Fundamentals of lightning protection systems course no. Therefore, this catalogue provides you with some helpful information. The basis of conventional lightning protection technology. South african national standard protection against lightning physical damage to structures and life hazard warning can only be used in conjunction with the sans 62305 series.
Lightning strokeslightning strokes at i llihtia typical lightning lightning stroke shape stroke can last for over one second gg p over one second and consist of many strokes discharges, sometimes over. Pdf the art and science of lightning protection semantic. This paper presents an overview of the various types of lightning overvoltages that can arise on overhead power distribution networks, as well as typical voltage. The importance of lightning protection 6 7 key considerations identifying the need for both external and internal lightning protection for effective cover against lightning strikes technical design service 8 9. Today, lightning protection systems are in use on thousands of buildings. Master installer, master installer designer, and designer inspector certified individuals in good standing with the organization may order these stamps from lpi to promote their certification on drawings or other submittal information for projects. Lpi advocates use of lpiip as the thirdparty inspection.
Lightning protection level an overview sciencedirect. Lightning protection for buildings typical down conductor arrangements method 2 lightning protection for building bonding of extraneous equipment lightning protection test points provide a joint for test purposes at approximately 1m from finished floor level in an accessible location, unless otherwise detailed, on every down conductor. The calculation method primtech supports lightning calculations according to the din vde 0101 standard as well as the rollingsphere method derived from iec 623051 standard. Today, lightning protection systems are in use on thousands of buildings, homes, factories, towers, and even the space shuttles launch pad. Empirical design methods classical assume that the shielding device wire or mast can intercept all the lightning strokes arriving over the subject area if the shielding device maintains a certain geometrical relation separation and differential height to the protected object. It has been shown that in cases where damage has occurred to a protected structure, the damage was due to additions or repairs to the building or to deterioration or mechanical damage that was allowed to go undetected and unrepaired, or both. Amdt 2 2012 amended to replace the table on lightning ground flash density. The subject of surge protection is rather complicated and requires special knowledge. The use of nonpermanent protection methods has emerged in lightning protection in the last decade. None of these systems claims to protect against 100% of the possibility of a lightning stroke arriving near protective area. For a finite period, bs eniec 62305 and bs 6651 ran in parallel, but as of august 2008, bs 6651 has been withdrawn and now bs eniec 63205 is the. Zipse, fellow, ieee abstractthe successful 200yearold method of using a franklin rod to collect, control, and convey to earth the awesome and destructive power of lightning has produced other controversial, potential alternate methods. Preface with the increased use of sensitive electronic equipment and greater awareness of structural protection, the need for certified lightning protection is increasing. Earthing and lightning protection systems maintenance free download as word doc.
In practice, the rolling sphere method is widely used. Earthing and lightning protection systems maintenance. The multipoint discharge method of lightning protec tion was patented in 1930. Of explosion protection unwanted ignitions are older than mankind. Lightning protection standard the bs eniec 62305 standard for lightning protection was originally published in september 2006, to supercede the previous standard, bs 6651. This lightning conductor is made up of a 2 to 8 m high tapered metal rod that dominates the structure to be. The grounding methods presented in this handbook make a clear distinction between static grounding and power grounding. This chapter details methods of estimating lightning strike probabilities, the risk associated with this hazard and estimating the cost of this damage extended over the system life. Experimental analysis of preventive lightning protection. The 780 document covers many specialty constructions from hazardous materials storage to boats and ships to. Section 16050, basic methods and requirements electrical. Thus, documented methods for the special protection of equipment from lightning cannot be found in the two main codes or the lightning protection standard that are systematically referred to for practically all general construction in the united states. Topics include the types of damage, lightningstrike protection design principles, damage inspection methods, allowable damage limits, repairs, and restoration of protective methods. He evidently dis carded the dissipation method in favor of the rod.
Lightning protection level an overview sciencedirect topics. Using lightning protection rods and wires as lightning arresters, it visually illustrates the required results in form of the lightning protection volumes and areas. Lightning protection of buildings is a separate subject beyond the scope of this book. Lpi publishes this booklet, lpi 175, based on nfpa 780, with additional explanatory material helpful to installer and inspector member personnel. However, the refs 2, 3 can provide some useful overview on lightning protection systems covered by standards such as bseniec 62305. Politis 3 1 electrical and computer engineering, universi ty of patras. W the basics of lightning and surge protection 6690 20 w. Thus, documented methods for the special protection of equipment from lightning cannot be found in the two main codes or the lightning protection standard that are systematically referred to for practically. State of the art for the installation of lightning protection. As lightning seeks the path of the least resistance, it naturally tends to follow the shortest way between cloud and earth, such as buildings or towering projections. Bs eniec 62305 lightning protection general standard principles.
