OVERVOLTAGE PROTECTION DEVICES

Technologies involved:
In the voltage switching category comes the Spark Gaps(SG) and Gas Discharge Tube(GDT) technology. In the Voltage limiting category comes the metal oxide varistor technology(MOV) and the siicon avalanche diode(SAD) technologies.
1)AIR TERMINATIONS
To protect the volume from direct lightning strikes
and to avoid uncontrolled strikes air termination are
used . Air termination is comprised by
air-termination rods and air-termination wires.
The location of air te ....etc

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Lightning and Surge Protection Of Modern Electronic Systems

Introduction
In virtually all aspects of our modern lives, microprocessors and integrated circuits (ICs) are hard
at work processing digital data, controlling critical systems and communicating information
through ever-expanding global networks. These now common components have dramatically
lowered system costs while increasing the power and flexibility of modern electronic systems in a
manner unimaginable just a few years ago. Yet, few developers se ....etc

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ABSTRACT
The recent growth of power circuit capacities has caused fault currents to increase. Since the protection of power systems from the fault currents is very important, it is needed to develop a fault current limiter. A fault current limiter is required to assure (1) rapid reaction to fault currents, (2) how impedance in normal operation and (3) large impedance during fault conditions. A super conducting fault current limiter (SCFCL) can meet these requirem ....etc

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MODERN ZINC OXIDE SURGE ARRESTER



Introduction
The most important matter in a
power system is how to handle a fault condition. In power
system networks we have to maintain the voltage, current
and other network parameters at a specified value .
If an abnormal condition is occurred we
must take precaution against the abnormality to protect
the succeeding elements connected to the network.There
are many modern technique to clear the over voltage
condition due to surge fault ....etc

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