This is a human made ystem which protects the external part
of building, tower, Mall etc from lightning which occurs
during thunderstorms, and sometimes during volcanic
eruptions or dust storms, due to an atmospheric discharge
of electricity between cloud to cloud, clouds to earth.
lightning flow is mainly low resistance side(i.e
TREE,CRANE,SUPPLY LINE).so only lightning arrester made
with low resistances.It is the main reson to observe the
lightnings.it Always fix the top of manual
operating.lightning arrester used to protects the
Lightning arrester is a protective device which conduct
high voltages surges on the power system to the ground.It
consists of spark gap which is connected in series with the
non-variable resistance,its connection is that one end is
connected to the terminal of the equipment which is to be
protected and other end is effectively grounded.
The property of non-variable resistance is that it offers
low resistance when voltage is high.
lightning arrester is metallic device which is capable of
conducting electricity, which is placed above the multi
storeyed buildings and transformers and other receiving
stations,sub stations.the main purpose of lightning arrester
is to protect the buildings and equipments from
thunder&lightning during rainy seasons..this device will be
connected to the earth from the top of the building through
a wire,which is capable of sending high voltage into earth
LA is a non-linear resistor i.e. during normal condition it
offer high resistance but during abnormal condition
(abnormal voltage ) it acts as a low resistor thus allow
the heavy fault current and provide path to ground.
It is pointed one as charge resides/attracted by pointed
object and always placed at top of switchyard/building.
Lightning arrester is a device that is used for the
protection of electrcal devices and electrical system e.g at
the power station it is installed at power transformer ,
main purpose is to protect system against lightning impulse
.. it is non linear resistance normally open in case of
lightning impulse it grounds all the voltage and protects
systen against extra high voltage
LA is non-linear resister.LA is installed on transmission
line,transformer and other electrical equipment.LA are used
to protect the equipment against lightning-stroke(high
voltage) and provide path from top to ground so lightning
stroke directly into ground.
Lighting arrester is a proctective arrangment which provide
protection against high voltage surge. During lighting and
other condition when high voltage surge genarate then it
provide path for surge through earth.
1)Why potential transformer primary site grounded?
2)can be loop between neutral & body for grounding?
3)What is the difference between ELCB &RCCB?
4)Why we use iron core in transformer insted of wooden core?
5)what is the principle of excitation?
6)Why we test the core balance test for transformer?
7)what is creepage?What is the creepage length for
insulators at different voltages?
8)How much type of relays used for differential protection
of generator,transformer & busbar protection?