lightning and surge protection for PV blitzschutz.de - Power Systems
More and more private and public clients such as municipalities and other public bodies decide today to make their roofs for photovoltaic plants. The importance of renewable energy sources is taken into account herewith.
Regulatory requirements demand for construction works in this sector is often a lightning protection as a preventive measure of fire protection to the sensitive technical infrastructure protect the plant. Conversely, the protective function is not an already-installed lightning protection system by the installation of a PV system affected.
particular importance is the correct choice of the lightning protection system. If possible, the lightning protection while maintaining the required separation distances have no direct connection to the PV system.
Here we have-in part-the main elements concerning the application of relevant regulations and requirements.
For use Din are the following rules and regulations:
DIN EN 62305-3 VDE 0185-305-3
Supplement 5 Supplement 5)
lightning
Part 3: Physical damage to structures and people
Supplement 5: Lightning and surge protection for PV power systems
SCOPE
This supplement deals with the protection of PV power systems against harmful effects of lightning and surges of atmospheric origin. If a flash is required and / or surge protector, or will be located, describes the supplement requirements and measures to ensure the safety, performance and availability of PV power systems to obtain.
RISK
sufficient for normal requirements, a lightning protection system class III, only in special cases, such as increased availability the system can be a different lightning protection class according to EN 62305-s (VDE 0185-305-2) certified.
The lightning protection of technical measures for the PV system can be adapted and he lightning protection class of the building. LIGHTNING PROTECTION SYSTEM
The risk of lightning is not changed by the establishment of a PV system. It is recommended that the vote of the PV system with the lightning protection system. This can be kind of appropriate measures and direct lightning discharge into a grounding system to prevent galvanic currents coupled to the PV system to act. Additional measures are
internal lightning protection effects of lightning strikes and Potential differences on the building and prevented. This damage to the building (mechanical and fire damage) are, and damage to the PV power system (mains, control and electrical safety devices), prevented.
planning, installation and testing are carried out by lightning protection specialists. The requirements for a lightning protection specialist are defined in the standards DIN EN 62305 (VED 0185-305). a lightning protection specialist , who can because professional training, knowledge and experience and knowledge of relevant standards, plan, install lightning protection systems, and check.
EXTERIOR LIGHTNING
The fishing equipment be established taking into account the separation distance. This distance is maintained to avoid dangerous radio binding to parts of the PV system. Between the PV modules and metal parts, such as lightning protection system, gutters, roof window or antenna installations are to comply with DIN determined separation distances.
must be noted also the possible shading of the PV modules by arresting gear.
INNER SURGE PROTECTION
surges as a result of direct atmospheric discharge may be limited by appropriate surge protection devices (SPD Type 1 according to DIN), power surges as a result of distant lightning protection devices require the Type 2 and type 3 according to DIN EN 61643-11 (VDE 0675-6-11).
Note: The above standard applies to surge protectors for AC power systems. For overvoltage protection in DC systems currently are no normative requirements. For the selection of surge protection devices for the DC side of PV systems suitable, currently, only the relevant manufacturer's data are considered.
GROUNDING
Is the PV system within the scope of the capture device, a function of the metal grounding PV mounting rack is carried out. For this purpose, the module frames and frames are connected to the main earth bar. The conductor cross section should be at least 6 mm2 (copper) or an equivalent current carrying capacity. Similarly, all the module frame rails are interconnected with the cross-section.
Is the plant is not within the scope of catcher , so conductive fastening devices (eg, support profiles) to the main earth bar of the building to join. The cross section should be at least 16mm2 (copper) or 25mm2 (aluminum) amount. The fasteners are connected to each other as well. A conductive connection between the conductive parts of the modules is advantageous.
0 comments:
Post a Comment