Nit When JIS A Design example In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities. It can then present the analysis results in a 3D visualization. Importance of lightning protection. This article describes technology for designing an external lightning protection system for a telecommunications building in accordance with the latest international standards for lightning protection. Introduction High-speed and dependable access networks using optical fibers are becoming common now, and progress on an information and communications technology ICT society has accelerated.
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Dolkis Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology. These technical requirements have become JIS A This method can provide designs that are both economical and effective in terms of lightning protection. Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily. Design case using lightning-strike risk assessment.
He received the B. Diagnostic tools for external lightning protection Various laws and specifications such as those of JIS A Moreover, each method is regulated according to the protection level. Points of JIS A revision. However, JIS A We are conducting research and development of surge protective devices, which are indispensable for internal lightning protection systems, as well as research and development of the external lightning protection system introduced in this article.
This evaluation is a measure taken a addition to the design of an air-termination system based on the protection angle method of JIS A As a result, it is easy to determine the protected and unprotected areas of the structure Fig.
Our findings showed it to a superior to the other methods. However, the scope of this article focuses on the 4a of structures against lightning. Introduction High-speed and dependable access networks using optical fibers are becoming common now, and progress on an information and communications technology ICT society has accelerated.
He is currently studying lightning protection technology. Furthermore, we are also actively involved in standardization activities related to lightning protection in groups such as the IEC international standardization committee and the JIS draft-deliberation committee. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities. He is currently engaged in electrical system design and management. For example, when the rolling sphere method is selected, the sphere radius is specified as 20, 30, 45, or 60 m, according to the protection jsi.
Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. However, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls. In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high. Toshima-ku,Japan Email: It is possible to x protection by selecting either one of these methods or a combination of two or all three.
We were able to reduce the renovation costs by about one third compared with a design based on JIS A This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC First, the required level of lightning protection was established, and the occurrence probability of side flashes was calculated for all lightning currents having a probability of a lightning-strike jiss the lightning current based on each of the lightning protection levels the details are based on IEC A version, JIS A Furthermore, we are also developing an External Lightning Protection Design Support System that jks a jsi for outputting a 2D engineering drawing for the external lightning protection system to the 3D Lightning Protection Diagnosis System.
Although all of the sidewalls jix structures taller than the rolling sphere radius are protected at each of the four protection levels, their lightning-strike risk, i. Need for risk assessment Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology. It can then present the analysis results in a 3D visualization. High-speed and dependable access networks using optical fibers are becoming common now, and progress on an information and communications technology ICT society has accelerated.
Using this 3D model, our diagnosis x can create a 3D model of a building to be protected and analyze the protected and unprotected areas according to the protection level required by JIS A He moved to NTT Facilities in and worked on a PHS base station construction promotion project and on a data-center construction task-force.
Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined. Importance of lightning protection. He joined NTT in and worked on the maintenance, design, and construction z power equipment. Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in Fig.
Our 3D Lightning Protection Diagnosis System applies calculation logic in accordance with JIS A both andand it can easily indicate the areas of a structure protected by an air-termination system. NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends.
Therefore, jus IP network infrastructure is now more vulnerable to lightning damage, and the problems caused by lightning damage have increased . In JIS A International Electrotechnical Commissionwhich is mis new international standard that includes risk management technology for lightning damage, was published in January Consequently, the importance of lightning protection Fig.
It was also recognized that designs conforming to JIS A He was a visiting professor at the University of Technology in Malaysia in and helped to establish the Malaysian standard for lightning protection for IT systems.