Designing a lightning protection system using the protective angle, mesh and rolling sphere methods. The basis of conventional lightning protection technology. Evaluation of rolling sphere method using leader potential. Ground system design ground rods conductors and connections current flow in the ground. Any high point in the vicinity such as an electricity pylon or a lightning rod. Methods will be presented to enable engineers to incorporate them.
The placement of air terminals in a lightning protection system is critical for optimal protection. This report investigates the discharge mechanism and discusses the principles of lightning protection and the way this is applied to the protection of structures. The protective angle design method cannot be used where the. The as1768 standard endorsed the lightning safety design based on the rolling sphere method.
For a finite period, bs eniec 62305 and bs 6651 ran in parallel, but as of august 2008, bs 6651 has been withdrawn and now bs eniec 63205 is the. Fundamentals of lightning protection systems, edition 1c september 2011. Calculate no of down conductor for lightning protection area of building structure. Design guidelines for shielding effectiveness, current. History of lightning protection system design in tactical systems i. Physical damage to structures and life hazard software for design and calculation of lightning protection systems when designing lightning protection systems, various parameters must be taken into account. The class of lpslpl influences on the 3 positioning methods. Notes on strike terminations while these methods dictate the placement of the strike terminations to determine zones of. During thunderstorms too, high volume of energy is instantaneously released which is more common in nature.
For information on lightning test methods, see sae arp 5416. Suitability of airtermination forms and design methods. Lightning protection for offshore oil installations. Necessity of employment of active influence on lightning in contemporary lightning protection, 25 th international conference on lightning protection, september 2002, krakow, poland. Lightning protection principles knowledge of the mechanism of the lightning discharge enables an understanding of the way in which lightning detection and warning systems operate. Development of existing lightning protection standards, in the u. Contrary to the myths, lightning protection systems. In 1753 the fi rst lightning conductor was invented, enabling electrostatic hazards as the sources of ignition. 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. Protection principles 14 design regulations and prevention of effective sources of ignition in devices 15 standards for explosion protection 16 19 technical development. A risk assessment based on actual lightning exposure design of the air termination network and downconductors di fth tht i ti t k d thdesign of the earth termination network and earth electrodes. Designing to the iec 62305 series of lightning protection standards. Selection of protection levels for lps iec 6102411 damages,losses, protection measures selection data required, risk.
This manual is intended as a guide for electrical engineers and designers hereafter referred as. Fundamentals of lightning protection systems course no. Copper lightning protection materials shall not becopper lightning protection materials shall not be installed on aluminum roofing, siding or otherinstalled on. Lightning protection systems what they do and dont do. Ieee std 9981996, ieee guide for direct lightning stroke. Pdf lightning protection for buildings energized by. These can induce damaging currents into conductors and devicesconductors and devices. Methods for determining adequate conductivity levels for various. Lightning protection system palace of festivals of. Lightning stock flushing density number of thunderstorm. Examples of existing methods include geometrical constructions, such as the cone of protection and. A design method is normally used to identify the most suitable locations for the lightning rods, based on the area of protection offered by each one. Lightning protection system design and installation.
For information on lightning zoning methods and lightning environment definition, see ac 20155, sae documents to support aircraft lightning protection certification. Lightning protection initially as part of an nfpa task force, since disbanded assembled for. Design guidelines for proper lightning protection system. Special electrical protection lightningprotectioninstitute. Iec 62305 also introduces four lightning protection levels lpl iiv. Bs eniec 62305 lightning protection standard the bs eniec 62305 standard for lightning protection was originally published in september 2006, to supercede the previous standard, bs 6651. There are different methods of lightning protection systems. Sans 10225, the design and construction of lighting masts. Knowing the steps of lightning protection system design process. A full manual analysis of all risks can take tens of hours to complete. Lightning protection system design and calculations. Design methods 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. Bs eniec 62305 lightning protection general standard. Our dedicated teams of engineers are available around.
