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A protective device that is used to protect the
electrical power system from surges caused by lightning is
known as <a href="http://www.jnearrester.com/surge-arrester/"
target="_self">surge arrester</a>. It includes two terminals
like high voltage and ground. Once an electric surge travels
through the surge arrester from the power system, then a huge
voltage current can travel to the insulation directly
otherwise to the ground terminal to protect the system from
damage.
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Not all surge arresters protect systems from lightning.
While lightning current arresters (Class 1) are used to
protect against direct lightning surge currents, surge
arresters (Class 2) protect equipment from induced surges in
electrical wiring. Surge arresters and lightning current
arresters from DEHN offer reliable protection against these
hazards. And there are many kinds of surge arresters such as
<a href="http://www.jnearrester.com/surge-
arrester/distribution-surge-arrester/"
target="_self">Distribution Surge Arrester</a>, <a
href="http://www.jnearrester.com/surge-arrester/station-
surge-arrester/" target="_self">Station Surge Arrester</a>,
<a href="http://www.jnearrester.com/surge-arrester/line-
surge-arrester/" target="_self">Line Surge Arrester</a>, etc.
Different surge arresters have to be equipped with different
<a href="http://www.jnearrester.com/metal-oxide-varistor/"
target="_self">Metal Oxide Varistor</a>s like <a
href="http://www.jnearrester.com/metal-oxide-varistor/5ka-
varistor/" target="_self">5kA Varistor</a>, <a
href="http://www.jnearrester.com/metal-oxide-varistor/10ka-
varitor/" target="_self">10kA Varitor</a>, etc.
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<strong>How Does a Surge Arrester Work?</strong>
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The purpose of a surge arrestor is to protect
insulation/components from high DV/DT that peak at
instantaneous values that are in excess of the breakdown of
the insulation or component. Lightning is one common cause of
voltage surges. Another common cause is switching in an
inductive circuit.
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It is possible to capture the occurrence of a voltage
surge. Some surge arresters are equipped with "surge
counters" that capture the fact that the arrester has
discharged current. It is also possible to use other
phenomena (sound measurement, light measurement, electric
field measurement, etc.) to capture the occurrence of a
discharge. Meteorologists routinely capture and record
lightning discharges using both ground-based and satellite-
based instruments.
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It is also possible to capture and record voltage surges,
but here the technology gets complicated. A common issue is
that a voltage surge is inherently a high-frequency
phenomenon, and in order to capture and record (ie, quantify)
the event, the measurement system must have a high-frequency
response. The kind of instruments that are commonly applied
for fundamental frequency voltage measurements don't have
sufficient frequency response to accurately capture and
record high-frequency voltage transients. They may be able to
capture the occurrence of the event, but it is not always
possible to accurately quantify the event using those
devices.
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A surge arrester is a device that protects electrical
power systems from damages caused by lightning. A typical
surge arrester has both a ground terminal and a high-voltage
terminal. When a powerful electric surge travels from the
power system to the surge arrester, the high voltage current
is sent directly to the insulation or to the ground to avoid
damaging the system.
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<strong>How to Install?</strong>
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Generally, the installation of surge arresters can be
done close to an electric meter to defend the electrical
system used in a residence or building from the power surge
effects which are occurring from the outside.
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It protects other electrical devices that are connected
to the power source, however, they cannot provide whole
protection from surges that occurs from defective wiring
otherwise the overall working of electrical appliances used
in homes or in offices.
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