What is a Lightning Arrester?
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<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
<strong>What</strong> <strong>is</strong> a<br />
<strong>Lightning</strong><br />
<strong>Arrester</strong>?<br />
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<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
NO…..<br />
It’s not a<br />
very fast<br />
Police<br />
Officer
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
According to<br />
most definitions,<br />
a <strong>Lightning</strong><br />
<strong>Arrester</strong> <strong>is</strong>….
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
A Device Used on<br />
Power Systems<br />
above 1000V to<br />
Protect other<br />
Equipment from<br />
<strong>Lightning</strong> and<br />
Switching Surges
It <strong>is</strong> not a <strong>Lightning</strong> Rod.<br />
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
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Although <strong>Lightning</strong> Rods<br />
are devices that divert<br />
lightning surges to<br />
ground, they are simple<br />
conductive terminals that<br />
are always at ground<br />
potential and are never<br />
energized.
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
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Other Devices<br />
Similar to <strong>Lightning</strong><br />
<strong>Arrester</strong>s<br />
Surge Suppressor: Th<strong>is</strong> <strong>is</strong> also a surge diverter,<br />
but generally for voltages well below 1000 volts.<br />
TVSS (Transient Voltage Surge Suppressor) Again<br />
th<strong>is</strong> <strong>is</strong> also a surge diverter, but generally for voltages<br />
well below 1000 volts.
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
How do<br />
<strong>Lightning</strong><br />
<strong>Arrester</strong>s Protect<br />
Power Systems?
Typically<br />
8400 Volts<br />
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
Impulse Sensitive<br />
Transformer<br />
System<br />
Without<br />
<strong>Arrester</strong><br />
115 or 220 Volts<br />
8
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
Typically<br />
8400 Volts<br />
Transformer<br />
115 or 220 Volts<br />
When<br />
<strong>Lightning</strong><br />
strikes the<br />
system<br />
----<br />
equipment<br />
<strong>is</strong> damaged<br />
and the<br />
lights go out<br />
9
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
Typically<br />
8400 Volts<br />
<strong>Lightning</strong> <strong>Arrester</strong><br />
However<br />
on a<br />
System<br />
115 or 220 Volts<br />
With an<br />
<strong>Arrester</strong><br />
10
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
Typically<br />
8400 Volts<br />
<strong>Lightning</strong> <strong>Arrester</strong><br />
When<br />
<strong>Lightning</strong><br />
strikes<br />
Sensitive<br />
115 or 220 Volts<br />
equipment<br />
<strong>is</strong> saved by<br />
the <strong>Arrester</strong><br />
11
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
<strong>What</strong> exactly does a<br />
lightning arrester<br />
do?<br />
•It Does not Absorb the <strong>Lightning</strong><br />
•It Does not Stop the <strong>Lightning</strong><br />
•It Does Divert the <strong>Lightning</strong> to Ground<br />
•It Does Clamp (limit) the Voltage produced by the <strong>Lightning</strong><br />
•It Only protects equipment electrically in parallel with it.
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
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Ok, how<br />
does it<br />
divert<br />
lightning?
To Power System<br />
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
At the Heart of All<br />
<strong>Arrester</strong>s <strong>is</strong> the Metal<br />
Oxide Var<strong>is</strong>tor (MOV)<br />
MOV<br />
MOV<br />
MOV<br />
MOV<br />
To Earth<br />
The MOV D<strong>is</strong>k <strong>is</strong> a<br />
Semiconductor that <strong>is</strong><br />
sensitive to Voltage.<br />
At normal Voltages the MOV<br />
d<strong>is</strong>k <strong>is</strong> an insulator and will<br />
not conduct current.<br />
But at higher voltages caused<br />
by lightning it becomes a<br />
conductor
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
MOV<br />
The MOV D<strong>is</strong>k <strong>is</strong> a very<br />
fast acting electronic<br />
switch<br />
It <strong>is</strong> an open switch to standard<br />
system AC voltages and a closed<br />
switch to lightning voltages
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
MOV<br />
By magnifying the<br />
MOV material 5000<br />
times, Metal Oxide<br />
Grains and Dopants in<br />
the material can be<br />
d<strong>is</strong>cerned<br />
5000X<br />
Each MOV D<strong>is</strong>k with a<br />
35mm diameter and a<br />
35mm height contains<br />
about<br />
28 Billion<br />
MOV Grains
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
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The MOV Grains and their Junctions are the<br />
Electronic Switches that turn on and off in un<strong>is</strong>on<br />
to divert the lightning around the equipment.<br />
The Switches<br />
are at the<br />
junctions<br />
between the<br />
grains<br />
ZnO Grain<br />
ZnO Grain<br />
Spinal Phase<br />
Very<br />
Nonlinear<br />
Part of Circuit<br />
ZnO Grain<br />
ZnO Grain<br />
Doped<br />
Junction<br />
Between<br />
Grains<br />
ZnO Grain<br />
Antimony<br />
Phase<br />
10 micro meters<br />
ZnO Grain<br />
ZnO Grains<br />
are low<br />
impedance<br />
linear<br />
element of<br />
circuit<br />
ZnO Grain
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
A lightning arrester <strong>is</strong> essentially a collection of<br />
billions of microscopic junctions of Metal Oxide<br />
Grains that turn on and off in microseconds to form a<br />
current path from the top terminal to the ground<br />
terminal of the arrester.<br />
<strong>Arrester</strong>Works.com<br />
Current<br />
path during<br />
<strong>Lightning</strong><br />
ZnO Grain<br />
Spinal Phase<br />
ZnO Grain<br />
Very<br />
Nonlinear<br />
Part of<br />
Circuit<br />
ZnO Grain<br />
ZnO Grain<br />
ZnO Grain<br />
Antimony<br />
Phase<br />
Doped<br />
Junction<br />
Between<br />
Grains<br />
10 micro meters<br />
ZnO Grain<br />
ZnO Grains<br />
are low<br />
impedance<br />
linear<br />
element of<br />
circuit<br />
ZnO Grain
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
So there you have it.<br />
A <strong>Lightning</strong> <strong>Arrester</strong> <strong>is</strong> a<br />
MOV<br />
MOV<br />
MOV<br />
MOV<br />
device, used on power<br />
systems, that contains<br />
billions of electronic<br />
switches that divert<br />
lightning around sensitive<br />
equipment and saves them<br />
from damage.<br />
MOV
<strong>Arrester</strong>Facts-009<br />
<strong>What</strong> <strong>is</strong> a <strong>Lightning</strong> <strong>Arrester</strong><br />
<strong>Arrester</strong>Works.com<br />
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