Improved lightning protection in less space
September 2001
Electrical Power & Protection
The new DEHNventil is a combined Class I lightning current arrester and Class II surge arrester in one compact unit requiring only 30% of the space of similar devices. No de-coupling coils are necessary as the complete unit can easily be installed in different types of power supply systems. Previously, up to 20 devices had to be installed and connected to provide the same level of protection.
By using the encapsulated spark gap technology, safety distances to adjacent components within the distribution cabinet are unnecessary. Even at fault currents up to 25 kA r.m.s., a 35 A fuse will not trip when DEHNventil extinguishes the follow-on current.
The device makes calculations unnecessary. Its discharge capability meets level 1 of IEC, EN and VDE standards, the highest requirements of lightning protection at present. It is capable of protecting equipment, even in the case of a lightning strike with an intensity of 200 000 A (10/350).
The combined current and surge arrester has no leakage current, which allows direct use of the device upstream of the meter, and when testing the insulation, no disconnection is required. It is compatible with other surge arresters in the DEHN RED/LINE family, as well as with the Un = 230 V terminal input.
By using the twin terminals, connection is easy, and no additional terminal blocks are required for load currents equal to or less than 125 A. An additional bus bar terminal at the output increases the combination possibilities with other DIN-rail-mounted components. LED indication is provided, or if required, the optional DEHNsignal DV remote monitoring module informs the users on the state of the protection - even when they are not on site.
All DEHNventil devices have an additional earth terminal. This allows a safe connection to the main earth bus bar as well as short connection to the protective conductor of the power supply system. DEHN is represented locally by Surge Technology.
Surge Technology
(011) 792 1303
info@surgetek.co.za
www.surgetek.co.za
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