LV Surge Arrester

LV Surge Arrester, Unfortunately, when we say lightning protection systems today, the only subject that comes to our mind is Lightning Rod Systems. Moreover, there is no standard for it in our country yet. While external lightning protection systems protect structures physically, low voltage surge arrester (Internal Lightning Protection) systems protect electrical systems and equipment. Sudden Overvoltage Protector products basically protect AC, DC, and Data lines. Besides lightning impulses, grid impulses, sudden voltage drops and rises, harmonics, and switching impulses also damage all our systems. Therefore, internal lightning protection (surge arrester) systems should be used in a cascaded manner throughout our facility.

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A lightning impulse falling on our External Lightning Protection system heads towards our facility within 25 nanoseconds, and due to resistance differences, the impulse travels over our structure’s energy and data lines. A 100-kiloampere lightning impulse may leave no system standing in our facility. Therefore, we have to use LV surge arrester products. Basically classified into 6 categories, internal lightning protection systems are divided into basic groups as Class B, Class B+C, Class D, Class C+D, Class B+C+D, and Class C. Sudden Overvoltage Protection products and Lightning Protection Boxes are selected suitable for the facility by expert engineers according to the continuous voltage of the system, the type of current passing through it, the number of phases, the ground structure, and the result of the risk analysis of the facility to be established. There is also a choice based on product technologies in LV Surge Arrester systems.

Safetec LV Surge Arrester

You can understand the patented Safetec technology much better from the image below. You can see the gas discharge tube, current limiter, and MOV. When an impulse comes, it is first dampened by the GDT. The current limiter prevents the MOV from being damaged in strong impulses. Thus, the surge arrester works healthily for a much longer time.

In LV Surge Arrester systems, gas discharge tube (GDT) technology is of great importance parallel to semiconductor technology. The most correct systems are the joint operation of these 2 systems and the circuit elements not burning due to the heat effect of the lightning impulse. The giant company of the Raycap group brought a new breath to surge arrester technology with ISKRA Safetec products. After eliminating the temperature effect of the lightning impulse reaching 28,000 Celsius with the TC circuit, it placed the GDT technology , which protects the varistors and offers an Airbag effect, as the first element to meet the system and took the varistors that react in less than 25ns under protection. In the 2nd line after this protection, a circuit structure forming the basis of Safetec technology emerged, where GDT and Varistor work like 2 different circuits and detect lightning and grid impulse characteristics separately. Especially with the PROBLOC series of Safetec technology, factories, power generation plants, solar energy projects, hospitals, and flammable/explosive facilities experience the confidence of long-term protection.

LV Surge Arrester Internal Lightning Protection

The installation of products is extremely important. While Class B and C sudden overvoltage protection products are connected in parallel to the system, Class D LV surge arresters can be connected in series to the system. Class B internal lightning protection products should be connected with a 16 mm2 cross-section cable, Class C internal lightning protection products with a 6 mm2 cross-section cable, and Class D LV surge arresters with a 1.5 mm2 cross-section cable. Protection boxes, the use of which is mandatory within the scope of the IEC 62305 Standard, are generally called panel-type lightning protectors, but as we mentioned above, internal lightning protection products provide protection not only against lightning but against all other sudden overvoltages.

Surge arrester products that ensure the lightning protection of electrical systems vary according to the system and facility structure, and the correct products must be selected with a lightning protection survey. Basically, the following solutions are created with Internal Lightning Protection products, and these solutions can be diversified greatly.

• Lightning Protection of Factories and Facilities – Industrial Facility LV Surge Arrester Systems
• Lightning Protection of Flammable and Explosive Facilities – Exproof LV Surge Arrester Systems
• Lightning Protection of Solar Systems – DC Surge Arrester
• Lightning Protection of Automation Systems – PLC Lightning Protection Systems

• Lightning Protection of Security Systems and CCTV Camera Systems – Cat and Coaxial LV Surge Arrester Systems
• Lightning Protection of Wind Turbines
• Lightning Protection of Power Plants

To be protected from Sudden Overvoltage, 4 systems must absolutely be present in your facility: External Lightning Protection – Grounding – Internal Lightning Protection and Equipotential Bonding. In this context, if you have a lightning rod system in your facility, you must definitely have internal lightning protection products cascaded in your facility against fire, electrical system safety, and all facility failures. In this context, as the expert engineer staff of the Lightning Protection Center, we can come to your facility with RayCap Internal Lightning Protection Systems – LV Surge Arrester systems, of which we are partners, perform a free lightning protection survey, and present the risk report to you. In this context, we kindly request you to contact us and specify your request for internal lightning protection – sudden overvoltage protection survey.

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