Lightning Arrester


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lightning arrester

[′līt·niŋ ə‚res·tər]
(electricity)
A protective device designed primarily for connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equipment. Also known as arrester; surge arrester.

Lightning Arrester

 

a device used to protect buildings and transportation, public, and agricultural structures from lightning strokes. A lightning arrester consists of an electrode in the shape of a thin metal rod with a point at one end, located above the object being protected (a lightning rod), or a wire electrode (cable), which is usually suspended above power lines (lightning-protection cable), and reliable grounding with a total resistance not exceeding 10–20 ohms. The protective effect of a lightning arrester depends strongly on the dimensions of the protected zone, whose boundaries are determined by the locus of the points enclosing a space within which the probability of a direct lightning stroke is 10−3 to 10−4 (the lightning arrester intercepts more than 99 percent of lightning discharges).

The protected zone of a single rod-shaped lightning arrester has roughly the shape of a cone with a vertex angle of 45°; a single lightning-protection cable has a protected zone shaped like a trihedral prism, with the cable forming one of its edges. In the presence of two or more lightning arresters, an object may be protected even if it is not within the protected zones, since in this case the probability of lightning striking the object is markedly reduced. In power substations the operating ground is usually used to lead off lightning currents.

For small residential buildings and other buildings with metal roofs, adequate lightning protection can be obtained by secure grounding of the roof. In practical terms, buildings with central heating systems, water supply piping, and underground electric wiring are protected from lightning and do not require special lightning arresters.

To protect buildings in which the formation of explosive mixtures, dusts, vapors, or gases is possible, the lightning arresters are insulated from the buildings and are usually single, free-standing lightning rods located in such a way that all parts of the building are within the protection zones. In this arrangement each lightning arrester must have its own grounding.

lightning arrester

lightning arrester
A device which is connected in an electric wiring system (usually between a line voltage terminal and ground) to protect the wiring system from damage from lightning or any other abnormally high surge of voltage.
References in periodicals archive ?
NAIA lightning arresters have a spherical (or dome) coverage of 100 meters.
In a statement, Miaa general manager Ed Monreal said that 20 lightning arresters were installed at the four Naia terminals and nearby buildings.
The shortest distance in the air between the lightning arrester and the substation equipment nearest to it should be not less than permissible.
'I am urging the Ethics and Anti-Corruption Commission to move with speed and investigate Budalangi CDF to establish the quality of the lightning arresters that had been bought and installed at the learning institutions because I suspect they are substandard and faulty, yet Sh2 million was spent on each of the arresters,' the MCA said.
According to the MIAA, the current 20 lightning arresters of the NAIA were upgraded in 2016.
Marani MCA Dennis Ombachi had earlier sought a statement from the department of transport, roads and public works concerning the installation of lightning arresters in school, public institutions and residential houses.
In a radio interview, Manda, said the solution to the any lightning threatening the airport was very simple, and that management should just acquire more lightning arresters that the operations of the airport will not be jeopardized.
According to Monreal, 20 lightning arresters were upgraded in 2016 to ensure better protection of the public.
Morgan Electro Ceramics has introduced high voltage laser discharge ceramic capacitors for use with peak current and repetition rates in applications such as gas lasers, high energy pulsed power supplies, DC power supplies, lightning arresters and X-ray power supplies.
Initial findings indicate that the fire was caused by a lightning strike accompanying the monsoon rains enhanced by Mario early Friday, despite the four Naia terminals being equipped with lightning arresters to prevent such disruptions.