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The same reason insulation is used on electrical wire.
The voltage at which transmission lines are operated, can produce serious short circuits, if two of the lines make contact, and depending on the system, can arc to the ground (earth). This can cause serious injury or death if a person happens to be in harms way.
If you examine these line insulators, you will find there are many "hills and valleys" on the surface of them. This is to increase the "creep" length of the insulator and total distance between conductors and ground.
At this high voltage, the current will arc for some distance.
In general, insulators are for protection of the continuity of the power supply to the system's users.
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How are electrical insulators made?
The insulators used on high tension transmission lines and on distribution lines are made of either glass or ceramic shaped in a mold. On high tension lines several are typically stacked to create a compound insulator that can avoid arcing at the voltage on the lines.
How can measure the voltage only seeing the insulators in a high voltage transmission lines?
i think 11kv per insulator
What is corona power loss in transmission line hvdc?
A: Transmission lines while there is ceramic insulators providing separation to the phases will have a corona if the insulators are dirty providing small current leakage ionizing the air around it therefore corona effect.
What is long rod insulator?
High rod insulators are used for the insulation of medium and high voltage transmission lines. Long rod insulators meet IEC standards and are rated up to 800 kV.
What is an anchor pylon?
An anchor pylon is an end point which utilizes horizontal insulators and occur at the end points of high-power transmission lines.
What type of losses occur in power transmission lines?
1. Wire resistance 2. Leakage around insulators 3. People stealing the power
Why are glass insulators used on power lines?
The large glass insulators are easy to mould, and are strong, well able to insulate the pylons from the high voltage the cables are designed to carry.
Why dc supply cannot be given to transmission lines?
We can use DC too for the transmission system. Refer HVDC transmission system.
What do you call those ceramic things on the top of phone lines?
Insulators.
Where can you find insulators near power lines?
look up the pole
Why 22kv 11kv 33kv 132kv 220 kv are standard transmission voltages in transmission lines why not 20kv 10kv etc?
Its just a matter of standard. In my area, for instance, we use 13.2 KV for distribution lines, and 69 KV / 138 KV for transmission lines.
Where are insulators use?
In buildings
