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BS EN IEC 62793:2020

BS EN IEC 62793:2020

$189.07

Thunderstorm warning systems. Protection against lightning

Published By Publication Date Number of Pages
BSI 2020 50
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IEC 62793:2020(E) describes the characteristics of thunderstorm warning systems (TWSs) in order to implement lightning hazard preventive measures. Single sensors and/or a network of sensors (e.g. lightning location system) can be used as a TWS. This second edition cancels and replaces the first edition, published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – portable devices are no longer covered by this standard; – in Clause 5, classes of TWS have been deleted; – in Clause 6, updated figures and more detailed text are provided to better illustrate the alarm timeline; – in Clause 9, the text has been summarized and refers now to the application guide given in Annex F; – annexes have been reorganized; – Annex E is normative.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
13 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
16 3.2 Abbreviated terms
17 4 Thunderstorm phases and detectable phenomena for alarming
18 5 Description of thunderstorm detectors and their properties
Tables
Table 1 ā€“ Parameters related to sensor technologies
19 6 Alarm method
6.1 General
6.2 Areas
6.2.1 Target (TA)
Table 2 ā€“ Local sensor characteristics
20 6.2.2 Surrounding area (SA)
6.2.3 Monitoring area (MA)
6.2.4 Coverage area (CA)
Figures
Figure 1 ā€“ Examples of different target and surrounding areas
21 6.3 Alarm triggering and clearing
Figure 2 ā€“ Principles of the coverage area (CA), the monitoring area (MA),the surrounding area (SA) and the target (TA)
23 6.4 Alarm information delivery
7 Installation
Figure 3 ā€“ Example of an alarm
Table 3 ā€“ Alarms related to LRE
24 8 Maintenance
9 Performance evaluation
9.1 General
25 9.2 Evaluation of a TWS by cross-correlation with other sources of information
26 10 TWS application
27 Annexes
Annex A (informative) Overview of the lightning phenomena
A.1 Origin of thunderclouds and electrification
A.2 Lightning phenomena
28 Figure A.1 ā€“ Standard lightning classifications
29 A.3 Electric thunderstorm and lightning characteristics useful for prevention
A.3.1 Electrostatic field
A.3.2 Electromagnetic fields
A.3.3 Other parameters useful in lightning detection
31 Annex B (informative) Thunderstorm monitoring techniques
B.1 General
B.2 Single sensor detection techniques
B.2.1 Generalities
B.2.2 Detector based on electrostatic field
B.2.3 Detector based on electromagnetic field
32 B.3 Multi-sensor location techniques
B.3.1 Generalities
B.3.2 Magnetic direction finder (MDF)
B.3.3 Time of arrival (TOA)
B.3.4 Interferometry
33 Annex C (informative) Recommended preventive actions
34 Annex D (informative) Example of TWS evaluation
D.1 Example of TWS evaluation on a wind turbine site
Figure D.1 ā€“ Lightning activity in the target (TA) in red and surrounding area (SA) in orange for a period of fifteen years (2000-2014)
35 D.2 Evaluation of TWS efficiency using LLS
Table D.1 ā€“ Performance results of a TWS evaluation based on archived lightning data for a 15-year period (2000-2014), related to some of the key parameters
36 Table D.2 ā€“ Example of delivered alarms evaluation
37 Annex E (normative) How to test thunderstorm detectors
E.1 General
E.2 Laboratory tests
E.2.1 General
E.2.2 Resistance to UV radiation tests (for non-metallic sensor housing)
38 E.2.3 Resistance tests to corrosion (for metallic parts of sensor)
E.2.4 Mechanical tests
E.2.5 Index of protection confirmation (IP Code)
39 E.2.6 Electric tests
40 E.2.7 Marking test
E.2.8 Electromagnetic compatibility (EMC)
E.3 Optional tests on an open air platform under natural lightning conditions
41 Figure E.1 ā€“ Difference in electric field measurement during one thunderstorm event
43 Annex F (informative) Application guide
F.1 General
Table F.1 ā€“ Identification of typical hazardous situations where a TWS improves safety
44 F.2 Examples of application of a TWS
F.2.1 Golf course
F.2.2 Oil storage facility
F.2.3 Crane
45 F.3 Selection of parameters of TWS
Figure F.1 ā€“ Human risk calculated for a crane with LPS at level I
46 Figure F.2 ā€“ Example of the alarms given by a TWS based on an EFS with three different field thresholds
Table F.2 ā€“ Example of effect of settings on alarm performance
47 Figure F.3 ā€“ Example of the alarms given by a TWS based on an LLS with three different radii of the monitoring area
48 Bibliography

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BS EN IEC 62793:2020
$189.07