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Why overhead lines are far cheaper than underground cables for long distances and less economical for short distances?
First of all, the overhead lines are cheaper because they are bare, while underground cables are armoured and insulated, hence explaining the higher price. Overhead cables come of course with accessories like poles and insulators (mostly porcelain). For shorter distance, underground cables are preferred as the cost of pole erection does not exist.It's also worth pointing out that the cost of excavating a trench is more expensive than erecting an overhead line, and this cost escalates dramatically with higher voltage systems. For example, a 132-kV double-circuit underground line is between 5 and 8 times the cost of an overhead tower line, whereas an 11-kV single-circuit underground line is up to twice the cost of a wooden-pole overhead line.
Overhead cables are made of almunium not of copper explain?
Much of the newer overhead cables is made of aluminum with steel reinforcing it for strenght purposes. Aluminimum is much cheap, and much lighter, thus it is cheaper to use vs. copper for high voltage transmission, and copper has a lower resistance which means more electricity can get through the wire/ cable, which means more electricity can get around the world quicker. most people should use copper becasue it has a lower resistance where aluminuim has a bit of a high resistance not to much but a bit so that is why you use copper not alominuim.
Why do electric cables get hot?
cables get hot because they have too much current running through them. heating wires are made to run hot. cables are not. get larger wire
What is the cable size that are used in 11kv system?
It depends on the power rating of the circuit but a common size would be 95 sq. mm up to about twice that. 11 kV systems are usually 3-phase 3-wire. Underground cables use copper while overhead ones tend to use uninsulated aluminium or aluminium conductor steel reinforced (ACSR) cables.
Why are electrical cables set to sag?
because of heat cables expand
Why are wires hung loosely in summer?
beacuse is good
Advantages and disadvantages of underground and overhead cables?
Overhead transmission lines are less expensive, in most cases, significantly less expensive, than underground cables. Underground transmission cables require insulation, cooling systems, and -the most expensive feature- excavation!
What is the definition of suspension bridge?
A bridge with overhead cables to support it.
What is underground power transmission?
power cables under ground rather then overhead.
Why not touch overhead cables with branches?
Touching overhead cables with branches can be extremely dangerous because these cables often carry high voltage electricity. If a branch comes into contact with the wires, it can create a path for electrical current to travel, potentially causing electrocution or fires. Additionally, the added weight of branches can cause the cables to sag, increasing the risk of accidents. It's important to maintain a safe distance from overhead power lines to prevent these hazards.
Why are overhead electricity cables never tightly over a pylon?
Overhead electricity cables are not tightly strung over a pylon to account for factors like temperature changes, wind-induced movements, and maintenance needs. Having some slack in the cables helps to reduce stress on the wires and prevent damage or breakage.
Difference between overhead cables and under ground cables?
Overhead cables are installed above the ground on poles or towers and are generally easier to access for maintenance but more exposed to weather conditions, while underground cables are buried beneath the ground, offering better protection from environmental factors but requiring more complex and costly installation and repair processes. Vazpo sells a wide range of cables including overhead and underground cables.(www. vazpocable. com)
Why overhead electric cables made up of aluminium and not copper?
Overhead electric cables are typically made of aluminum rather than copper due to aluminum's lighter weight and lower cost, which makes it easier to install and supports longer spans between poles. Aluminum also has a higher resistance to corrosion, particularly when treated with protective coatings, enhancing its longevity in outdoor environments. While copper has better electrical conductivity, the advantages of aluminum in terms of weight and cost efficiency make it the preferred choice for overhead power lines.
Why overhead lines are far cheaper than underground cables for long distances and less economical for short distances?
First of all, the overhead lines are cheaper because they are bare, while underground cables are armoured and insulated, hence explaining the higher price. Overhead cables come of course with accessories like poles and insulators (mostly porcelain). For shorter distance, underground cables are preferred as the cost of pole erection does not exist.It's also worth pointing out that the cost of excavating a trench is more expensive than erecting an overhead line, and this cost escalates dramatically with higher voltage systems. For example, a 132-kV double-circuit underground line is between 5 and 8 times the cost of an overhead tower line, whereas an 11-kV single-circuit underground line is up to twice the cost of a wooden-pole overhead line.
What is the uses of overhead cables?
Overhead cables are primarily used for the transmission and distribution of electricity across long distances, facilitating power supply to homes and businesses. They can also support telecommunications lines, enabling data and voice communication. Additionally, overhead cables are often employed in transportation systems, such as tram and light rail networks, to provide power to vehicles. Their installation is generally more cost-effective than underground alternatives, especially in rural or challenging terrains.
What are transmission cables made of?
Transmission cables are made of conductors and insulating material covering that conductor.
What are pylons used for?
Pylons are structures used to support overhead power lines or telecommunication cables. They provide a stable and elevated platform for these utilities to be transmitted over long distances. Pylons are typically made of steel or concrete to withstand environmental factors and ensure the safety of the cables they support.
