05.11.14 , , ,
Photovoltaic energy systems (solar panels) continue to pick up stream and are used everywhere: for single-family houses, for shopping centers and office buildings. For example, in Australia, it was offered to "cover" old buildings with solar panels at the reconstruction and repair. And scientists from Japan are developing an orbital solar power station to reduce prices for energy carriers.
Photovoltaic power plants (including solar panels) are subject to environmental influences such as sun, wind, rain, and, of course, lightning. Occupying large areas and being, as a rule, at the level above the buildings and structures, they simply cannot "accept" a lightning strike on themselves.
Undoubtedly, the projects described above require huge money and labour investments for the safety of structures and efficiency of the systems themselves. But what should ordinary users who use solar panels do, for example for the energy supply of a cottage or container type store? How to prevent or reduce possible damage to the photovoltaic power plants from the insidious elements?
Modern manufacturers offer a variety of devices for the protection of the existing lectrical installations, including solar batteries. In addition to the installation of external lightning protection system (lightning rods and down conductors), it is also necessary to take care of the effects of lightning strikes and surges. To protect sensitive converters of photovoltaic systems specialy SPDs are used. For example, DEHNguard.
Multi-pole surge arrester with a three-stage DC switching device- is a ready-to-install combined SPD of 2nd class for the use in photovoltaic installations. Thanks to the patented technology and the short-circuited device the possibility of ignition due to overload is reduced to zero.
Technical parameters:
Max. photovoltaic voltage: up to 1000 VResistance to short-circuit current: 200 A
Full lightning discharge current (8/20 ms): 40 kA
Rated discharge current (8/20 ms) [(DC / DC-) -> PE]: 12,5 kA
Max. discharge current (8/20 ms) [(DC / DC-) -> PE]: 25 kA
Voltage protection level: up to 4 kV
Voltage protection level at 5 kA: up to 3.5 kV
Response time: up to 25 ns
Operating temperatures range: from -40 to +80 C
Mounted on a DIN-rail 35 mm wide.
Read also:
- Systems of external lightning protection
- Grounding and lightning protection
- Article by Professor E.M. Bazelyan "Lightning protection of residential and public buildings - answers to frequently asked questions in the design"
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