Lightning Protection Systems in Industrial and Commercial Infrastructure

Lightning is a powerful atmospheric discharge of electricity that occurs during thunderstorms. With speeds comparable to the speed of light and temperatures reaching up to 30,000°C, lightning poses serious risks to life and infrastructure. Each year, lightning strikes cause thousands of fatalities and immense damage to electrical systems, buildings, and industrial plants.

Lightning protection systems are crucial for safeguarding industrial buildings, food processing factories, HT substations, electrical panels, and commercial infrastructures. A direct lightning strike can deliver currents of tens of kilo-amperes within milliseconds, resulting in:

• Equipment failure
• Structural fires
• Power outages
• Risk to human life

Components of lightning protection devices

Air terminal

The air terminal intercepts lightning strikes by providing a low-resistance path. It connects to a down conductor, which further connects to an earthing electrode embedded in the soil. This system ensures the electrical discharge flows directly into the earth rather than through the building structure.

Down conductor

The down conductor carries the intercepted current safely to the ground. To maintain low inductance, the conductor must be:

• Installed vertically and straight
• Free from sharp bends
• Sized appropriately to handle high surge currents

Grounding

Proper grounding is the backbone of any effective lightning protection setup. According to standard electrical practices:

• Soil resistivity should be below 10 ohms
• Copper alloy electrodes are driven vertically into the earth
• Charcoal and salt are mixed into the soil pit to reduce resistivity

Lightning Arrestor

Lightning arrestors are specially designed devices that protect:

• Transmission lines
• Switchgears
• Transformers
• Telecommunication systems

They function by diverting surge voltage directly to the earth grounding system, preventing spikes from reaching sensitive electrical equipment.

Applications:

• Installed at power substations and distribution systems
• Placed at building entry points in telecom setups
• Prevent damage to industrial automation systems and food control instrumentation

Small version of light arrestor is called surge arrestor. That are generally used for protection from surges produced in transient condition and they are not used directly to protect from lightning. The most common surge arrestor is non linear metal oxide resistor type in porcelin or silicon rubber housing that are fitted parellel to circuit and connected to earth griding.

Types of Lightening Arrestors

Conclusion

Whether you're designing a food processing facility, installing electrical systems, or managing project safety protocols, integrating lightning and surge protection is non-negotiable. The right class of lightning arrestor, its location, and grounding effectiveness play a vital role in safeguarding assets and ensuring operational continuity.

For high-risk environments like food factories, HT substations, and engineering control rooms, always consult with a food industry consultant or electrical systems expert to ensure compliance with industry standards.

References

1.https://www.electricaltechnology.org/2020/03/surge-arrester-suppressor-lightning-arrester-rod.html