what is the difference between zno surge arrester with air gap and without air gap? ....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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sir i have problem about surge arrester..my query is how to calculate the ratings of surge arrester for power system..

thanks
regards hamid ehsan
email id.. [email protected] ....etc

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lightning frequency arrester ppt

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. The typical lightning arrester has a high-voltage terminal and a ground terminal. 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.

In telegraphy and telephony, a lightning ar ....etc

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To get full information or details of silicon oxide nitride oxide silicon please have a look on the pages

http://seminarsprojects.net/Thread-silicon-oxide-nitride-oxide-silicon-memmory-sonos

if you again feel trouble on silicon oxide nitride oxide silicon please reply in that page and ask specific fields in silicon oxide nitride oxide silicon ....etc

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lightning arrester
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. The typical lightning arrester has a high-voltage terminal and a ground terminal. 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.
In telegraphy and telephony, a lightning arrestor is plac ....etc

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The details of the method for biological synthesis of Zinc oxide nanoparticles using plant extract ....etc

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A SONOS memory cell is formed from a standard polysilicon NMOS transistor with the addition of a small sliver of silicon nitride inserted inside the transistor's gate oxide. The sliver of nitride is non-conductive but contains a large number of charge trapping sites able to hold an electrostatic charge. The nitride layer is electrically isolated from the surrounding transistor, although charges stored on the nitride directly affect the conductivity of the underlying transistor channel. The oxide/nitride sandwich typically consists of a 2 nm thi ....etc

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Please send me seminar and ppt for lightning arresters.The specific details needed are
1.Design
2.Function
3.Working
4.Manufacturing
5.Comparison of polymeric housed and porcelain lightning arresters ....etc

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Biodiesel production from Jatropha caucus oil in a batch reactor using zinc oxide as catalyst



INTRODUCTION

Majority of the world energy needs are supplied through
petrochemical sources, coal, and natural gases, with the
exception of hydroelectricity and nuclear energy. Of all
these sources that are finite, the current usage rates will
be consumed shortly. Non-renewable energy sources
such as petroleum are related to several drawbacks
including; increase green house emission ....etc

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