The right lightning rod for your home

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- The lightning collector is one of the important parts of the direct lightning protection system. Direct lightning protection systems often include: lightning rods, lightning conductors and grounding systems.

- A lightning rod, also known as a lightning rod, is a metal bar mounted on the top of a building, with the function of collecting lightning when lightning strikes the building and transmits to the ground through wires, instead of traveling. through the building, where it could start a fire or cause electric shock. The lightning collector combined with the lightning rod and grounding system forms a direct lightning protection system, an important system for all projects.

- However, up to now, the installation of lightning protection systems has not been paid attention to in construction projects because the installation is quite complicated and the equipment is quite bulky. Grasping the needs and development trends, following the progress of science and technology, scientists have researched a more active lightning rod that can actively catch lightning and prevent it from hitting objects. or works that need protection. These types operate using many different working principles but can generally be divided into two main types:

- Charge-dispersing lightning rods: have the property of creating a layer of positively charged space charges in the atmospheric region above the tip of the needle. The stronger the thundercloud's electrostatic field, the stronger the discharge current and the larger the space charge layer, which acts as an electrostatic shield, weakening the electric field between the thundercloud and the ground, eliminating the risk of discharge. of lightning. However, this method is not yet recognized worldwide and has not been included in current lightning protection standards. In addition, determining the protective radius of the lightning rod is difficult, in addition, the grounding system of this type must be very extensive.

- Premature discharge/controlled early discharge lightning arrester: When operating, the lightning arrester actively emits upward leader rays to capture downward lightning leader rays, this allows to create a gain in protection distance DL and thus increase the protection radius width compared to the Franklin needle method.

Operating principle of lightning rod (ESE technology):

The faster the ascending current (upward leader) from the lightning rod to the cloud, the faster it will meet the downward leader and the chance these two rays will come into contact with each other before other currents shoot up from the top. First determine the point of impact of lightning on the ground. A leader lightning arrester is designed to create optimal conditions for the formation of this upward current.

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An electric field on the ground is created when lightning strikes, and this electric field increases rapidly as the lightning approaches. When lightning reaches a certain level (from 50 to 100 kv/m), the corona effect will appear, this effect is naturally formed on the roof of the building allowing for electric discharge (also known as fairy rays). ascending path) shoots up towards the cloud. The position of the ionization line that allows the lightning current to pass is determined as the position where the upward leader contacts the first downward leader from the cloud. The faster the ascending current (upward leader) from the lightning rod to the cloud, the faster it will meet the downward leader and the chance these two rays will come into contact with each other before other currents shoot up from the top. First determine the point of impact of lightning on the ground. A leader lightning arrester is designed to create optimal conditions for the formation of this upward current.

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