Sét là hiện tượng tự nhiên phổ biến, xuất hiện do sự hình thành các điện tích trái dấu của các đám mây mang cực âm – dương. Trong quá trình tích lũy điện tích trước khi sét đánh, một điện trường có cường độ gia tăng liên tục được hình thành. Khi điện thế tại một nơi nào đó trong đám mây vượt quá ngưỡng cách điện của không khí, thì xảy ra hiện tượng sét đánh thẳng vào không khí hoặc đánh xuống mặt đất.
Lightning not only has the potential to cause human casualties, but also destroys property, buildings, energy supply facilities, aviation operations, electrical and electronic equipment, and radio stations. television, communication systems, etc.
Lightning can strike the building directly; it can also penetrate equipment through antennas, floating lines, cables connecting equipment, power supply circuits for telecommunications equipment, etc., damaging many objects. electronic devices that endanger human life.
To effectively prevent lightning, it is necessary to follow these 3 steps:
1. Protection against direct lightning strikes or direct lightning strikes on the construction,
2. Lightning protection via power and data cables
3. The grounding system has a low impedance and high safety.
For direct lightning protection, it is necessary to use lightning protection devices to form a frame that covers the outside of the area to be protected, such as lightning rods, lightning rods, etc., to cut lightning for the source and signal lines, to prevent lightning Lightning strikes electrical equipment and telecommunications equipment through signal cables.
When it rains and thunderstorms, lightning occurs, besides directly causing material losses by being struck by lightning, lightning also indirectly destroys other objects where lightning does not occur by way of the transmission path of signal lines, electrical wires, metal wires, etc., making other items also paralyzed, unable to function.
A good lightning protection solution will help protect the safety of people and electrical, electronic, and IT equipment when there is a direct lightning strike and a surge or induced lightning current. With a small, compact size that does not take up much space and does not lose its beauty, the lightning protection system of Global Electrical Technology Corporation provides the highest possible safety in all weather conditions, meeting the best efficiency for users.
