What is lightning?

Every Year an average of 1.7 million Lightning strikes discharge over Bangladesh every year. This rate is slowly increasing every year for the global environment change. The actual lightning density, however, depends to a large extent on geographic conditions. Thunderstorms come into existence when warm air masses containing sufficient moisture are transported to great altitudes. This transport can occur in a number of ways. In the case of heat thunderstorms, the ground is heated up locally by intense insolation. The layers of air near the ground heat up and rise. For frontal thunderstorms, the invasion of a cold air front causes cooler air to be pushed below the warm air, forcing it to rise. Orographic thunderstorms are caused when warm air near the ground is lifted up as it crosses rising ground. Additional physical effects further increase the vertical upsurge of the air masses. This forms up draught channels with vertical speeds of up to 100 km/h, which create towering cumulonimbus clouds with typical heights of 5 – 12 km and diameters of 5 – 10 km. Electrostatic charge separation processes, e.g. friction and sputtering, are responsible for charging water droplets and particles of ice in the cloud. Positively charged particles accumulate in the upper part, and negatively charged particles in the lower part of the thundercloud. In addition, there is again a small positive charge center at the bottom of the cloud. This originates from the corona discharge which emanates from sharp-pointed objects on the ground underneath the thundercloud (e.g. plants, high raise Building), and is transported upwards by the wind. If the space charge densities, which happen to be present in a thundercloud, produce local field strengths of several 100 kV/m, leader discharges (leaders) are formed which initiate a lightning discharge. Cloud-to-cloud flashes result in charge neutralization between positive and negative cloud charge centers, and do not directly strike objects on the ground in the process. The lightning electromagnetic impulses (LEMP) they radiate must be taken into consideration, however, because they endanger electrical and electronic systems.  

Why LPS

Lightning protection is one of those engineering systems that is a mystery to many, and often a value engineering target for those who do not understand the purpose of a lightning protection system. The primary reason for a lightning protection system is to route that electrical energy to a less destructive path to ground instead of traveling through the building’s electrical wiring, water piping, structure, or low-voltage cabling paths where it could create significant chaos inside the building. A lightning protection system does not completely eliminate the damage that can be caused to a structure, but it can certainly decrease the damage by routing the energy directly to ground instead of giving it free reign of the building. Let say all the industrial device run at 440V. But if all of then receive a 10 million volt electrostatic discharge definitely all of them will be destroyed. So any industrial building/high raise building must have to have Lightning protection system for the safety of the building itself and all the electronics inside the buildings. So we must have to say safety first.  

System Devices

• Capture system: Device for picking up lightning.
• Down conductors: Equipment needed to conduct energy to ground in a controlled and safe fashion.
• Grounding systems: Equipment needed to dissipate lightning currents. A grounding system is essential for the proper operation of the protection system, including surge protection.
• Surge protection: Devices for protecting electrical and electronic equipment connected to the facility's electrical network or low current networks (telecom and signaling networks) against voltage surges.

 

Devices to be protected

• Human Life
• Electrical wiring
• Transformer
• Electrical Accessories
• MCB of all entry point
• Industrial Machineries
• Production Machineries
• Building Color
• Laser System
• CNC Machine
• Injection Molding Machine
• Extrusion Machine
• Color coating machine