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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.
Is wood a conductor or an insulator of electricity?
Wood is an insulator.
Is polyvinyl chloride an insulator of electricity?
yes, its an insulator. its a type of insulator used for wires, cables, etc
How do you deal safely with a wire dangling from an electric line?
Remain clear of the wire that is hanging from an overhead line and get in touch with the distribution's utility company immediately. They have the proper safety equipment to deal with situations like this.
Is dirt a good insulator?
is foam dirt an metal a good insulator
What is the purpose of insulator in overhead transmission line?
Overhead lines are uninsulated, as they depend upon the air to provide insulation. However, they must still be insulated from the towers or poles from which they are suspended. This insulation is provided using glass or ceramic insulators. The greater the line voltage, the longer the ceramic insulator, or the greater the number of glass insulator 'dishes'.
Can something be a insulator of electricity?
It can if it has the proper characteristics that define what an insulator is.
What is symbol for insulator?
The symbol for an insulator is typically represented as a zigzag line.
What type of insulator use for transmission line?
answer
What are old powerlines along railrd tracks ,made of?
powerlines mounted on pylons, see Overhead power line. For lines carrying information, see Overhead cable. An overhead line or overhead wire is used to transmit electrical energy to trains, trolleybuses
Why is glass the best insulator for metal wire?
Glass has excellent insulation characteristics
How many suspenssion type insulation used in 66kv transmission line?
one insulator unit can bare 11kV. such that 66kV tx line needs 6 insulator units.
Is wool a heat conductor or insulator?
wool is a insulator
What is the characteristics of the line?
a line can end at a fixeded point
How can move the train with one transmission line?
There are always two. Live in the overhead line and neutral/earth in the tracks in contact with the wheels.
Why we can't send current or voltage without transmission line?
Well, there is no way of doing it without an overhead or underground transmission line.
What are the three basic characteristics of line?
The three basic characteristics of line are length, width, and direction. Length refers to the extent of the line, width refers to the thickness of the line, and direction refers to the path along which the line is drawn.
