The rolling sphere method is included in national fire protection association document nfpa 780 standard for the installation of lightning protection systems. Where the rolling sphere method is to be used to evaluate the protection provided by mesh conductors or network of catenary wires, the mesh must be mounted at some distance above the roof see fig. Learn more on lightning protection design bs en 62305. Lightning protection rolling sphere 3d mast and static youtube. Designing a lightning protection system using the rolling sphere method. Lightning protection design using rolling sphere method. The electrogeometric method egm based rolling sphere method rsm is used to develop first part of the program. Designers use the rolling sphere method to help determine where air terminals or strike termination devices are required on a building. The calculation method primtech supports lightning calculations according to the din vde 0101 standard as well as the rolling sphere method derived from iec 623051 standard. These methods are described in the pertinent ieee 1 and iec 2 standards and include. However, it suffers from the fact that there has yet to be a firstprinciples derivation for its effects from the basic physics involved in lightning attachment.
The standard that we recommend most is the rolling sphere method rsm based on ieee998. Evaluation of rolling sphere method using leader potential. Nov 24, 2017 the rolling sphere method of protection is the preferable method because it can be applied to all types of structures with even the most complicated geographical arrangement. Study of lightning safety distance using rolling sphere method. Designing a lightning protection system using the rolling. Learn how to perform the lightning risk assessment and how to interpret the resultss.
The rolling sphere method enables designers to determine where air terminals or strike termination devices are required on a building. The rolling sphere method rsm the rolling sphere method is recommended as the most universal and most effective method. Sls utilizes custom software tools to efficiently perform the risk assessments outlined in nfpa780 and iec62305. Application software for the optimal design of shielding against direct lightning.
Many facilities require a more refined, precise quantification of their lightning risk due to either the value or criticality of the assets. Rolling sphere method of lightning protection and shielding for a. The radium of the sphere depends of the standard that have been. Sparkta makes it possible to reduce the final cost of the lightning protection system compared to the designs made by using the rolling sphere method. The rolling sphere size shall be 24 m unless otherwise specified in the design standard c 1. Consumer software has a lot of intelligence builtin to it for a specific. The main hypothesis of the method is based on the idea that the lightning strikes the nearest object on the earth situated at the socalled orientation distance from the descending leaders head.
The rolling sphere lightning protection method assumes the electricallycharged field that produces a lightning strike has a 150 ft. Lightning protection rolling sphere 3d mast and static. The rolling sphere method accounts for all types and combinations of structures in a more elegant and technically secure way. How to easily do the rolling sphere method in solidworks. This concept has led to the given rolling sphere scheme for simplified electrogeometric model 5. If masts and shield wires were installed as per the original design, the probability of a strike reaching the equipment or bus is. In the rolling sphere method, all 4 protection classes can be calculated also using.
The sphere rolls up and over and is supported by lightning masts, shield wires, substation fences and other grounded metallic objects that can provide shielding from lightning. Although the previous section pointed out the limits of the application of the rolling sphere method, this is the best procedure available for the construction of the air termination system. Ieee std 9981996, ieee guide for direct lightning stroke. Learn to apply the rolling sphere method as well as the protective angle method. Rolling sphere concept on structures over 20 m tall. This is achieved by rolling the sphere up against a finial and scribing a line red whereby the area of protection green equals the unprotected area magenta. This paper discusses the lightning protection of a property using the rolling sphere method. In contrast, this sphere cannot be used as basis to perform theoretical studies or to get scientific conclusions. Class i 20 m class ii 30 m class iii 45 m class iv 60 m. How to use rolling sphere method in lightning protection. The sphere rolls up and over and is supported by lightning masts, shield wires, substation fences, and other grounded metallic objects that can provide lightning shielding.
Cad system for lightning protection crazyengineers. The only software that i could find in any of those links was information on lightning. Design calculations of lightning protection systems part. This calculator shows the low point of the rolling sphere between the two structures. Mar 03, 2015 training on the rolling sphere method of lightning protection and shielding for substations using ieee std. Creating lightning protection based on rolling sphere in ddscad. Designing a lightning protection system using the rolling sphere method abstract. The rolling sphere method of protection is the preferable method because it can be applied to all types of structures with even the most complicated geographical arrangement. Thus, one can imagine one sphere which is moving towards the ground and which has.
Rolling sphere method calculation for lightning protection duration. The rolling sphere method uses an imaginary sphere of a defined radius over the surface of a building or substation. Lightning zoning for aircraft ema3d software and consulting. Rolling sphere method of lightning protection and shielding for a building rolling sphere method of lightning protection and shielding for a building. Rolling sphere method compared for safe lightning protection. Assuming the electricallycharged field produces a lightning strike with a 150 ft. A piece of equipment is said to be protected from a. Select the lightning protection tool in the 3d design ribbon. In addition, it introduces an easy approach on how to design an effective lightning. How does one choose the lightning protection class for.
