Lightning Prevention System using Lightning Dissipaters

Work in Progress - Lightning

Lightning

When harsh sunlight hits the surface of the earth, water from the surface of the earth turns into water vapor and rises in to the atmosphere to create clouds. These are called cumulus clouds. These clouds get together to form bigger clouds start growing vertically in the sky. They get taller and taller until they represent huge powerhouses, storing a large amount of energy. These clouds are called cumulonimbus clouds, or better known as thunderclouds.

In thunderclouds, electric charges are generated due to collision of ice particles and hail pellets due to the flow of air in the cloud. The electrical charges are distributed and roughly separated in different portions of the cloud. Negative charges tend to gather at the bottom of the cloud and positive charges move to the top of the cloud.

When these charges accumulate, the charges on the surface of the earth or water also start accumulating.

Figure 1 - Lightning strike when a lightning rod is implemented

Such a large distribution of electrical charges generates a large electrostatic field between the thundercloud and the surface of the earth. As the electrostatic field develops, an advanced discharge extends from the both the earth as well as the base of the cloud.

The electrical discharge from the thundercloud is called a stepped leader. The voltage in the stepped leader is very large (about 500,000 million volts to 1 million). As the stepped leader comes near the earth, the charges from the earth start reaching out to the stepped leader.

The electrical discharge from the ground to the stepped leader are called rising streamers. The stepped leader makes contact with the rising streamer to create a lightning strike.

Figure 2 - Stepped leaders and rising streamers

The positive charges start moving towards the cloud and the negative charges move to meet the nearest point to diffuse. This is when lightning occurs.

Additional notes:

Electrical discharges take place constantly in the cloud and with other clouds. These are called inter cloud (IC) and cloud-to-cloud (CC) lightning. When the lightning happens from cloud to earth (ground), it is called a Cloud-to-Ground (CG) lightning.
The above example is when the negative charges accumulate at the base of the cloud and form a stepped leader, and positive charges from the ground form a rising streamer, the lightning strike that occurs is called Negative Cloud-to Ground (Negative CG) lightning strike.
If the positive charges accumulate at the base of the cloud and form a stepped leader, and negative charges from the ground form a rising streamer, the lightning strike that occurs is called Positive Cloud-to-Ground (Positive CG) lightning strike.
If the discharges from the ground to cloud are stronger, a lightning strike is caused from the ground to the cloud. This is called Ground-to-Cloud (GC) lightning.

Lighting strikes can cause severe damages to human lives, buildings, property, boats and seapods. For over 200 years, the recommended method for lightning prevention is a lightning rod, also called Franklin rod, named after it's inventor, Benjamin Franklin. A lighting rod, or arrestor directs the lightning discharge to ground. The lighting rod is a metallic conductor placed at the highest point of a building or structure and connected to a copper rod buried deep in the ground. When lightning strikes, the electrostatic discharge is safely conducted from the lightning rod to ground without causing damages to buildings or structures. While the lighting rod is widely used in today's world, there have been incidents of damages to the rod and to the buildings and structures because of the intensity of lightning.

Lightning rods do not prevent lightning. They attract lightning and conduct the electrical discharge to the ground.

Lightning Dissipater

A lightning dissipater is device that does not attract a lightning strike. It prevents lighting from occurring by making a structure invisible to lightning strikes. The lightning strikes another object (like a tree) or ground and does not harm the structure.

Figure 3 - Preventing a lightning strike using a lightning dissipater

A dissipater is made up of a large number of thin, sharp structures, called dissipation terminals or spikes, placed on the highest point of the structure that needs to be protected. These spikes constantly dissipate small amounts of charges based on the charges in the atmosphere.

When a charged thundercloud approaches the dissipater, the spikes begin to dissipate small amount of the opposite charge, thereby neutralizing the area around the structure. This prevents stepped leaders from reaching down to the structure and raising streamers from the structure to the stepped leader.

The thunderclouds' stepped leaders then look for alternate routes to discharge. A lightning strike occurs away from the structure - making the structure invisible to lightning.

Example: A good analogy of how dissipation works is a heat sink that dissipates heat through sharp end points to keep an electronic circuit board safe.

Figure 4 - Heat sink installed on an electronic circuit board.

Difference between a Lightning Rod and a Lightning Dissipater

While structurally both are connected to the ground, the main difference between the 2 methods is now charges accumulate and discharge.

In a lightning rod, charges accumulate at the tip of the rod and begin to form rising streamers. This accumulation of charges attracts the charges from the thundercloud, causing a lightning strike.

In a lightning dissipater, charges do not accumulate in one area. Each spike discharges a small amount of charge. Since there is no accumulation of charge, the amount of charge needed to form a raising streamer is very low. Rising streamers are not formed. When stepped leaders descend from the base of the cloud, they do not find a rising streamer and look for alternate streamers that form away from the structure. This keeps the structure safe and makes it invisible to lightning strikes.

Structure of the Lightning Dissipater

The lightning dissipater is made up the following components.

Charge dissipation terminals (spikes)
Spike Base
Spike Ball
Dissipater Mast (dissipation rod)

Charge Dissipater Terminals or Spikes

Charge dissipater terminals, or Spikes are made up of thin aluminum or steel wires. The are 12 inches in length.

Spike Base

A spike base is a circular metallic that holds the spikes together. The tube is perforated and the spikes pass through the perforations on either side of the spike base.

The base has a diameter of 2 feet and is made of the metallic rod that is 1 inch thick. the circular base is held together by 2 solid rods that are mounted on the dissipation mast.

Figure 5 - Top view of the spike base

Figure 6 - Side view of the spike base

Figure 7 - Cross section view of the spikes inserted into the spike base.

Spike Ball

The spike ball is a metallic sphere made of steel or aluminum. Its surface is perforated with slots to plant spikes. Each slot holds 100 dissipater spikes.

Figure 7 - Side view of the spike ball

Dissipation Mast (Dissipation Rod)

The dissipation rod is made of steel or aluminum and connected to ground using lightning cables and a grounding rod.

The following is a schematic diagram of the lightning dissipater.

Figure 8 - Schematic diagram of the complete setup

Further Suggested Reading

Lightning Sensors

It is recommended that each structure installs a lightning sensor to get early warning on approaching thunder clouds.

Here is some information on a potential system that does lightning prevention: https://www.mto.com.tr/mto-info and more below:

Some more general information (video)

Lightning Dissipaters are devices that can prevent lightning from striking a structure - as against Franklin rods that absorb the lighting and route it to ground.

Details to follow.

Area that can be covered = (Height of seapod + height of dissipater) * 1.25.

Dimensions - 1.25 x of the area to be protected.

Dissipater top view