However, the pro tection provided depends crucially on the quality of the installation. Design guidelines for the materials for lightning protection conductors and method for their installation are given in detail in the applicable engineering standards. Strike terminations for lightning protection systems 1 metal masts must have sufficient material properties e. Lightning protection for buildings energized by renewable energy sources. The standards define an effective lightning protection system as a set of equipment and devices to capture never to attract lightning and conduct it safely to ground.
Pdf lightning protection techniques for rooftop pv systems. The installation of a lightning protection system using rods and meshed conductors must follow the standards iec62305 lightning protection. April 2002 design standard for flight flightguidance systems. Ieee guide for direct lightning stroke shielding of substations 1. Protection systems considered the national design guide for complete lightning protection systems in the united states. Protection measures such as the lightning protection system lps, shielding wires, magnetic shields, and spd determine the lpzs.
To assist in the planning and design of lightning and surge protection systems. Shielding design is based on the bil cfo, surge impedance, lightning current probability distribution, and lightning strike propagation. Fundamentals of lightning protection systems cedengineering. In essence, structural lightning protection can no longer be considered in isolation, protection. This method of the art in the field of lightning protection is incorporated can be both used for a simple determination of the class of in a uniform and updated international european stand lps in accordance with iec 623053 en 623053 and to ard.
Lightning eliminators lightning protection by lightning. Design the lightning protection system step by step. Detailed information to determine zones of protection are found in lightning protection design standards. In order to design an effective lightning protection system with franklin rods or capturing meshes, the following. South african national standard protection against lightning physical. Electromagnetic effects harmonization working group task 2 lightning protection requirements. So, in reality, there are no electrical isolation methods which provide reliable protection against surge voltages.
Angle method according to this method the protection volume is given by a line which. 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. Materials used shall be resistant to corrosionmaterials used shall be resistant to corrosion aa coppercopper bb copper alloyscopper alloys cc aluminumaluminum i. Lpi is dedicated to ensuring that todays lightning protection systems provide the best possible quality in both materials and installation practices for maximum safety. It can serve as a useful guide to justify additional cost incurred by additioh. Whether it is a 911 psap or a cellular telephone antenna on top of a mountain, special protection methods are available to prevent lightning damage to equipment and associated working personnel.
Calculate whether lightning protection is required or not for following building. Journal of lightning research, volume 3, 2007, pages 19. Sans 623052iec 623052, protection against lightning part 2. Lightning protection system an overview sciencedirect.
Janakiraman, senior manager product development, obo bettermann india pvt ltd explains the design guidelines. In this paper, the lightning protection requirements of a typical residential building have been discussed and techniques have been provided to protect the building from both direct and indirect. A proper lightning protection system design is very important to ensure increased protection of a building against lightning and its effects. Design guidelines for shielding effectiveness, current carrying capability, and the enhancement of conductivity of composite materials. Earthing guide for surge protection 1 earthing for surge protection of electronic equipment 1. Pdf lightning protection guide 3rd updated edition.
Strike terminations for lightning protection systems. Safety from the human, dwelling, and equipment aspects. Like many other engineering systems, lightning protection is not necessarily a design preference, but the need for a lightning protection system is determined by the requirements of nfpa 70 and nfpa 780, a lightning risk assessment, and oftentimes the facilitys insurance carrier. Design methods electrogoemetric design methods egm attractive effect of the shielding device is a function of the amplitude of the current of the lightning stroke. Analogue converters, relays or opto modules are important. Calculate lightning protection for building structure. This ac does not address lightning zoning methods, lightning environment definition, or lightning test methods. A lightning protection systems only purpose is to ensure safety to a building and its occupants if lightning happens to hit it directly, a task accomplished by providing a good, safe path to ground for the lightning to follow. Amateur radio station grounding and lightning protection. Understanding direct lightning stroke shielding of substations understanding direct lightning stroke shielding of substations. Iec 623052 provides a lightning risk management procedure that provides a tolerable limit of risk, methods to calculate the actual risk, and then evaluates the protection methods required to reduce the actual risk to be equal or lower than the tolerable risk. Lightning strikes to flammable materials in offshore oil installations ooi can cause devastating accidents.
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