What happens if a transmission line insulator gets damaged?

Overhead line insulators It is obvious that if overhead power lines are not properly insulated from their support poles/towers, the current will flow towards the ground through the poles/towers which also become hazardous. Of course, the power line won’t even work in that case!

What are the causes of failure of line insulator?

Causes of Insulator Failure

• Cracking of Insulator.
• Defective Insulation Material.
• Porosity in The Insulation Materials.
• Improper Glazing on Insulator Surface.
• Flash Over Across Insulator.
• Mechanical Stresses on Insulator.
• Power Frequency Dry Flashover Test of Insulator.

When an insulator breaks down by puncture it is Dash damage?

A punctured insulator is: Permanently damaged.

What is flashover of insulator?

A flashover is an electric discharge over or around the surface of an insulator. When an electrical flashover occurs, conductors can vaporize, expanding to thousands of times their original volume. A flashover is an electric discharge over or around the surface of an insulator.

Why do insulators puncture?

Simply, it means electrical discharge occurs from conductor to pin through the body of the insulator. Generally, the pin insulator is designed with a factor of safety. Basically, insulator puncture will occur due to switching over voltage and lightning.

What happens when some serious phenomenon occurs in the insulator?

What happens when some serious phenomenon occurs in the insulators? Explanation: The serious phenomenon is the abnormal over voltage, produced in the insulators. Due to that, flashover occurs in the insulators. This causes puncher of the insulator body.

Which of the following causes permanent damage to a transmission line insulator?

Breakdown Due to High Voltage the system voltage increases suddenly due to lightning strokes on the transmission line and switching surges. If the rate of rising of surge voltage is more than the building of dielectric strength then the breakdown of the Insulator occurs that is permanent.

What kind of insulator will be used if the direction of the transmission line is changed Mcq?

Strain Type Insulator
Strain Type Insulator: Hence strain type of insulator will be used if the direction of the transmission line is to be changed.

How electrical breakdown can occur in an insulator?

All insulating materials undergo breakdown when the electric field caused by an applied voltage exceeds the material’s dielectric strength. Under sufficient electrical potential, electrical breakdown can occur within solids, liquids, gases or vacuum.

What is back flashover in transmission line?

Back flashover occurs when lightning stroke terminates on the overhead ground wire or tower. A stroke that so terminates forces currents to flow down the tower and out on the ground wires. If these voltages equal or exceed the line critical flashover voltage (CFO), flashover occurs.

What is insulator in transmission line?

The term insulator is also used more specifically to refer to insulating supports used to attach electric power distribution or transmission lines to utility poles and transmission towers. They support the weight of the suspended wires without allowing the current to flow through the tower to ground.

What happens if a transmission line is not properly insulated?

If transmission lines are not properly insulated from their support poles/ transmission towers, the current will flow towards the ground through the poles/towers which also become dangerous for living beings. Of course, the transmission line won’t even work in that case.

What is the function of insulator in transmission line?

Function of insulator in transmission line is to seperate the conductor from the transmission tower. If transmission lines are not properly insulated from their support poles/ transmission towers, the current will flow towards the ground through the poles/towers which also become dangerous for living beings.

What causes wire insulation to go bad?

Insulation damaged because of heat In addition to age, overloading of a circuit may cause damage or deterioration to a wire. The overloading creates heat, and it is the heat that causes the damage to the wires insulation. Repairing of frayed or damaged insulation

What causes a power line to fail?

Failures occurring in practice are usually due to lightning or to deposits of soot or sea salt on the insulator surface. Lightning affects the design of the transmission line rather than that of the insulators. Often no permanent damage is done by lightning flash-over.