Mathiasen Clark posted an update 10 months ago
Lightning strokes, which amount to 200 kA or 300 kV, cause hazards to the equipment or location, so lightning protection is vital for operation.
Allow us to commence with the initial note about what is lightning and why lightning protection can be so important. The basic phenomenon behind lightning is the fact that charges accumulated from your cloud and the earth are equal and opposite. This forms a non-uniform potential gradient surface in mid-air. If the gradient is larger as opposed to potential from the surface, the breakdown occurs and a "streamer" flows in the cloud towards the earth.
A primary stroke occurs when the lightning hits the ability systems directly how the immense potential may cause destruction in the equipment or facility. In comparison, an indirect stroke is carried out in the lightning discharges within the proximity in the power line or from electrostatic discharge on the conductor due to charged clouds.
The principle power system elements requiring lightning protection are power feeds, home alarm systems, telephone lines, data and control systems and RF cables.
Methods of Lightning Protection. The rolling sphere method is employed for identifying the precise positioning of the lightning and surge protection devices at the equipment under operation.
Protection of the power line against direct strokes is by a ground wire or protector tube. The first sort produces electrostatic screening, that’s suffering from the capacitances in the cloud to line along with the line to ground. The latter forms an arc between your electrodes, causing gas deionisation.
Rooftop/Frame Protection. It’s interesting to notice the building and rooftop frame or cladding is preferably metal than insulation type.
Installing of a finial at the top of the energy tower must have the very least distance of a single.5 m over the highest antenna or lights. Such a rooftop or building frame is constructed of reinforced steel for protection purpose.
Wooden towers without downconductors might cause a hearth hazard, while they route the incoming charges to ground. In principal, for non-metallic roofs, proper downconductors needs to be installed on the appropriate location and height.
Device Protection. Antenna lightning protection is supplied through spark gap, the gas discharge tube and quad-wavelength shorted stub. The 1st method uses ball points in order that in case a strike occurs, high potential forms between them as well as the ground. The second method causes gas deionisation through arc formation relating to the electrodes. The very last method utilizes a coax transmission line over the transmission line so that system bandwidth is narrow.
A lightning arrester can be a device offering lightning protection by regulating spark gaps. The product classification may range from rod gap, horn gap and valve type to metal oxide lightning arresters.
Earthing and Bonding Solutions. Now learn about how earthing and bonding solutions for lightning protection should be afforded. The design of earth rods, terminals or clamps ought to be in ways to route the incoming transients to earth to minimise step and touch potentials. The geometric measurements chosen should abide by the IEEE and NFPA standards. Any earthing system needs to have proper bonding, as ground potential rise is not compensated. Again, the number of interconnects and spacing should be designed per the lightning standards.
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