Lightning is one of the strongest forces in nature and happens millions of times all over the world every year. Millions of strikes produce an enormous amount of electromagnetic energy (electricity) that causes equipment to be damaged when a lightning strike occurs on power lines, buildings, or electrical equipment and may create fire hazards. To prevent this hazard to electrical systems, engineers use a lightning arrester to protect the electrical infrastructure by providing a safe path to ground to dissipate lightning surges.
In this blog, we will explain what a lightning arrester is and how it works, as well as its different types, various applications, advantages, and why it is necessary for today’s electrical systems.
Definition of a Lightning Arrester
Lightning Arresters are devices that protect electrical equipment from high-voltage power surges caused by lightning strikes. They provide a safe method of directing excess electrical energy from electrical equipment to earth using an earthing system.
Normally, a lightning arrestor is not used or interferes with the electrical current. When there is a lightning strike, the electrical surge causes many voltages to enter the lightning arrestor, which works as a safety valve to protect electrical systems from high voltage surge currents.
The lightning arrestor protects electronic systems from the disastrous amounts of energy produced by lightning.
Lightning hazards that can cause problems include:
- Damage to electrical equipment
- Loss of power
- Fire hazards from overheating
- Failure of communication systems
- Data loss from electronic devices
- High repair and maintenance costs.
Lightning can disrupt operations in commercial and industrial buildings by causing damage that results in significant financial loss; therefore, a lightning protection system is very important.
How Does a Lightning Rod Work?
The basic principle of the operation of the lightning protection device is very simple and very efficient. Its primary function is to divert currents from surge protection devices away from electrical appliances and therefore safely to earth.
For Example:
- Lightning Strikes A Building
The first example would be lightning striking a power line, tower or building; the electrical energy created in a lightning strike will be transmitted through the power grid.
- Surge is Transmitted Through the System
The electrical surge then rapidly travels through the electrical wiring to the connected electrical appliances.
- Lightning Feedback Recognises an Excess Voltage Condition
When the voltage at the device exceeds the maximum value, the lightning arrestor quickly activates.
- Lightning Arrestor Creates a Low-Resistance Pathway for the Surge To Be Guided Away
The lightning arrestor provides a low-resistance pathway for the surge current flow, which directs it to the grounding system.
- Excess Voltage Energy is Released to the Ground
The excess energy of the lightning surge current is harmlessly released into the earth via the grounding of the electrical equipment.
As lightning strikes have been captured by a lightning protection system, and a surge race and dissipated, the lightning protection system will become normal for future use of the device and safe for its respective use in the electrical system again.
High-voltage lightning arrester
Lightning Protection System Components
There are four major components in the function of a lightning protection system.
- Connection Terminals
The connection terminal connects the lightning protection system to the electrical line. The connection terminal allows surge current to enter the device.
- Insulating Shell
The insulating shell protects all internal components from environmental conditions such as moisture, debris, pollution, and heat.
- Nonlinear Resistors
The nonlinear resistors control the flow of surge current and safely redirect excess surges to the ground through the installation of an earth.
- Grounding System
A grounding system provides the path for surge current to safely discharge into the earth.
Without a proper grounding system, the lightning protection system will not do its job.
- Metal Oxide Lightning Protection System
Aluminium oxide lightning protection systems are the highest technology and volume used in the industry today.
It uses metal oxide varistors that respond very quickly to voltage surges. These arresters provide excellent protection and require very little maintenance.
They are commonly used in:
- Power substations
- Transmission lines
- Industrial electrical systems
Applications of Lightning Arresters
Lightning arresters are used in many different industries and electrical systems.
- Power Distribution & Transmission
Thunderstorm activity presents a risk to electrical transmission facilities, power lines, and electrical equipment in general. Lightning strike risks should be monitored closely.
Transformers, substations, and transmission lines rely on lightning arresters to protect them against lightning surge voltages.
- Industrial Facilities
Certain facilities, such as factories and other manufacturing facilities, utilise lightning arresters to protect electrical equipment and also equipment that uses heavy machinery.
