:2008 | Electricity metering equipment. Dependability Accelerated reliability testing. Elevated temperature and humidity |
CEI EN 61810-2 : 2012 | ELECTROMECHANICAL ELEMENTARY RELAYS - PART 2: RELIABILITY |
EN 62550:2017 | Spare parts provisioning |
UNE-EN 60947-4-1:2011 | Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters |
CEI EN 62506 : 2014 | METHODS FOR PRODUCT ACCELERATED TESTING |
BS EN 60947-1 : 2007 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES |
I.S. EN 62506:2013 | METHODS FOR PRODUCT ACCELERATED TESTING (IEC 62506:2013 (EQV)) |
I.S. EN 61810-2:2017 | ELECTROMECHANICAL ELEMENTARY RELAYS - PART 2: RELIABILITY |
BS EN 62550:2017 | Spare parts provisioning |
BS EN 61251:2016 | Electrical insulating materials and systems. A.C. voltage endurance evaluation |
I.S. EN 60947-1:2007 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES |
I.S. EN 60947-4-1:2010 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 4-1: CONTACTORS AND MOTOR-STARTERS - ELECTROMECHANICAL CONTACTORS AND MOTOR-STARTERS (IEC 60947-4-1:2009 (EQV)) |
EN 61251:2016 | Electrical insulating materials and systems - A.C. voltage endurance evaluation |
EN 62059-31-1 : 2008 | ELECTRICITY METERING EQUIPMENT - DEPENDABILITY - PART 31-1: ACCELERATED RELIABILITY TESTING - ELEVATED TEMPERATURE AND HUMIDITY |
EN 60300-3-4:2008 | Dependability management - Part 3-4: Application guide - Guide to the specification of dependability requirements |
IEC 60605-4:2001 | Equipment reliability testing - Part 4: Statistical procedures for exponential distribution - Point estimates, confidence intervals, prediction intervals and tolerance intervals |
ISO 2854:1976 | Statistical interpretation of data — Techniques of estimation and tests relating to means and variances |
EN 60300-3-2:2005 | Dependability management - Part 3-2: Application guide - Collection of dependability data from the field |
IEC 60300-3-4:2007 | Dependability management - Part 3-4: Application guide - Guide to the specification of dependability requirements |
IEC 60605-6:2007 | Equipment reliability testing - Part 6: Tests for the validity and estimation of the constant failure rate and constant failure intensity |
EN 60300-1:2014 | Dependability management - Part 1: Guidance for management and application |
EN 60300-3-1:2004 | Dependability management - Part 3-1: Application guide - Analysis techniques for dependability - Guide on methodology |
EN 61810-2:2017 | Electromechanical elementary relays - Part 2: Reliability |
IEC 61810-2:2017 | Electromechanical elementary relays - Part 2: Reliability |
DEFSTAN 00-971/1(1987) : 1987 | GENERAL SPECIFICATION FOR AIRCRAFT GAS TURBINE ENGINES |
IEC 60300-3-2:2004 | Dependability management - Part 3-2: Application guide - Collection of dependability data from the field |
ISO/TR 13425:2006 | Guidelines for the selection of statistical methods in standardization and specification |
IEC 60300-3-1:2003 | Dependability management - Part 3-1: Application guide - Analysis techniques for dependability - Guide on methodology |
IEC 61703:2016 | Mathematical expressions for reliability, availability, maintainability and maintenance support terms |
IEC 60300-1:2014 | Dependability management - Part 1: Guidance for management and application |
IEC 60300-2:2004 | Dependability management - Part 2: Guidelines for dependability management |
EN 60300-2:2004 | Dependability management - Part 2: Guidelines for dependability management |
EN 61703:2016 | Mathematical expressions for reliability, availability, maintainability and maintenance support terms |
IEC 60300-3-5:2001 | Dependability management - Part 3-5: Application guide - Reliability test conditions and statistical test principles |
ISO 3534-1:2006 | Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability |
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