Examples of existing methods include geometrical constructions, such as the cone of protection and rolling sphere method which is based on electrogeometric models egms. Surge protection for electronics in lowvoltage electrical systems 7. Safeguarding your electrical systems why is transient overvoltage protection so important. In essence, structural lightning protection can no longer be considered in isolation, protection. Fundamentals of lightning protection systems page 1 of 14 fundamentals of lightning protection systems, edition 1c september 2011. Reflecting the latest protection methods, devices, and safety challenges, the 2017 edition of nfpa 780, standard for the installation of lightning protection systems is the new industry benchmark for protecting lives and property from fire and related dangers associated with lightning events. The lightning protection institute has approved the issuance of drawing stamps by the organization to promote member certifications. Standard for the installation of lightning protection systems. Additional training on understanding lightning effects on airplanes and inspection instructions may be requested through the boeing. The theory of using such methods were introduced to lightning protection as the socalled. It can serve as a useful guide to justify additional cost incurred by additioh. May 02, 2015 introduction to lightning protectionintroduction to lightning protection lightning definitionslightning definitions air terminal a strike termination device that is aair terminal a strike termination device that is a receptor for attachment of flashes to the lightningreceptor for attachment of flashes to the lightning protection. Benjamin franklin invented the lightning rod in 1753.
Lightning protection calculation lightning protection. Nfpa 780 includes lightning protection for typical building construction in chapter four as requirements for ordinary structures. Reflecting the latest protection methods, devices, and safety challenges, the 2017 edition of nfpa 780, standard for the installation of lightning protection systems is the new industry benchmark for. The importance of lightning protection 6 7 key considerations identifying the need for both external and internal lightning protection for effective cover against lightning strikes technical design service 8 9 not only do we supply lightning protection and earthing materials, we will also design the system you need. Lightning protection system design and installation. Bs 7671 18th edition transient overvoltage protection. Zipse, fellow, ieee abstractthe successful 200yearold method of using a franklin rod to collect, control, and convey to earth. Ul marking and application guides are updated as necessary due to new product development. Content types of protection 20 31 general requirements 20 types of protection to electrical equipment 21 types of protection to nonelectrical equipment 22 increased safety ex eb 23 non. Bs eniec 62305 lightning protection general standard. Protection zone of a lightning protection system may be defined as the volume of space inside which an air termination provides protection against a direct lightning strike by attracting the strike to itself 3. Pdf lightning protection guide 3rd updated edition adrian.
On completion of the installation the following isolated and combined testing measurement and or checks has to be made and the results. Lightning protection initially as part of an nfpa task force, since disbanded assembled for the purpose of responding to the nfpa standards committee decision 0030, specifically the request for technical substantiation of the lightning protection techniques and practice contained in modern lightning protection standards. Now the third revised edition of the english lightning protection guide is available. This chapter details methods of estimating lightning strike probabilities, the risk associated with this hazard and. Transient overvoltages are short duration surges in voltage between two or more conductors lpe, ln or npe, which can reach up to 6 kv on. The lightning protection system must be solidly and permanently grounded. Introduction to lightning protectionintroduction to lightning protection lightning definitionslightning definitions air terminal a strike termination device that is aair terminal a. The lightning phenomenon lightning is the phenomenon which accompanies the discharge of atmospheric charges from cloud to cloud or from cloud to earth. Types of lightning protection systems lps electrical knowhow. In 1955, the lightning protection institute lpi 4 was formed.
Information related to construction of facility radio frequency rf grounds. Pdf lightning protection guide 3rd updated edition. Information related to construction of facility radio frequency rf grounds, lightning grounds, power safety grounds, and sensitive equipment grounds are addressed in the. Lightning protection systems are the modern development of the innovation pioneered by benjamin franklin. Following summary paragraph on lightning protection levels lpl are based on this standard. General electrical requirements that are common to more than one section of.
Additional training on understanding lightning effects on airplanes and inspection instructions may be requested through the boeing airlines representative. Lightning strokeslightning strokes at i llihtia typical lightning lightning stroke shape stroke can last for over one second gg p over one second and consist of many strokes discharges, sometimes over ten, each with aneach with an arcchannel current of between 2ka and 200ka 1% of200ka 1% of strokes exceed 200ka. However, the refs 2, 3 can provide some useful overview on lightning protection systems covered by standards such as. Atmospheric discharges lightning triggered fi res long before humans walked the earth. In 1753 the fi rst lightning conductor was invented, enabling electrostatic hazards as the sources of ignition for fi res to be signifi cantly reduced. Buy nfpa 780, standard for the installation of lightning. This lightning conductor is made up of a 2 to 8 m high tapered metal rod that dominates the structure to be protected and which is connected to minimum two down conductors and two earthing system. Experimental analysis of preventive lightning protection methods. Faraday cages, topological shields and more practical approaches. The lightning protection institute is a nationwide notforprofit organization founded in 1955 to promote lightning protection education, awareness, and safety. Poor or high resistance connections to ground are the leading cause of lightning system failure for each one of these systems.
Lightning protection initially as part of an nfpa task force, since disbanded assembled for the purpose of responding to the nfpa standards committee decision 0030, specifically the request for technical. There are different methods of lightning protection systems. This is in part the reason why there is so much needless lightning damage. History of lightning protection system design in tactical systems i. The commonly used engineering tool for determining zone of protection of lightning protection system is the electrogeometric model. The lightning protection institute lpi adopts the latest edition of the nfpa 780 standard as its reference document for system design. State of the art for the installation of lightning protection systems 0. The lightning protection industry began in the united states when benjamin franklin postulated that lightning was electricity, and a metal rod could be used to carry the lightning. The basics of lightning and surge protection prevention is better than cure w. Acamj 2053b lightning protection f fuel systems acamj 206a acamj 20tbd lightning environment document acamj 20tbd zoning document nprmlnpa for part 23 t 1 nprmlnpa for. Lpi advocates use of lpiip as the thirdparty inspection authority for system design, components and installation.
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