SURGE PROTECTION SURGE PROTECTION MeR5ei\l Expertise, our source of energy W SOLUTIONS SURGE-TRAP® IEC TYPE 1, 1+2, 2, 2+3 LIGHTNING AND SURGE PROTECTI ON

• Introduction to surge protection 4 IEC 61643 Standard • Typical Current (Ityp), 7 beyond the Standard • BS 7671:2018 / 18th edition 8 • SPD placement in your design 9 • Products: Surge-Trap® Type 1+2 14 • SPD general installation features 22 2 Mersen • Surge-Trap® Solutions

Expertise in power quality Your global electrical power partner Mersen is a leading market player with innovative solutions in the field of lightning and surge protection. We design, manufacture, test and certify our products and your systems. Safety & reliability for surge protection • Bringing together the experience of the principal international manufacturing and test standards for SPDs (IEC and UL) • Unique expertise in the combination of SPD and fuse technology, one of the hot topics in the SPD industry • Innovative ranges combining surge protection and ground monitoring to provide full...

Surges are transient over voltages that can reach tens of kilovolts with durations in the order of microseconds. Despite their short duration, the high energy content can cause serious problems to equipment connected to the line like premature aging of electronic components, equipment failure or disruptions to service and financial loss. • Lightning: The most destructive source of surge. Based on the IEC 61643-12 standard, energy from lightning can reach up to 200 kA. However for reference, estimates indicate 65% are less than 20kA and 85% are less than 35kA. • Induction: Sources include cloud...

Internal sources: These are the main sources of surge in real life They come from utility grid switching, disconnection of motors or other inductive loads. Energy from these sources is also analysed with the 8/20 μs wave form. Transient overvoltages do not occur solely in power distribution lines, they are also common in any line formed by metal conductors, such as telephony, communications, measurement and data. Protector in front of surges: SPD (Surge Protection Device) A transient overvoltage protection device acts as a voltage controlled switch and is installed between the active conductors...

Up Voltage protection level Maximum residual voltage between the terminals of the protection device during the application of a peak current. In Nominal current Peak current in 8/20 |js waveform the protection device can withstand 20 times without reaching end of life. Imax Maximum discharge current Peak current with 8/20 js waveform which the protection device can withstand. Uc Maximum continuous operating Voltage Maximum effective voltage that can be applied permanently to the terminals of the protection device. Iimp Impulse current Peak current with 10/350 js waveform which the protection...

T YPICAL CU RRENT (I T YP), BE YOND THE STANDARD Typical current (Ityp); SPD performance that guarantees the surge protection in the real life Iimp, Imax and In show the one off maximum robustness of the SPDs in heavy conditions. However, most surge currents are in practice lower and repetitive because of network switching or because lightning inductions onto the power grid. The Typical Surge Current (Ityp) is the value that statistically the SPD faces in real life. The value depends on the level of exposure: The lifetime is described by the number of hits that the SPD is able to withstand at...

A step ahead for surge protection Posted 2nd July 2018 and effective from 1st January 2019, BS 7671 2018 supposes a big change for the surge protection in the UK. On one side, the 18th Edition opens the need for installing surge protection in a very broad spectrum from public, commercial or industrial activities too, even, consumer unit applications depending on the circumstances. On a second side, the 18th Edition, (based on the EN 62305-4 and EN 61643-12) describes the selection and the application of surge protection devices too. Where is surge protection required? Section 443. Protection...

(BS7671 SECTION 534.4 “SELECTION AND INSTALLATION OF SPDs” ) Which SPD has to be selected? Section 534 describes the selection and installation of SPD Where to start the protection design? At the origin of the installation, the main switchboard is the place to start the design of SPDs on the network. What is the SPD that has to be installed in the mains? As stated in section 534.4 1.1, SPD installed at the origin of the installation shall be Type 1 or Type 2. Type 1, Type 2 which one has to be selected? As previously stated, the SPD protection design does not depend on the fault ratings given...

Do we have to consider more SPDs in the distribution boards? The IEC 60634-4-443 standard classifies electrical devices in categories, depending on how sensitive they are to the surge over voltage (Ue). Category 1 devices (electronic receivers) are the most sensitive, Ue has to be at least 1.5 kV. Whereas category 4 devices can withstand 6kV or more. Generally, components in main switchboards are category 4 devices ie ACB, MCCB etc. Impulse voltage withstand Then, let's consider an example below, where a Type 1+2 SPD is installed in the main distribution board of an installation. The following...

Do we need to install a third stage of surge protection devices? A third stage of surge protection installed at the final load may be considered depending on what load it is, how critical, expensive, cost of downtime and sensitive it is. If the cost of the equipment and/or downtime is high then installing a third stage Type 3 (1.5/50μs) device will further reduce the risk of any last surge energy getting to your equipment. Examples of applications that should include a 3rd stage of surge protection are: • Hospitals • Data Centres • Airports • Banking and Insurance • Transportation

Remote indication Biconnect connection Mersen quality Dry contacts, optional in all ranges, for remote indication of protector end of life. Two types of terminal: for rigid or flexible cable and for fork type comb busbar. Product range produced entirely by Mersen, with a thermal disconnection system. Use of the best materials and components. UL 1449 4th Ed. Protector lifetime status indication Cartridge security system Clear display of protection end of life. Vibration proof according to the maximum levels specified in IEC 60721 (2M3 transport & 3M8 operation). New, optimised disconnection system...