Why can't I take an umbrella at the train station?

1. The high-speed train unit receives 27,500 volts of high-voltage alternating current from the catenary through the pantograph, and the safe distance of high-voltage electricity is two meters.

If passengers carry umbrellas, because rain columns and humid air are charged conductors in rainy days, passengers carrying pointed umbrellas can easily lead to current connection, thus causing some dangers.

2. Normal voltage has a radian. When the weather is clear, the "kill" radius of the power grid may be only 0.5 meters, even if passengers stand outside the white line, there will be no big problem.

However, when the weather is wet or rainy and snowy, high-voltage electricity may break through some raindrops, and the conductive range will be obviously increased. The radius of 0.5 meters will be extended to 1 meter or even 2 meters, so it is very dangerous to stand outside the safety line.

Extended data:

Precautions for high-speed railway station passengers in rainy days:

1. When traveling on the platform in rainy days, try not to bring a pointed umbrella, but a flat umbrella that is easy to fold. When the train arrives at the station, put away your umbrella and get on the bus.

2. There is a safety line on the railway station platform, and passengers waiting at the railway station platform should stand in the safety white line. When waiting for a bus on the platform, stand away from the edge of the platform and at least ensure the safe distance of 1 m yellow line. If you just want to avoid the rain, you can hide in a place with a rain gallery.

4. When the train enters the platform, the airflow speed between people and vehicles will accelerate. According to the relationship between fluid pressure and flow velocity, we can know that the speed of air flow in the safety line increases and the pressure decreases, and the speed of air flow outside people is slow and strong, while the speed of air flow inside people is fast and the pressure is small, which will produce an internal pressure difference and push people to the train, which is prone to danger.