Mathiasen Clark posted an update 2 weeks ago
Lightning strokes, which figure to 200 kA or 300 kV, cause hazards on the equipment or location, so lightning protection is essential for operation.
Let us focus on your initial note in regards to what is lightning and why lightning protection is really important. The essential phenomenon behind lightning is always that charges accumulated in the cloud and the earth are equal and opposite. This forms a non-uniform potential gradient surface up. When the gradient is bigger than the potential of the surface, the breakdown occurs plus a "streamer" flows from the cloud towards the earth.
A primary stroke happens when the lightning hits the electricity systems directly how the immense potential will cause destruction with the equipment or perhaps the facility. In contrast, an indirect stroke occurs from the lightning discharges from the proximity from the power line or from electrostatic discharge on the conductor as a result of charged clouds.
The key power system elements requiring lightning protection are power feeds, security systems, telephone lines, data and control systems and RF cables.
Ways of Lightning Protection. The rolling sphere way is used for identifying the exact placement of the lightning and surge protection devices near the equipment under operation.
Protection of the power line against direct strokes is through a ground wire or protector tube. The first sort produces electrostatic screening, which is impacted by the capacitances from the cloud to line and also the line to ground. Rogues forms an arc involving the electrodes, causing gas deionisation.
Rooftop/Frame Protection. It can be interesting to notice the building and rooftop frame or cladding is preferably metal than insulation type.
Installation of a finial on top of the electricity tower must have a nominal amount distance of 1.5 m across the highest antenna or lights. Such a rooftop or building frame is made of reinforced steel for defense purpose.
Wooden towers without downconductors might cause a fireplace hazard, since they route the incoming charges to ground. In principal, for non-metallic roofs, proper downconductors needs to be installed at the appropriate location and height.
Device Protection. Antenna lightning protection emerges 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 bewteen barefoot and shoes and the ground. The next method causes gas deionisation through arc formation relating to the electrodes. The past method works on the coax transmission line over the transmission line so that system bandwidth is narrow.
A lightning arrester is often a device offering lightning protection by regulating spark gaps. These devices classification may range between rod gap, horn gap and valve type to metal oxide lightning arresters.
Earthing and Bonding Solutions. Now let’s talk of how earthing and bonding solutions for lightning protection should be afforded. The appearance of earth rods, terminals or clamps needs to be you might say to route the incoming transients to earth to minimise step and touch potentials. The geometric measurements chosen should comply with the IEEE and NFPA standards. Any earthing system should have proper bonding, as ground potential rise can’t be compensated. Again, the volume of interconnects and spacing needs to be designed per the lightning standards.
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