The principle of the Faraday cage is based on the action of an electrostatic field, which generates an equal and opposite charge with the same size on the surface of the metal body, and can lead the charge away from the surface.
Applications of Faraday Cage:
1. Protective clothing for high-voltage live work
Protective clothing for high-voltage live work is made of metal wire. When it comes into contact with high-voltage lines, An equal potential is formed, so that no current passes through the worker's body, which plays a very good protective role and can be called an "iron shirt".
2. Cars
After a car driving in a thunderstorm was unfortunately struck by lightning, it was still able to continue driving safely. The reason is that the car body is made of metal, which is similar to a "Faraday cage" and forms an equipotential connection. The current passes through the car body and rainwater drains into the ground. The driver and passengers inside the car body will not be affected by lightning strikes.
The famous car program "Top Gear" once conducted an experiment on a car struck by lightning: it used 600,000 volts of high-voltage electric shock to the car. The experiment showed that after the high-voltage electric shock, only the indicator light on the dashboard of the vehicle was affected. All other instruments were normal, the car body was not damaged at all, and the host sitting in the car was unharmed. It can be said to be a "golden bell" for lightning protection.
Junhe Electronics reminds you that for safety reasons, it is best not to drive out during thunderstorms. If you encounter a thunderstorm while driving, park your car in a safe location on the roadside, away from big trees and billboards, turn off the engine, radio, doors and windows, etc., and avoid touching the steering wheel, door handles, and shift levers. Wait, keep your hands on your thighs, and wait for the thunderstorm to pass before continuing to drive.
3. Aircraft
According to statistics, an aircraft will suffer a lightning strike every hundreds of thousands of kilometers, but it will not bring catastrophic consequences. This is because the aircraft shell is made of metal, which has a "Faraday cage" effect and has a good shielding effect against lightning strikes. When the aircraft is struck by lightning, the personnel and equipment inside are relatively safe.
4. Buildings (structures)
Tall buildings (structures) are prone to lightning strikes. According to lightning protection technical specifications, a cage-type lightning protection net is established using the principle of a Faraday cage. , can effectively reduce the risk of lightning strikes and ensure the safety of people and property.
A typical representative is the National Bird's Nest Stadium. The steel components in its main steel structure and the steel bars in the reinforced concrete are effectively connected through welding to form a huge lightning protection network-air terminal device, which can quickly absorb lightning. The leakage is put into the ground, thereby ensuring the safety of internal equipment and spectators.