0
Advantages and disadvantages of underground and overhead cables?
Wiki User
∙ 13y ago
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!
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoUnderground is safe from weather. Overhead is cheap.
Add your answer:
Earn +20 pts
What is underground power transmission?
power cables under ground rather then overhead.
What are the advantages of Murray loop test compared to Varley loop test?
Murry for long underground cables test but varley usually for short distance.
What is expected life span of high voltage underground cables?
10yrs
How do you design an 11kv underground cable?
It is not necessary to design an 11 kv underground cable. There are several 11 kv underground cables already on the market. You can choose exactly which cable will fit best for your project and purchase it.
How capacitance effects are taken into account in transmission lines?
Natural capacitance exists between conductors at different potentials, including between those conductors and earth (ground). The value of such capacitance is significantly higher with underground cables than with overhead lines, due to the close proximity of the individual conductors in an underground cable. Capacitance results in line losses in both a.c. overhead and underground systems, due to the corresponding capacitive reactance (opposition to a.c.). In the case of long, high-voltage, underground or under-sea cables, the capacitance losses can be so high that d.c. transmission is used instead of a.c. (d.c. eliminates capacitive line losses). In addition to the line losses, the electric fields resulting from the capacitance can lead to insulation breakdown -making it essential that 'sharp corners', etc., are avoided in their design and construction. One of the reasons that high-voltage overhead conductors are 'bundled' (i.e. more than one conductor per line) is to reduce the stress on individual line conductors that would otherwise occur due to their relatively small diameters.
What is underground power transmission?
power cables under ground rather then overhead.
What are the advantages and disadvantages of underground transmission cables?
The main advantages are that they don't spoil the appearance of the countryside and can't damage flying birds, and that they are protected from the weather. The main disadvantage is the much larger cost of installing them.
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.
Disadvantages and advantages of submarine cables?
A. you can go under water. D. if they break you die.
What are the advantages and disadvantages of wired connections?
Advantage: everything. Disadvantage: cables and less mobility.
How does electricity travels to your homes?
by power lines comuters fridgeyourater cell phone battery
Why are the cables of the national grid are above the ground and not buried underground?
undergroud cables would be: -much more expensive -much more difficult to repair -difficult to bury where they cross canals, rivers and roads. also, overhead cables are high above the ground, underground cables could affect people more because the cales wouldn't be very deep
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.
What are the advantages and disadvantages of National Corporation?
Advantages: Pollution can be kept away from cities and large power stations can be built (more efficient Power can be diverted to where it is needed, if there is high demand or a breakdown Surplus power can be used to pump water up into reservoirs to be used to generate hydroelectric power when there is a peak in demand. Disadvantages: Power is wasted heating the cables Overhead power cables are an eyesore Smaller generating projects such as wind turbines and panels of solar cells have difficulty competing with large suppliers
What are Overhead power cables advantages and disadvantages?
Advantages=The main advantage is that they are easier to repair if damaged (Usually just go up a ladder and do the necessary work)They are not restricted by the landscape that they are in e.g. you can easily suspend them over a motorway or riverAlso they have a less chance of electrocuting people as they are so high upLose less energy then if they were underground as they do not have any good conductors near them to transfer energy away as easilyCheaper to set up and maintain than if theyw ere underground Disadvantages=Main problem is that they visually pollute the areas they are set up inSuffer from problems like vandalism, assisting terrorism (Easy access), and lightning strikesBirds and low flying aircrafts can sometimes fly into them
What are overhead cables made of?
they are made of alluminium
What are the advantages of Murray loop test compared to Varley loop test?
Murry for long underground cables test but varley usually for short distance.
