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BS EN 61810-2:2011

BS EN 61810-2:2011

$167.15

Electromechanical elementary relays – Reliability

Published By Publication Date Number of Pages
BSI 2011 38
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This part of IEC 61810 covers test conditions and provisions for the evaluation of endurance tests using appropriate statistical methods to obtain reliability characteristics for relays. It should be used in conjunction with IEC 61649.

This International Standard applies to electromechanical elementary relays considered as non-repaired items (i.e. items which are not repaired after failure), whenever a random sample of items is subjected to a test of cycles to failure (CTF).

The lifetime of a relay is usually expressed in number of cycles. Therefore, whenever the terms “time” or “duration” are used in IEC 61649, this term should be understood to mean “cycles”. However, with a given frequency of operation, the number of cycles can be transformed into respective times (e.g. times to failure (TTF)).

The failure criteria and the resulting characteristics of elementary relays describing their reliability in normal use are specified in this standard. A relay failure occurs when the specified failure criteria are met.

As the failure rate for elementary relays cannot be considered as constant, particularly due to wear-out mechanisms, the times to failure of tested items typically show a Weibull distribution. This standard provides both numerical and graphical methods to calculate approximate values for the two-parameter Weibull distribution, as well as lower confidence limits.

PDF Catalog

PDF Pages PDF Title
6 English

CONTENTS
7 INTRODUCTION
8 1 Scope
2 Normative references
9 3 Terms and definitions
11 4 General considerations
12 5 Test conditions
5.1 Test items
5.2 Environmental conditions
5.3 Operating conditions
13 5.4 Test equipment
6 Failure criteria
7 Output data
8 Analysis of output data
14 9 Presentation of reliability measures
15 Annex A (normative)Data analysis
18 Figures

Figure A.1 – An example of Weibull probability paper
20 Figure A.2 – An example of cumulative hazard plotting paper
Figure A.3 – Plotting of data points and drawing of a straight line
21 Figure A.4 – Estimation of distribution parameters
24 Annex B (informative)Example of numerical and graphical Weibull analysis
25 Tables

Table B.1 – Ranked failure data
26 Figure B.1 – Weibull probability chart for the example
28 Annex C (informative)Example of cumulative hazard plot
Table C.1 – Work sheet for cumulative hazard analysis
30 Figure C.1 – Estimation of distribution parameters
31 Table C.2 – Example work sheet
32 Figure C.2 – Cumulative hazard plots
34 Annex D (informative)Gamma function
Table D.1 – Values of the gamma function
35 Bibliography

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BS EN 61810-2:2011
$167.15