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Lightning Protection

 
LIGHTNING PROTECTION SYSTEM

Lightning is a capricious, random and unpredictable event. Its physical characteristics include current levels sometimes in excess of 100 kA and speeds approaching one third the speed of light. Globally, some 2000 on-going thunderstorms cause about 100 lightning strikes to earth each second.

What is Lightning ?

Lightning is a discharge of atmospheric electricity that is triggered by a build-up of differing charges within a cloud. The result is a sudden release of energy that causes a distinctive bright flare, followed by a thunderclap.

How does it reach ground ?

The bottom of a cloud becomes negatively charged, and it sends out heat in known as a “leader" that seeks a positive charge on the earth. As the leader approaches an area that is positively charged, a positively charged steamer emerges, meeting the leader,sealing the connection and generates a bolt of lightning. That's how the loop is complete.
It's pretty clear that lightning makes every thunderstorm a potential killer, whether the storm produces one lightning bolt or 10,000 that generates a strong need for an efficient lightning protection system.
Early  Streamer Emission  Air  Terminal
Early streamer Emission (ESE) air terminals are designed to emit a streamer early in the streamer-formation phase of a lightning strike, thereby becoming the preferred lightning attachment point.

As the ground charge builds immediately before the lightning strike, the ESE air terminal accumulates ground charge. In the instant before the strike, when the stepped leaders are branching down from the cloud, the ESE terminal emits a series of pulses of ground charge, forming a streamer from itself before streamers emit from other structures. Its streamer reaches the stepped leaders before competing streamers, thereby winning the competition. Ground charge accumulation and streamer triggering is done by ESE Air Terminal.