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What does a hammer do on overhead lines?

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What does a hammer do on overhead lines?

作者: Release Date: 2018-07-21 Author: Click:

Do n’t think that thin wires are not affected by wind. In reality, the wires between two poles are 10 meters to 100 meters, especially hundreds of meters. The wind of the whole section is not small.

Overhead lines


For example, a wire with a radius of 6 millimeters and a length of 100 meters is subjected to a wind force of 2 kg at a wind speed of 1 second / 18 meters (equivalent to a level 8 wind), and a wind speed of 30 meters / second (equivalent to a level 11 wind). Wind of 67 kg. "Elevated jacks", electric poles can support the gravity of downward force, but the wind is a degree of force, it is easy to push the pole down.


In addition, although it is usually the Japanese style, you can't see the small Japanese style, but it has an invisible damage to the electrical circuit. You need to know that just the zephyr that crosses the wire forms a small vortex in front of the wire. The composition and disappearance of whirlpools alternate quickly, reaching dozens of times per second. The upward and downward components of the vortex cause the wires to tremble.


This kind of tremor can reach thousands of hours a year. Although the vibration is not great, it will loosen the wires at the binding place of the electric pole, and may cause twisting at the clamp, which will cause metal fatigue. Broken shares. In this situation, if you encounter the breeze wind and the heavy load of rain and snow freezing, you will be smashed in one hit and the wire will be cut off.


In order to avoid and aggravate the vibration of the electric wires that are usually affected by the wind, the high-voltage power lines are equipped with shock-proof hammers not far from the two sides of the poles. You can see that there are two grenades connected with a wooden handle on the high-voltage lines.


The anti-vibration hammer is designed to increase the vibration of the wire due to wind. The high-voltage overhead line has a high pole position and a large gear distance. When the wire is subjected to wind, vibration will occur. When the wire vibrates, the task conditions at the wire suspension are extremely unfavorable. Due to repeated vibrations, the wires will be fatigued and damaged due to periodic bending. When the overhead line distance is greater than 120 meters, the anti-vibration hammer is generally used to prevent vibration.


On high-voltage overhead lines, a small hammer is often hung on the wires close to both sides of the insulator. This kind of hammer is called an anti-vibration hammer, and is designed to increase the vibration of the wire due to wind. The high-voltage overhead line has a high pole position and a large gear distance. When the wire is subjected to wind, vibration will occur. When the wire vibrates, the task conditions at the wire suspension are extremely unfavorable. Due to repeated vibrations, the wires will be fatigued and damaged due to periodic bending. When the span of the overhead line is greater than 120 meters, the anti-vibration hammer is generally used to prevent shock. For steel-cored aluminum wires, the anti-vibration hammer component is


w = 0.4d-2.2 (kg)

Where d——outer wire diameter (mm)


The anti-vibration hammer is composed of a heavy weight of a certain weight, a high-strength, high-strength zinc steel strand and a clamp.

URL of this article: http://pdaavenue.com/足球彩票/363.html

Keywords: overhead line

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