Lightning protection According to the practical experience and standard of lightning protection engineering at home and abroad, the lightning protection system of building should protect the whole system. The protection of the whole system consists of external lightning protection and internal lightning protection. External lightning protection includes a flash adapter, lead down line and grounding system. Internal lightning protection includes all additional measures to prevent the electrical and magnetic effects of lightning currents in the protected space. In addition to all the above, there is a lightning protection equipotential connection, which reduces the potential difference caused by small lightning current. According to the international lightning protection standards, protected space refers to the structural system protected by the lightning protection system. The primary task of lightning protection is to intercept the lightning by connecting the lightning system and discharge the lightning current to the earth system by drawing down the system. In a grounded system, the lightning current dissipates into the earth. In addition, resistive, capacitive, and inductive "coupled" disturbances must be reduced to harmless values in the protected space. In Germany, DIN VDE 0185 Parts 1 and 2, applicable to the design, construction, expansion and renovation of lightning protection systems, have been implemented since 1982. However, this VDE standard does not include detailed regulations on whether buildings must have lightning protection systems. Decisions can be made on the basis of the national Building Regulations of the German Federal Army, national and local regulations and codes, the articles and instructions of insurance companies, and decisions on lightning protection systems for the real estate of the German Federal Army can be made on the basis of their hazardous characteristics. If a structural system or a building is not required to have a lightning protection system under the national building Code, it is entirely up to the building Authority, the owner or the operator to decide on the basis of their necessity. If a decision is made to install a lightning protection system, it must be done in accordance with the corresponding standards or regulations. However, rules, standards or regulations that are accepted as engineering only specify the minimum requirements at the time of their entry into force. From time to time, developments in the engineering field and related recent scientific discoveries are written into new standards or regulations. Thus, the DIN VDE 0185 Parts 1 and 2 currently in force only reflect the level of engineering from about 20 years ago. Building equipment management systems and electronic data processing have undergone significant changes over the past 20 years. Therefore, building lightning protection systems designed and built at the engineering level of 20 years ago are not enough. The insurance company's damage statistics clearly confirm this fact. However, the most recent experience in lightning research and engineering practice is reflected in international lightning protection standards. In the standardization of lightning protection, IEC Technical Committee 81 (TC81) has the international authority, CENELEC's TC81X is authoritative in Europe (regional), and the German Electrotechnical Committee (DKE) K251 committee has the national authority. Current status and future tasks of IEC standardization work in this field. Through CENELEC, the IEC standard is converted to the European Standard (ES)(sometimes modified): for example, IEC 61024-1 is converted to ENV 61024-1. But CENELEC also has its own standards: EN 50164-1 to EN 50164-1, for example. •IEC 61024-1:190-03, "Lightning Protection of Buildings Part 1: General Principles", in force worldwide since March 1990. • Draft European Standard ENV 61024-1:1995-01, "Lightning protection of Buildings - Part 1: General Principles", effective January 1995. • The draft standard (translated into national languages) is on trial in European countries (approximately 3 years). For example, the draft standard is published in Germany as DIN V ENV 61024-1(VDE V 0185 Part 100)(with national appendix)(Lightning protection of buildings Part 1, General Principles). • Final consideration by CENELEC to become the binding standard EN 61024-1 for all European countries • In Germany, the standard is published as DIN EN 61024-1(VDE 0185 Part 100). In August 1996, the draft German standard DIN V ENV 61024-1(VDE V0185 Part 100) was published. The draft standard or DIN VDE 0185-1(VDE 0185 Part 1)1982-11 May be adopted during the transition period before the final standard is promulgated. ENV 61024-1 is built on the latest technology to ensure the safety of the structure. Therefore, on the one hand, for more effective protection, it is recommended to apply ENV61024-1, including the national appendix. On the other hand, begin to gather experience of the application of this European standard which will come into force shortly. Lightning protection measures for special systems will be considered in the standard after DIN VDE 0185-2(VDE0185 Part 2):1982-11. Until then, DIN VDE 0185-2(VDE 0185 Part 2):1982-11 has been in force. Special systems can be handled according to ENV 61024-1, but the additional requirements of DIN VDE0185-2(VDE 0185 Part 2):1982-11 must be taken into account. The lightning protection system designed and installed in accordance with draft ENV 61024-1 is designed to prevent damage to buildings. Inside the building, people are also protected from the risk of structural damage (e.g. fire). The protection of the building and the electrical and information engineering extension devices on the building cannot be ensured solely by the lightning protection equipotential connection measures of ENV61024-1. In particular, the protection of information technology equipment (communication technology, measurement and control, computer networks, etc.) requires special protection measures based on IEC 61312-1:195-02, "Lightning Electromagnetic Pulse Protection Part 1: General Principles", as low voltage is allowed. DIN VDE 0185-103(VDE 0185 Part 103), which corresponds to IEC 61312-1, has been in force since September 1997. The risk of damage caused by lightning strikes can be assessed using IEC61662; Standard 1995-04 "Risk Assessment of Damage caused by Lightning" with Amendment 1:1996-05 and Appendix C "Buildings containing Electronic Systems".

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Post time: Feb-25-2023