How Lightning Events Interfere With Communications
What is a Lightning Event?
A lightning “event” is an occasion where lightning affects communications equipment, either through a direct strike to the equipment, or as a side effect of an indirect strike. They can cause significant (and sometimes irreparable damage) to towers, antennas, and other equipment, which results in costly replacements and downtime.
Why Tower Sites Are Damaged In a Lightning Event
When it comes to communications equipment, tower sites are struck by lightning more often than any other site. The reason is obvious: towers are higher than the surrounding terrain, and they are conductors!
Tower structures have a certain amount of resistance and inductance per foot. Most people think of resistance when talking about lightning. However, a tower with all of its weight has rather small joint resistance, typically less than .001 ohms.
Inductance
Every conductor has inductance. The amount of tower inductance is dependent upon its geometric configuration. The width-to-height ratio will determine the total inductance of a tower. The white paper below explores the inductance variables for self supporting towers and guyed towers in great detail.
How Do You Manage A Lightning “Event”
Lightning is an important factor to consider when discussing communications equipment. As lightning is not predictable, there needs to be an existing system in place that protects communication devices and equipment during lightning events. Whether your equipment is at a radio site, pipeline, utility sub-station, telephone central office, or sensitive security installation, the same requirements apply for proper device placement and earth grounding.
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