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.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 3.2 Abbreviated terms <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4 Thunderstorm phases and detectable phenomena for alarming <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5 Description of thunderstorm detectors and their properties Tables Table 1 \u2013 Parameters related to sensor technologies <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6 Alarm method 6.1 General 6.2 Areas 6.2.1 Target (TA) Table 2 \u2013 Local sensor characteristics <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.2.2 Surrounding area (SA) 6.2.3 Monitoring area (MA) 6.2.4 Coverage area (CA) Figures Figure 1 \u2013 Examples of different target and surrounding areas <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.3 Alarm triggering and clearing Figure 2 \u2013 Principles of the coverage area (CA), the monitoring area (MA),the surrounding area (SA) and the target (TA) <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.4 Alarm information delivery 7 Installation Figure 3 \u2013 Example of an alarm Table 3 \u2013 Alarms related to LRE <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8 Maintenance 9 Performance evaluation 9.1 General <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 9.2 Evaluation of a TWS by cross-correlation with other sources of information <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 10 TWS application <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Annexes Annex A (informative) Overview of the lightning phenomena A.1 Origin of thunderclouds and electrification A.2 Lightning phenomena <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Figure A.1 \u2013 Standard lightning classifications <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex C (informative) Recommended preventive actions <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex D (informative) Example of TWS evaluation D.1 Example of TWS evaluation on a wind turbine site Figure D.1 \u2013 Lightning activity in the target (TA) in red and surrounding area (SA) in orange for a period of fifteen years (2000-2014) <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | D.2 Evaluation of TWS efficiency using LLS Table D.1 \u2013 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 <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Table D.2 \u2013 Example of delivered alarms evaluation <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 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) <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 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) <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | E.2.6 Electric tests <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | E.2.7 Marking test E.2.8 Electromagnetic compatibility (EMC) E.3 Optional tests on an open air platform under natural lightning conditions <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure E.1 \u2013 Difference in electric field measurement during one thunderstorm event <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex F (informative) Application guide F.1 General Table F.1 \u2013 Identification of typical hazardous situations where a TWS improves safety <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | F.2 Examples of application of a TWS F.2.1 Golf course F.2.2 Oil storage facility F.2.3 Crane <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | F.3 Selection of parameters of TWS Figure F.1 \u2013 Human risk calculated for a crane with LPS at level I <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure F.2 \u2013 Example of the alarms given by a TWS based on an EFS with three different field thresholds Table F.2 \u2013 Example of effect of settings on alarm performance <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure F.3 \u2013 Example of the alarms given by a TWS based on an LLS with three different radii of the monitoring area <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Thunderstorm warning systems. Protection against lightning<\/b><\/p>\n |