A lightning arrester is a device used on electrical power systems and telecommunications systems to protect the insulation and conductors of the system from the damaging effects of lightning.
When a lightning surge (or switching surge, which is very similar) travels along the power line to the arrester, the current from the surge is diverted through the arrestor, in most cases to earth.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, sometimes several kilometers long, stretching between the discharge points.
The possibility of discharge is high on tall trees and buildings rather than to ground.
Buildings are protected from lightning by metallic lightning rods extending to the ground from a point above the highest part of the roof.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, sometimes several kilometers long, stretching between the discharge points.
The possibility of discharge is high on tall trees and buildings rather than to ground.
Buildings are protected from lightning by metallic lightning rods extending to the ground from a point above the highest part of the roof.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, sometimes several kilometers long, stretching between the discharge points.
The possibility of discharge is high on tall trees and buildings rather than to ground.
Buildings are protected from lightning by metallic lightning rods extending to the ground from a point above the highest part of the roof.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, sometimes several kilometers long, stretching between the discharge points.
The possibility of discharge is high on tall trees and buildings rather than to ground.
Buildings are protected from lightning by metallic lightning rods extending to the ground from a point above the highest part of the roof.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, sometimes several kilometers long, stretching between the discharge points.
The possibility of discharge is high on tall trees and buildings rather than to ground.
Buildings are protected from lightning by metallic lightning rods extending to the ground from a point above the highest part of the roof.
Lightning, is a form of visible discharge of electricity between rain clouds or between a rain cloud and the earth.
The electric discharge is seen in the form of a brilliant arc, so
2. •Lightning, is a form of visible discharge of
electricity between rain clouds or between a
rain cloud and the earth.
•The electric discharge is seen in the form of a
brilliant arc, sometimes several kilometers
long, stretching between the discharge points.
The possibility of discharge is high on tall
trees and buildings rather than to ground.
•Buildings are protected from lightning by
metallic lightning rods extending to the
ground from a point above the highest part of
the roof.
3. •The conductor has a pointed edge on
one side and the other side is connected
to a long thick copper strip which runs
down the building.
•The lower end of the strip is properly
earthed.
•When lightning strikes it hits the rod and
current flows down through the copper
strip.
•These rods form a low-resistance path for
the lightning discharge and prevent it
from travelling through the structure itself.
4. •A lightning arrester is a device used on
electrical power systems and
telecommunications systems to protect the
insulation and conductors of the system
from the damaging effects of lightning.
•When a lightning surge (or switching surge,
which is very similar) travels along the
power line to the arrester, the current from
the surge is diverted through the arrestor, in
most cases to earth.
PUPOSE OF LIGHTNING
ARRESTOR
5. Franklin Cone
•A FRANKLIN lightning rod protects the volume of a cone in which
the radius of the base is equal to the height.
•This method is satisfactory for Church Spires, tall industry chimneys
and tower buildings in which the zones to be defended are
contained within the cone.
6. Overhead ground shield wire
Forming a continuous air terminal, this shield
is linear and horizontal, so the protected
volume is a triangular prism rather than a
cone. This is most commonly used to protect
overhead transmission lines
7. Faraday Cage
•A FARADAY cage installation comprises
multiple air terminals, not less than one foot
high, fixed at all salient points on the roof and
bonded together with copper roof conductor
and down conductor to form a cage having a
mesh not greater than 100 feet and with air
terminals at the intersections.
• This method is not satisfactory because it
leaves the areas of roof between the
conductors unprotected unless these areas
are defended by air terminals or roof
conductors at higher levels.
