Shenzhen Evening News: Since the end of March, Guangdong has been hit by thunderstorms several times. Many people are extremely frightened at the mention of thunder. Online, many "lightning protection tips" have emerged, teaching people to avoid using household appliances and make sure to cut off the power supply during thunderstorms. Is this move really necessary? Must household appliances take a "vacation for recuperation" during thunderstorms?
Technical experts from Guangdong Power Grid stated that with the lightning protection devices of buildings "guarding", lightning will not invade through power lines, and electronic products can fully "hold out" on their own. The vast majority of lightning strikes occur in high-voltage transmission systems and medium-voltage distribution lines. The power system has a strong "line of defense" against these lightning strikes. Lightning protection devices such as lightning wires, lightning rods, and lightning arresters will make the "thunder God" take a detour. In addition, most residential communities are equipped with voltage clamping facilities in accordance with the lightning protection design code for buildings. These facilities can effectively absorb the sudden huge energy in low-voltage systems, limiting the instantaneous "overvoltage" (i.e., exceeding the working voltage) that "surges" into power lines and signal transmission lines within the voltage range that the system can withstand, and protecting user equipment.
The wireless network we commonly use is essentially a kind of radio wave transmitted in the air, just like there are many invisible straight lines in the air. At the moment of a lightning strike, a large amount of electric charge rushes into the air instantly, causing changes in the spatial electromagnetic field of the wireless network. Therefore, intense lightning activities have a certain impact on public coverage wireless network signals, but have little effect on household wireless network signals with a smaller coverage area.