Will high-voltage cables leak electricity when it rains? What is the reason?

February 26, 2024

The answer is: no electricity leakage. Then some people will ask: Some high-voltage cables are covered with wires, and some are bare cables, and the iron frames of high-voltage lines are all made of metal. On rainy days, the rain will wet all the insulated parts from the high-voltage lines to the brackets. Why is there no leakage? ? What is the reason? Wire and cable manufacturers tell you:

1. In the application of insulator strings, the insulator design takes into account rainy days. The insulator is like an inverted bowl, with water on one side and no water on the bottom. Inside the bowl, there are circles of wrinkles to increase the creepage distance of the insulator. Even with tensile strings, the insulator insulation will not fail due to rain.

2. Take a closer look at the porcelain bottle. The upward side is bright and the downward side is wavy. This is to increase the creepage distance. When it rains, the downward side of the porcelain bottle is dry, and the space between the upper layer and the lower layer is also dry. Of course, there will be no leakage of electricity.

3. Air is a good insulator, and it is not easy to conduct electricity even on rainy days. Generally, the conductor closer to the high-voltage line is the earth. If the high-voltage line wants to leak electricity, it must break through the air to leak electricity to the earth. However, because high-voltage lines are built very high, they cannot penetrate the air even on rainy days.

4. The wires and poles are connected by insulated pillar porcelain bottles, lightning arresters or suspensions. Considering the problem of rain or dust pollution, these three have umbrella skirts, so the insulation performance can be ensured even when it rains. , to avoid leakage caused by electricity creeping along the rainwater.