What is lightning? What is the threat from lightning? What damage does lightning cause?

10/01/2023

Lightning is an electrical discharge with a strong intensity ✅ can discharge currents up to 20,000 degrees C ✅ The temperature of lightning can be 3 times the temperature of the sun

What is Lightning?

Lightning is an electrical discharge between clouds and the ground. During a storm, the positive charges get collected on the structures under the storm cloud. While the negative charges in the cloud base descend to the ground in the form of charged streamers, the positively charged upward streamers emit from the structures to the cloud.

Sét là gì?Hoạt động của sét như thế nào?Mối đe dọa từ sét

One of the positive upward streamers meets with one of the negative streamers of the storm cloud and develops a conductive channel between the cloud and the structure on the ground. All current inside the cloud flows through this channel and the structure body and reaches to the ground. This conductive channel is called “Lightning”.

Lightning Threat?

Lightning current aims to reach ground through the fastest and shortest way possible. During this process, temperature goes over 20.000 °C which is three times the temperature of the surface of the sun. This is more than enough to create a critical damage on anything on the current’s path to the ground.

Besides the rapid rise in temperature, a sudden peak in the pressure causes explosive results and structural damages. Lightning is also an extremely dangerous threat to life on earth and creates a huge risk for people.

Sét là gì?Mối đe dọa từ sét ra sao?NHững thiệt hại gì do sét gây ra?

Structural damages caused by lightning

Sét là gì?Mối đe dọa từ sét ra sao?NHững thiệt hại gì do sét gây ra?

Lightning damages on electronics

Industrial Damage Distribution

Lightning usually strikes on the highest and sharpest point in a region. With an industrial point of view, Telecommunication and Radio-TV towers are the structures with the highest lightning strike rate as they are made of conductive material and are the highest and sharpest objects around.

What is lightning? What is the threat from lightning? What damage does lightning cause?

When lightning strikes on a tower, lightning current flows through the tower body to reach the ground by putting all antennas, radios, dishes, etc. out of service. Lightning current can also penetrate the shelter near the tower and damage all electronic devices inside, which are basically the most valuable units for the site.

What is lightning? What is the threat from lightning? What damage does lightning cause?

In the use of lightning attracting devices such as Early Streamer Emitters or ordinary lightning rods, the arrester tries to catch the lightning and transfer the current to the ground. However, lightning current follows the same path once again and it still damages the devices on the tower body and inside the shelter.

What is lightning? What is the threat from lightning? What damage does lightning cause?

What is lightning? What is the threat from lightning? What damage does lightning cause?

What is lightning? What is the threat from lightning? What damage does lightning cause?

As a result, there is no difference between protecting a high and metal structure like a telecommunication tower with a lightning arrester and leaving the structure unprotected.

 

 

 

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