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What are overhead cables made of?
they are made of alluminium
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.
Are component video cables made of gold?
Compoent video cables themselves aren't made of gold, but they can be gold plated. Gold plated connectors allow for better conductivity. The cables are typically made of oxygen free copper.
Why are ceramic discs used to support overhead electrical cables?
Ceramic is an insulator. So it provides safety
What are VGA cables primarily used for?
VGA cables are cables which are used with computer electronics. The cables are primarily used to connect the monitor to the computer. Some of these cables are made for specific monitors or devices.
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.
Difference between overhead cables and under ground cables?
The principle difference between underground and overhead cable is thermal dissipation. With overhead cable, heat can dissipate into the air, and wind can improve the rate of thermal dissipation. On the other hand, overhead cable is exposed to solar gain that will result in some heating. With underground cable, heat dissipation is governed by the thermal conductivity of the soil. The Neher-McGrath formulas can be used to calculate thermal conductivity and the required derating of conductors. Comparing the two, an overhead cable generally has a higher thermal ampacity than an underground cable of the same material, dimensions and insulation.
Why is lead used in high voltage cables?
Steel-reinforced aluminium cables are used for overhead lines because aluminium is much lighter than a copper conductor, despite not being quite as good a conductor as copper. The function of the steel reinforcement is to improve the tensile strength of the conductor.
What are the applications of AB CABLE?
What are the applications of AB CABLE? Ans- Aerial Bunched Cable(ABC) are the cables used for overhead electrical power distribution in power lines. AB cables are used in an electrical transmission system or telecommunications line.There are so many AB CABLE manufacturers in India working in this space. There are different uses of AB CABLE. Some of them are as follows- AB CABLE is easy for installation. They are cost effective and economic. These cables are ideal for overhead connections since they can withstand high voltages. it can be installed with a narrow space. It also helps to reduce the chances of short circuit & mishappening.
