Air terminals and accessories, conductors and earthing components for lightning protection installations
Air terminals and accessories, conductors and earthing components for lightning protection systems
Lightning is one of the most naturally destructive phenomena. There is no device capable of preventing the formation of lightning, but it is possible to minimize its effects with a lightning protection system.
Air termination system:
Air terminals (Early Streamer Emission (ESE) air terminals or Franklin rods and meshed conductors.
The lightning air terminal is an essential piece of the lightning protection system. It must be the point of controlled impact of a discharge, so as to provide the lightning current with a path to ground without damaging the protected structure.
ESE Air Terminals are characterized by emitting a continuous upward leader before any other object within their protection radius. The DAT CONTROLER® line from Aplicaciones Tecnológicas DAT Controler Plus and DAT Controler Remote) have passed all tests according to the regulations and have the best operational guarantees.
Protection by Franklin rods and meshed conductors consists in distributing and dissipating the discharge current of lightning through a network of down conductors and earthing systems. The installation, sections and materials must comply with the provisions of the standards that define this type of system (series IEC 62305, IEC 62561).
ESE air terminals
ESE air terminals emit a continuous upward leader before any other object, which increments the protection zone and provides lightning current a safe path to the earthing, thus protecting people and structures within its protection radius.
Essential components for connecting and fixing the conductors and other elements of the installation. They should reist the lightning electrodynamic effects, the corrosion and other environmental effects.
Earthing and other measures that minimize damages caused by lightning (equipotential bonding, surge protection)
Earthing conducts and disperses the lightning current to the ground. These measures, together with the equipotential bonding, prevent physical damage to structures. However, the effects of lightning can also enter through the service lines themselves. To prevent damage to electrical and electronic equipment surge protection devices are installed.
How to achieve a good earthing for a lightning protection installation.
In order to obtain an effective grounding, it is essential to achieve a low ground resistance, using conductors with a high resistance to corrosion and a suitable section to transport the expected current. It is also advisable to bond the connections of said conductors by exothermic or aluminothermic welding Apliweld® Secure+.
Other determining factors when designing an earthing system include:
The resistance should be measured regularly making it necessary to install an earth inspection pit. Aplicaciones Tecnológicas provides these inspection pits.
The soil humidity will reduce the earthing resistance.
Earthing enhancing compounds reduce the soil resistivity.
Buried electricity and gas installations should be identified in order to respect the security distances for each.
Buried pipes and water tanks should be identified in order to equipotentially bond them with the earth system.
To obtain a suitable earth resistance in earthing systems, special electrodes should be used for low-conductivity soils – enhanced electrodes, such as APLIROD dynamic electrodes or graphite electrodes. Deep electrodes or ring conductors may be used.