What are the calculation methods for the protection range of the lightning rod? The electrician's home is here to sort out the various calculation methods commonly used for the protection of lightning rods. I hope to help everyone.
At present, the calculation formulas for the protection range of lightning rods in different countries in the world are different in form. Generally, there are several calculation methods as follows:
1. Polyline method: The protection range of a single lightning rod is a fold line cone.
2. Curve method: The protection range of a single lightning rod is a curve cone.
3. Straight line method: It is determined by using the tip of the lightning rod as the apex to determine the angle of the building. The building with explosion danger uses a 45° angle, and the general building adopts a 60° angle. The protection range is a straight cone.
Since 1983, China has officially formulated its own lightning protection specifications. At present, China's building lightning protection code GB50057-94 also adopts the rolling ball method recommended by the International Electrotechnical Commission (IEC) as the calculation method of the lightning protection range.
In the calculation method of the protection range of the lightning rod, the calculation method of the protection range of the commonly used lightning rod (here only refers to the single needle) mainly includes the folding line method and the rolling ball method. For this reason, the calculation of the "folding method" and the "rolling ball method" has been carried out. Preliminary analysis and discussion, it is concluded that the main feature of the "Folding Line Method" is that the design is intuitive, the calculation is simple, and the investment is saved. However, the height of the building is more than 20m. The main feature of the "rolling ball method" is that the lightning rod can be calculated. The scope of protection when combined with the grid, but the calculation is relatively complicated and the investment cost is relatively large.
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