Regarding high voltage transmission, I have a vague question[Copy link]
Every time I take a car on the highway, I can see the high-voltage power transmission towers on both sides of the highway. The transmission lines on the towers are not of the same thickness. The line at the top of the tower is obviously thinner than the other lines. I wonder what this line is used for? After careful observation, this line does not seem to be connected, because other wires either have an arc when passing through the tower, or are directly hung on the porcelain gourd. But this line does not seem to have one (it is not very clear when sitting in the car). The second thing I don’t understand is that when the transmission line passes through the tower, there is something on the wires on both sides of the porcelain gourd (it looks like a flat thing) parallel to the wires. I don’t know what this is used for.
How far it is depends on how thick your wire is and how much current (power) flows through it. The resistivity of aluminum is 2.83 × 10-8, you can calculate it yourself
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Published on 2012-9-13 21:18
1. The thin wire on the top is the lightning protection lead. 2. The flat metal block is the cable clamp. The insulating porcelain bottle (or glass) must also bear the drooping tension of the transmission cable. 3. The safe distance between high voltage and the ground: 10KV is not less than 35CM; 220KV is not less than 2 meters; 550KV is not less than 5 meters. If the distance is lower than this, the air will be broken down. There will be multiple porcelain bottles connected at the turning point of the tower to ensure that the distance between the cable and the metal part of the tower is greater than the safe distance.
Originally posted by zcgzanne on 2010-3-15 20:00 1. The thin wire on the top is the lightning protection lead 2. The flat metal block is the cable clamp, and the insulating porcelain bottle (or glass) must also bear the drooping tension of the transmission cable 3. The safe distance between high voltage and the ground: 10KV is not less than 35CM; 220KV is not less than 2 meters; 550KV is not less than 5 meters. If the distance is lower than this, the air...
In addition to the distance between the phases of the high-voltage cable and the ground, if it is less than the specified value, they will be electrocuted, burning the cable and affecting the power supply equipment of the power plant and the power supply facilities at the lower end, because the parallel voltage between the phases is higher.
Hello, when you say "safe distance between high voltage and ground", is the high voltage line a bare wire or one with an insulating protective layer? (I am more concerned about 10KV) Also, what will be the impact of a 10KV high voltage line with an insulating protective layer being too close to a residential building? For example, 3-5 meters and 10 meters. (Can you do a quantitative analysis?)
If the power is transmitted over long distances, the voltage at the user is likely to be quite low. In addition, in order to ensure the energy transmitted, the current when using 380V transmission is very large, so very thick wires are required!
How far it is depends on how thick your wire is and how much current (power) flows through it. The resistivity of aluminum is 2.83 × 10-8, you can calculate it yourself
Details
Published on 2012-9-13 21:18
How far it is depends on how thick your wire is and how much current (power) flows through it. The resistivity of aluminum is 2.83 × 10-8, you can calculate it yourself
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