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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.
What else can I help you with?
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 holds up power lines?
Power lines are held up by tall metal structures called transmission towers or poles. These structures are designed to support the weight of the power lines and withstand environmental factors like wind and weather. The power lines are typically attached to insulators on the towers to prevent electricity from traveling down the structure.
Where can you find insulators near power lines?
look up the pole
What do you call those ceramic things on the top of phone lines?
Insulators.
What are the differences of heat and sound insulator?
Heat insulators are materials that reduce the transfer of heat energy, while sound insulators are materials that reduce the transmission of sound energy. Heat insulators typically have high thermal resistance to prevent heat from flowing through them, whereas sound insulators absorb or reflect sound waves to reduce noise transmission. Heat insulators are important for maintaining temperature control, while sound insulators are used to reduce noise pollution.
