26-02-2011, 09:35 AM
presented by:
RAMNIWAS GURJAR
A SEMINAR.ppt (Size: 1.01 MB / Downloads: 828)
LIGHTING ARRESTER
INRTODUCTION
Lightning arresters or surge diverters are used to protect the earth screen and ground wires in an electrical system against direct lightning strokes. They conduct the high voltage surges to the ground without getting affected to the system. The lightning arrestor provides a cone of protection which has a ground radius approximately equal to its height above the ground.
The surge diverters consist of a spark gap in series with a nonlinear resistor. The function of non linear resistor is very important. As the gap sparks over, due to the over voltage, the arc would get short circuited and may cause power flow current in the arrester. Since the characteristic of the resistor is to offer high resistance to high voltage, it prevents the effect of a short circuit. After the surge is over, the resistor offers high resistance to make the gap non-conducting.
One end of the arrestor would be connected to the terminal of the equipment to be protected and other end would be grounded. The length of the spark gap is set in such a way that normal line voltage is enough to cause an arc across the gap but high voltage would break down the air insulation and form an arc.
INSTALATION OF LIGHTNING ARRESTOR ON BUILDING :-
Accessories required during installation of the IONIFLASH
Tester
The ESE Air Terminal active heads can be checked by the tester any time. The tester will indicate OK or FAULT
Lightning Strike Counter
The lightning strike counter is able to count all lightning events for a latter reference. It has a mechanical counter display.
INSTALATION OF LIGHTNING ARRESTOR ON BUILDING :-
Installation
1.Lightning Arrestor
2.GI / SS Mast
3.Down conductor (Cu cable/Strip)
4.Bar saddle, Top clamp, Nuts & Bolts,
5.Anchor fasteners.
6.Maintenance Free Chemical Earthing
PRINCIPLE OF OPERATION :-
The function of the lightning rods consists of emitting an ascending electrical unloading to influence the effect of the descendent tracer. When one propagates towards the cloud, this ascending unloading generates an electric field sufficient to modify the trajectory of the descendent tracer, allowing the unloading of the ray to earth. This process can be realized naturally but the action of lightning rods IONIFLASH allows a fast activation but, providing an effective protection but.
This it is the concept of the fattened advance of.
1.Level of protection classified of very high
2.It does not need external power supply.
3. It does not need special maintenance.
WITHOUT PROTECTED HOUSE WITH LIGHTING ARRESTOR :-
PROTECTED HOUSE WITH LIGHTING ARRESTOR
EARTHING ARRENGMENT OF LIGHTING ARRESTOR
GI SAFE ERTHING ELECTRODE
1.This is the Chemical Ground Electrodes
2. It provide a low-impedance ground in locations of high soil resistively.
3.Together with JMV Backfill Compound, the system dissipates lightning energy and other dangerous electrical fault currents, even in sandy or rocky soil conditions