It doesn't ring when it rains.

This kind of sound is actually the noise produced by corona discharge caused by air ionization near the power line. Because the air is humid in rainy days, the resistance is small compared with dry weather. When the high-voltage line discharges to the surrounding air, it will hiss, but it will not form an arc or spark. So, when you hear a hissing sound next to the high-voltage line, don't doubt that it is discharging. But it only happens in some places where wires have burrs or telephone poles are connected, and it will not break through the air and has no influence on people or things.

It's not only when it rains that there is sound. The high-voltage line ionizes the air to form a discharge, which makes a hissing sound. This phenomenon does not only appear in rainy days. Where did the sound come from? It's not that wires can talk, but this-at ordinary times, alternating current on high-voltage lines will produce alternating magnetic fields, and under the action of magnetic fields, wires will vibrate and make sounds. The frequency of sound is closely related to the frequency of alternating current. On sunny days, the sound will be smaller and easily covered by the background noise of the surrounding environment. When it rains, with the increase of air humidity, the air resistance decreases and the corona discharge increases, which will lead to the increase of discharge sound.

Discharge? Will I be in danger? In theory, wet weather will make insulation worse, and the safe distance between people and high-voltage lines needs to be larger than usual. But don't worry, the power supply company has left a safe distance when setting up the line. Under normal circumstances, there is no danger for people to pass under the wires. Of course, Bian Xiao suggested that you should try not to stand under high-voltage lines for a long time in rainy days.

Is it dangerous to answer the phone under the high-voltage line? We said: such worries are completely unnecessary! The state has clear regulations on the distance limit left when high-voltage lines are erected, which has a large margin compared with the safe distance. The mobile phone is only the size of a palm. People with mobile phones might as well put their hands closer to the wires. Therefore, electric shock by cell phone will not happen. As for the power of mobile phone electromagnetic waves, it is not worth mentioning. Generally speaking, the higher the frequency of electromagnetic waves, the stronger the ionization. The frequency of mobile phone radio waves is too low to ionize air at all.