GB/T 21711.2-2024 English PDF

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GB/T 21711.2-2024: Electromechanical elementary relays - Part 2: Reliability
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21711.2-2024	694	Add to Cart	6 days	Electromechanical elementary relays - Part 2: Reliability	Valid

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Basic data

Standard ID: GB/T 21711.2-2024 (GB/T21711.2-2024)
Description (Translated English): Electromechanical elementary relays - Part 2: Reliability
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L25
Classification of International Standard: 29.120.70
Word Count Estimation: 34,388
Date of Issue: 2024-03-15
Date of Implementation: 2024-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21711.2-2024: Electromechanical elementary relays - Part 2: Reliability

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29.120.70 CCSL25 National Standards of People's Republic of China Basic Electromechanical Relays Part 2.Reliability (IEC 61810-2.2017,IDT) Released on 2024-03-15 2024-07-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General Principles 3 5 Test conditions 4 5.1 Sample 4 5.2 Environmental conditions 5 5.3 Working conditions 5 5.4 Test equipment 5 6 Failure criteria 5 7 Output Data 6 8 Output Data Analysis 6 9 Reliability Measurement 6 Appendix A (Normative) Data Analysis 7 Appendix B (Informative) Data Analysis Example 16 Appendix C (Informative) Statistical Table 25 Appendix D (Informative) Successful operation---no failure test 27 References 29 Figure A.1 Weibull Probability Plotting Paper Example 9 Figure A.2 Example of cumulative failure rate plotting paper 10 Figure A.3 Plotted data points and drawn straight line 11 Figure A.4 Estimation of distribution parameters 11 Figure B.1 Distribution parameter estimation 18 Figure B.2 Cumulative failure rate Figure 20 Figure B.3 Comparison of periodic tests with type test and Weibull Bayesian analysis 24 Table A.1 Weibull Bayesian confidence level for zero failures15 Table B.1 Cumulative failure rate analysis record table 16 Table B.2 Record table example 18 Table B.3 Data of the first 20 failed products in this case 21 Table C.1 Gamma function value 25 Table C.2 Quantile values of normal distribution 26 Table D.1 Number of samples and life cycle times 28

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is part 2 of GB/T 21711 "Basic electromechanical relays". GB/T 21711 has been published in the following parts. --- Part 1.General and safety requirements; --- Part 2.Reliability; --- Part 2-1.Reliability B10 value verification procedure; --- Part 7.Test and measurement procedures. This document is equivalent to IEC 61810-2.2017 "Basic electromechanical relays Part 2.Reliability". For ease of use, this document is Made the following editorial changes. a) Corrected the typo in the last paragraph of 5.3, changing "Table 12" to "Table 16"; b) Corrected the typos in A.5.1.4 and A.5.2.2, and changed “Appendix D” to “Appendix C”; c) The typo in Figure A.4 was corrected, and the horizontal axis "β^10" was changed to "B^10"; d) Corrected the typo in B.3.2.“(w1β^;w2β^)” was changed to “(w1β^,w2β^)”; e) Corrected the typo in B.3.3.“(A1η^;A2η^)” was changed to “(A1η^,A2η^)”; f) Corrected the typo in D.2.the symbol “R(c)” was changed to “R(c)”, the symbol “F(c)” was changed to “F(c)”, and the symbol “R(a)” was changed to is "R(a)", and the symbol "c(a)" is changed to "c(a)"; g) Corrected the typo in D.3.“Confidence level F(c)=0.90” was changed to “Confidence level is 0.90”. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This document is under the jurisdiction of the National Technical Committee for Standardization of Electrical Relays (SAC/TC217). This document was drafted by. Xiamen Hongfa Electroacoustic Co., Ltd., Harbin Institute of Technology, and China Electronics Technology Standardization Institute. The main drafters of this document are. Lin Weilin, You Jiaxin, Lu Ningyi, Zhou Yanmei, Xu Le, Zhai Guofu, and Wang Jue.

Introduction

In order to standardize the development, testing, quality assessment and use of relay products in my country and promote the steady and coordinated development of the relay industry, this GB/T 21711 "Basic Electromechanical Relays" series of standards. GB/T 21711 "Basic Electromechanical Relays" is a series of standards for various basic electromechanical relays. The basic product specification is planned to consist of 7 parts. --- Part 1.General and safety requirements. The purpose is to determine the basic electromechanical relays used in various fields of electrical or electronic engineering Functional and safety requirements and safety related characteristics. --- Part 2.Reliability. The purpose is to standardize the requirements for reliability assessment of basic electromechanical relays. --- Part 2-1.Reliability B10 value verification procedure. The purpose is to standardize the reliability index assessment of basic electromechanical relays and reliability growth requirements assessment requirements. --- Part 3.Forced positioning (mechanical interlocking) contact relays. The purpose is to add applicable Special requirements for forced positioning (mechanical interlocking) contact relays. --- Part 4.General and safety requirements for reed relays. The purpose is to provide reed relays suitable for general control circuits. Establish basic functional and safety requirements. --- Part 7.Test and measurement procedures. The purpose is to specify the test and measurement procedures applicable to basic electromechanical relays. --- Part 10.Additional functional characteristics and safety requirements for large capacity relays. The purpose is to build on the general requirements of Part 1 In addition, additional functional characteristics and safety requirements applicable to large-capacity relays are added. Basic Electromechanical Relays Part 2.Reliability

1 Scope

This document specifies the test conditions and details for evaluating the durability of relays using appropriate statistical methods to obtain reliable The characteristic value of sex. This document applies to basic electromechanical relays that are considered non-repairable products (i.e. products that are not repaired after failure). It is usually expressed in terms of cycle times (CTF). Therefore, when the terms "time" or "duration" are used in GB/T 34987-2017 However, at a given operating frequency, the number of cycles can be converted into a corresponding time (such as failure Previous time TTF). This document specifies the failure criteria and resulting characteristic values that describe the reliability of basic relays in normal use. When the failure criterion is met, relay failure occurs. The failure rate of basic relays cannot be considered constant, especially the failure rate caused by wear and tear mechanism. The number of rings is usually presented as a Weibull distribution. This document specifies numerical and graphical methods for calculating the approximate value of the two-parameter Weibull distribution, and Confidence limits and methods for confirming reliability measures using the Weibull Bayes method. This document does not include procedures for use with additional reliability verification requirements for basic electromechanical relays. NOTE 1 This reliability test procedure is specified in IEC 61810-2-1 and is intended, in particular, for the assembly of basic electromechanical relays in accordance with IEC 62061 and GB/T 16855.1 specifies the test for providing B10D value for safety-related mechanical control systems, while IEC 61810-2-1 specifies the test for providing B10D value for manufacturers. program. Note 2.Basic electromechanical relays with forced positioning (mechanical interlocking) contacts in accordance with IEC 61810-3 can provide contact protection in accordance with GB/T 16855.1-2018 High diagnostic coverage as specified in 4.5.3.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 21711.1-2023 Basic electromechanical relays Part 1.General and safety requirements (IEC 61810-1.2015, IDT) GB/T 34987-2017 Weibull analysis (IEC 61649.2008, IDT)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Product Any component that can be considered individually. Note. In this document, the product is a basic electromechanical relay. 3.2 Non-repaired products Products that are not repaired after failure. ......

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