What is horn gap lightning arrester?
What is horn gap lightning arrester?
Horn Gap Arrester It consists of two horns shaded piece of metal separated by a small air gap and connected in shunt between each conductor and earth. The distance between the two electrodes is such that the normal voltage between the line and earth is insufficient to jump the gap.
Where is Horn gap arrester used?
Lightning arrestor is connected between the line and earth. It is a protective device which conducts the high voltage surges (due to both direct and indirect stroke) on the power system to the ground and protects the equipments connected to it.
How does a horn gap arrester work?
(2) Horn gap arrester It consists of a horn shaped metal rods A and B separated by a small air gap. The horns are so constructed that distance between them gradually increases towards the top as shown. The heated air around the arc and the magnetic effect of the arc cause the arc to travel up the gap.
At what location the lightning arrester is mounted?
Lightning arrester usually located near the Transformer in the substation. In a high voltage system, the surge diverter can be used to defend the transformers, lines, circuit breakers, generators, bus bars, circuit breakers, etc.
What is lightning arrester PPT?
INTRODUCTION OF LIGHTNING ARRESTERS 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.
What are the disadvantages of horn gap arrester?
Due to the above Iimitations, the horn gap arrester is rarely used in practice. Also it has low reliability and hence used as secondary protection.
What is the best location of lightning arrester?
Lightning arrester should be located close to the equipment that it is expected to protect. In large substations, arrestors should be installed at take-off points of the lines and of the terminal apparatus.
How do you install a lightning arrester for an electric fence?
Install a lightning arrester between the fence and the controller. Install one on every corner of the fence if possible. Keep these devices at least 50 feet from the energizer. Add a Storm Guard to your 1 joule or higher charger to absorb any lightning that is able to move past the other devices.
How does a rod gap lightning arrester work?
Horn gap type lightning arrester consists of two horn-shaped metal rods separated by a small gap as shown in the diagram. The horns are constructed that the distance between horns increases gradually toward the top. this horn assembly mounted on the porcelain insulator and one end of horn connected to the line through choke and resistor.
What makes a valve in a lightning arrester?
The diagram shows valve type lightning arrester contains numbers of series-connected gaps, coils units, and the valve elements of nonlinear resistance material usually made of silicon carbide discs. the nonlinear resistors are connected in series with the spark gap and all this assembly fitted in the tight porcelain container.
Which is the best type of lightning arrester?
Expulsion Type Lightning Arrester: Arresters of this type have an improvement in the distance of the rod in which it shuts off the frequency of power. This air raster uses a tube made of fiber which is very effective, separating the spark gap and the interrupted spark gap inside the fiber tube.
What is the distance between rod and insulator of lightning arrester?
One end of lightning arrester connected to the line and another end of rod connected to the earth. The distance between rod and insulator must not be less than 1/3 of the gap length so the arc may not reach the insulator and damage it.