Horvath, construction of the protected volume with proper application of rolling sphere method. Select the radius of the sphere that you want to use from the drop down list. Ieee guide for direct lightning stroke shielding of substations 1. The designer visualizes a sphere with that radius rolling over the surface of the building. The rolling sphere method rsm is based on electrogeometric model egm which is one of the techniques used to determine the lightning safety distance. Lightning protection air termination system design. In the field of electrical protection there is a method of electrical protection of buildings against atmospheric discharges lightning protection called the electrogeometric method or the rolling sphere method. In the rolling sphere method, all 4 protection classes can be calculated also using spheres of various radii. Lightning protection calculation lightning protection.
Optimal support in the engineering due to the rapid calculation of the 3d protection volumes which is spanned by the lightning protection facility primtech ideally supports the engineering process for high voltage switchgear. Knowing software method for performing the risk assessment study. Using this method, one rolls an imaginary sphere of a certain radius over a building or other structure so as to ascertain where to place air terminals read. Rolling sphere method of lightning protection and shielding.
The concept applied for this method does not implied safety for people since touch voltages may affect them. Please provide if there are specific software for 3d modeling using images and rolling sphere method. Rolling sphere method simulation cr4 discussion thread. Rolling sphere method of lightning protection and shielding software request originally posted by. Unlike other programs, mine can calculate static mast and static lines, and it includes the fence, really any configuration. The placement of lightning rods can be optically checked by using the rolling sphere method. The process of the analysis of the protection system could be observed in 3d and in real time especially in case of usage of the rolling sphere method using similar software libraries like in 3d. Lightning protection systems design part i electrical. I simply want a software that will simulate a rolling sphere through an environment with obstacles that when it comes in contact with an object it will roll up and over, and leave a distinct path behind it showing where it hashas not touched in 3d. Rolling sphere method lightning protection design in florida. Choose the radius of the rolling sphere used in determining the zone of protection. The rolling sphere analysis method is selected by default which is what we will use for this example. The aim of the program is to design the protection system. A shielding failure analysis option is also available to determine the rate of shielding failure based on lightning data statistics specified by the user.
Lightning is a natural occurring phenomenon that can cause damage harm and fatality. In addition, it introduces an easy approach on how to design an effective lightning protection and finally it provides a case study. The designer shall undertake a lightning design using the rolling sphere method or alternative approved method. It uses a statistical based simulation model to assess vulnerability of an installation and performance of the. Bs eniec 62305 lightning protection general standard. Join the grabcad community today to gain access and download. Rolling sphere method of lightning protection and shielding software request. Rolling sphere method the rolling sphere method is based on an electrogeometrical model, where it is assumed that the downward leader that will strike the structure to be protected has the shape of a sphere with a radius d space where the last step of the downward leader can stay. Learn the components of the internal air termination system. Designing and analysis of lightning protection systems of buildings according to new method rolling sphere described in new norms iec 62. The rolling sphere concept a sphere of radius equal to the striking distant is usually employed to visualize the likely stroke termination point, the socalled rolling sphere method rsm. The use of 3d modelling to determine the zones of protection over the structure gives clear visualisation of the air termination system and how the lightning protection.
This calculator determines if an object between two structures, which contain an lp system, is within the zone of protection created by the two structures. Given a series of points all above the zaxis, how can i easily create a surface from rolling a ball over the points. Software for rolling sphere method of lightning protection. How to use rolling sphere method in lightning protection for. Training on the rolling sphere method of lightning protection and shielding for substations using ieee std. It is a method based in a theoretical approximation and as there is been said, the lightning in most cases wont behave as it is predicted to. The rolling sphere method has a long historical heritage for terrestrial installations. Bs eniec 62305 lightning protection general standard principles. A brief piece giving answers to what is the rolling sphere method of. A graphically simulated rolling sphere is used to identify potential points of contact of the sphere and building model, allowing you to optimize the lightning protection system. Rolling sphere method of lightning protection and shielding for a building.
I created a 3d rolling sphere lightning protection program. An example of using the rolling sphere method can reduce the failure rate to. Rolling sphere method use an imaginary sphere of radius s over the surface of a substation. The standard is based upon rigorous scientific research, testing with real lightning, and more than two hundred years of proven performance. Rolling sphere method for lightning protection ecle. The sphere rolls up and over and is supported by lightning masts, shield wires, substation fences and other grounded metallic. Application of rsm involves rolling an imaginary sphere of a prescribed radius over the air termination network. Whereas, the protection angle method is only suitable for the most basic of structuresgeometries, and where the object dimensions do not exceed its comparative rolling sphere radius dimension. The protection zone of lps is defined as the volume of space where the air termination provides protection against a direct lightning strike by attracting the strike to it.
Electrogeometric model commonly implemented as the rolling sphere method. The rolling sphere method generally provides the most optimized design and the vertical airterminal is far more effective at capturing lightning flashes than mesh conductors installed upon, or just above structure surface. The striking distance is the total distance of the lightning strikes to the rod. Other methods, such as the protection angle method pam, the improved electrogeometric method iem, the standard collection volume method cvms, and the mesh method mm are often considered during the design phase. Learn the various sources and types of damages and types of losses as well as the related risks. Rolling sphere method lightning protection in michigan. The grabcad library offers millions of free cad designs, cad files, and 3d models.
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