Professional lightning protection systems using varistors
by C Plattmann, Phoenix Contact
Electricity+Control, August 2014 (pages 16 – 18)
Enquiries: Tony Rayner. Phoenix Contact South Africa.
Download the full article on Professional lightning protection systems using varistors in PDF format.
Varistor-based Type 1 surge voltage devices can, as a result of their narrow design, be professionally installed in areas where space is restricted. They meet all of the requirements laid down in the product standard - for instance, an integrated disconnect device for all of the protective elements and optical and electrical signalling of the function status.
DIN EN 62305-3  specifies that lightning protection systems must be checked on a regular basis. This check not only involves the external lightning protection system, but also the internal one. When performing such a check and for the regular insulation checks specified, it is advantageous if all the active elements – including the protective plugs of the surge protection devices – can be checked using a special instrument without interrupting operation and without intervening in the installation itself. A checking devices documents the results of the check as laid down in the lightning protection standard.
After the check has been completed, protective elements that are outside the tolerance limit are replaced by new ones. The elements that lie within the specified tolerance are reinstalled in the base element.
In addition to the well-proven Type I surge protection devices based on the spark-gap principle, users can now also use varistor-based Type 1 devices. Type I surge protection devices with this design fulfill all of the requirements of the relevant regulations and directives. They can be professionally and cost-effectively integrated into almost any lightning protection system.
- Varistor-based Type 1 surge voltage devices can, as a result of their narrow design, be professionally installed in areas where space is restricted.
- Varistor-based Type 1 surge voltage devices meet all of the requirements laid down in the product standard.
- Varistor-based Type 1 surge protection devices can be used in addition to the Type 1 surge protection devices based on the spark-gap principle.