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RedX
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Why do 400 kv power lines have 6 pairs of wires, 3 on each side? Shouldn't there only need to be 4 wires, a ground/neutral wire and 3 wires for 3 phases?
jambaugh said:Three phase doesn't need a ground/neutral for power transmission Hence they will come in multiples of 3. Sometimes one or two ground lines are used as lightning protection where there are long spans.
There are various configurations, from three wires up depending on needs. Multiple circuits give both redundancy and higher power carrying capacity.
I would speculate that they may also be configured to reduce the small but nonzero radiative losses.
No. The two pairs would share the load, and each would have less current. That equals less resistive loss.RedX said:Redundancy makes sense, but I'm not sure about power carrying capacity. If more power is needed, then the turbines in the generator just push harder, and more power goes down through the line. I'm not sure why you need multiple lines for that.
Also if you have twice as many lines don't you get twice the losses?
The direct link doesn't work but I cut and pasted the link and did find the pic.RedX said:Here's a link to a picture of a 400 kV pole:
http://www.emfs.info/Sources+of+EMFs/Overhead+power+lines/Parts+of+a+power+line.htm
Call the 3 phases A, B, and C. Are the phases transmitted in pairs, AB, BC, and AC? Because in the pictures of the power lines I've seen, they are sent in pairs with spacers preventing them from touching. But why pair them at all? Why not just have 3 wires of A, B, and C?
The 6 pairs of wires in 400KV power lines are used to transmit electricity over long distances. The pairs of wires are arranged in a specific way to reduce power loss and maintain the stability of the power grid. Each pair of wires carries a different phase of electricity, which helps to balance the load and improve efficiency.
The 6 pairs of wires are arranged in a specific configuration known as a "bundle". This means that the wires are tightly packed together and arranged in a hexagonal shape. This bundle configuration helps to reduce the amount of space needed for the power lines and also minimizes the effects of electric and magnetic fields on the surrounding environment.
400KV (kilovolts) is a high voltage level used in power lines for long distance transmission. This high voltage helps to reduce power loss during transmission, making the power grid more efficient. It also allows for more power to be transmitted over longer distances without the need for additional power stations.
While 400KV power lines are generally safe, there are some risks associated with them. The high voltage can be dangerous to humans and animals if they come into contact with the wires. There is also a risk of damage to the power lines from extreme weather conditions or other external factors. However, these risks are minimized through proper maintenance and safety protocols.
The 6 pairs of wires in 400KV power lines play a crucial role in the overall functioning of the power grid. They help to transmit large amounts of electricity over long distances, maintain the stability of the power grid, and balance the load between different phases of electricity. This allows for reliable and efficient distribution of electricity to homes and businesses.