Lightning protection is important because the cost of the equipment used in an industrial facility is very high.
- Telecommunication Towers
They are typically located in open areas and are likely to sustain a direct lightning strike.
Lightning arresters help to protect the electrical and computer equipment associated with communication facilities from lightning- induced voltage surges.
- Commercial Buildings
Office buildings, retail shopping centres, hospitals, and hotels install their own lightning protection systems to ensure they have a safe working environment and to prevent any potential electrical failure.
- Residential Buildings
Homes can also benefit from lightning protection systems because they will protect many of the appliances in your home, such as televisions, refrigerators, computers and air conditioning units from electrical surges.
- Renewable Energy Systems
Lightning arresters are critical to the safe and reliable operation of renewable energy systems, such as wind turbines, solar power systems and other renewable energy systems.
If lightning strikes renewable energy equipment, there is a risk that the equipment will be damaged.
Benefits of Lightning Arresters
The installation of a lightning arrester should offer many benefits, such as:
- Protection of Electrical Equipment
A lightning arrester will safeguard the following from lightning high voltage surge damage:
- Transformers
- Generators
- Cable assemblies
- Electrical panels
- Improved Electrical Safety
Lightning Arresters are vital to preventing many random fire and electrical accident potential incidents that may occur because of the lightning surge voltage effect on this electrical equipment.
- Lower Maintenance Costs
By providing equipment protection from damage, lightning arresters will help reduce overall repair and replacement expenses.
- Ensures Reliable Power Supply
Lightning protection helps provide a continuous power supply, regardless of the weather or storm activity.
- Long Service Life
Modern lightning arresters have been manufactured to provide extended service life with little or no maintenance.
Requirement for Adequate Earthing
For lightning arresters to operate efficiently, they must always be installed with a proper earthing system; this allows the surge current to be dissipated through a proper pathway to ground.
If the grounding system has high resistance, the lightning current will not dissipate efficiently; hence, there is a possibility that lightning may damage electrical equipment.
Accordingly, lightning arresters should always be installed with either a copper or chemical grounding system.
Grounding is crucial to protecting electrical systems and their users.
Lightning Arrester
Maintaining Lightning Arresters
Although lightning arresters are long-lasting devices, periodic inspections or maintenance are suggested.
Some examples of maintenance are:
- Checking physical conditions
- Inspecting for good grounding connections
- Testing for insulation resistance
- Measuring ground resistance
Performing scheduled maintenance allows lightning arrestors to remain effective at delivering reliable protection against surges.
Growing Demand for Lightning Protection
As industries continue to depend on electrical and electronic devices, the need for lightning protection will increase forever.
Lightning can cause voltage surges across power lines and telecommunications lines, often damaging sensitive electronic components in computers, production systems, and telecommunication systems.
With the further development of renewable energy systems and more intelligent electrical grids, lightning arrestors will continue to provide vital protection to the electrical grid.
In Conclusion
One of the most destructive aspects of nature is lightning. If lightning strikes an electrical system without enough protection, it can cause major damage. One of the primary components of every electrical system is the Lightning Arrester, which is designed to redirect any surge current safely to ground.
Whether you’re dealing with power distribution systems, industrial facilities, or commercial buildings, there are dependable, consistent methods to protect yourself from surges due to lightning with Lightning Arrestors.
By properly installing a high-quality lightning protection system and performing frequent inspections of the earthing, you can protect your valuable electrical equipment, increase the reliability of your electrical system, and create a safer environment for everyone involved in severe weather.
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About Kasaku Electricals Pvt. Ltd.
Kasaku Electricals Private Limited is a trusted manufacturer of advanced electrical earthing and lightning protection solutions. Established in 2005, the company focuses on delivering durable, conductive, and corrosion-resistant grounding systems.
With strong technical expertise and a commitment to innovation, Kasaku Electricals provides reliable and cost-effective earthing products for industries, commercial facilities, and government projects.