Solar energy

Lightning protection for photovoltaic systems

lightning

Through some of the technologies, lightning damage can be prevented.

Lightning can damage wind and solar power systems.

Through the occurrence of a large and harmful increase due to lightning, which may afflict and damage many parts of the system.

However, lightning damage can be prevented. Through some of the technologies that are most cost-effective and that are generally accepted by the regulations of building energy systems, grounding is the primary technology to protect from lightning damage. You can’t stop a lightning flash but you can give it a direct path to the ground that exceeds your valuable equipment and safely guide a lightning flash to the ground. Firstly avoid damaging this lightning.

Lightning conductors and lightning flash protectors are designed by absorbing large electrical charges to protect the electronic equipment. Lightning conductors are however not a substitute for good grounding. Instead, it works alongside grounding. The grounding system is an important part of the wired infrastructure which is installed before or during electrical wiring installation.


The first step in grounding is to build a wiring path to the ground by bonding all of the components to metal structures and electrical accessories such as photovoltaic frames, electrical fitting racks, and wind generator towers.

Work is carried out according to the global electrical connectivity controls and standards in terms of the sizes of wires, materials, and compatible technologies according to these controls. Avoid sharp bends in the ground wires. High momentary storms do not respond to the rotation of narrow corners and can easily cross into the adjacent wires. Pay particular attention to copper wire connections with attachments Aluminum frame (especially for PV panels). « AL / CU » connectors and stainless steel fasteners must be used, which reduces the possibility of corrosion. In addition, ground wires are also connected to the grounding system for both DC and AC circuits according to applicable international standards.

The weakest link in the systems is their connection to the ground itself. You cannot just connect a wire to the ground only. A rod of non-corrosive conductive metal (generally made of copper) must be buried in the ground, and it is ensured that most of its surface area comes into contact with a conductor that is wet in Earth In this way, when static electricity discharges or current rises, its charge can be discharged to Earth with minimal resistance.


The process is a method of how the drainage field dissipates the water so that the grounding dissipates the electrons and if the drainage tube is not adequately cleared in the ground, then there will be a non-rapid discharge. This causes the electrons to move backward and it will jump into the voids to form an electrical arc into the system’s energy wires, together into the system’s equipment and then the discharge to the ground.


To prevent this, copper-plated floor bars are installed 8 feet (2.4 m) long, 5/8 inches (16 mm) or more, preferably in wet ground. And usually, one rod is not enough, especially in dry ground. In areas where the ground is very dry, several bars must be installed, spaced at least 6 feet (3 meters) apart from each other, and bound together with bare copper wire and buried.

Or an alternative method is to bury a 6-inch wire, an 8-inch double wire, or larger than the bare copper wire in a trench that is at least 100 feet (30 m) long. (It can also make use of bare copper ground wires along the bottom of a trench carrying freshwater, sewage pipes or other electrical wires.) Or cut the ground wires in half and spread them in two directions. One end of each buried wire is connected to the grounding system.

In humid places, grounding is ideal, these sites will not need to provide the concrete ends of a matrix installed on the ground or mounted on a pole or wind generator tower or ground rods encapsulated in concrete, concrete is usually less connected than the wet soil surrounding the pole.

If this is the case for you, install a ground bar in the ground next to the concrete at the base of the matrix or at the base of the wind generator tower, and then it is all connected with the buried bare wires.


In dry or arid climates the opposite is often true. Concrete foundations may have a higher moisture content than the surrounding soil and provide a more economical opportunity for grounding.

 If the 20-foot (or longer) rebar is included in the concrete, the armature itself can act as a ground rod. (Note: this should be planned prior to pouring concrete.) This grounding method is common in dry places

When connecting the wires, it requires connecting one end to the DC power system and connecting it to the ground. The part of the alternating current in such a system must also be grounded by the traditional method of any network-connected system. Earthing the energy system is required, especially in modern home systems.

Matrix wires should use minimum wire lengths and be installed in the metal frame.
The positive and negative wires must be equal in length and rotated together whenever possible. This will reduce the inductance of the excessive voltage between connections. (Grounded) metal connections also add a layer of protection. Wires are buried for long external energy instead of passing over the system. A wire that is 100 feet (30 meters) or more is similar to the antenna in the air and will receive exposure even from lightning in the clouds. Similar electrical shocks can still occur even if the wires are buried, but in most installations, the power transfer wires must be Buried, it further reduces the possibility of damage from lightning.

Lightning rods are stationary discharge equipment placed over buildings and solar electrical arrays, that are connected to the ground and are intended to prevent the accumulation of constant charge and ionization of the surrounding atmosphere. It can help prevent electric shock and it provides a path for very high current in the event of the shock and modern devices are in the form of alloys and often contain multiple points that are a path for electric charges.

Lightning rods are usually used only in locations with severe electrical storms. And if you think your site falls into this category, lightning protection is essential. If your system installation structure is not very suitable, consider consulting a lightning protection specialist before installing the system if possible.




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