Dehn’s lightning and surge arresters
June 2014
Electrical Power & Protection
DEHNgate (DGA) is a family of lightning current and surge arresters designed as a cable adaptor for protecting coaxial systems such as CCTV, mobile radio stations and antenna systems from potential damage. Hybrid filter technology ensures the device functions over a wide frequency range while offering the greatest protection levels. The coaxial DGA arrester family comes in different designs to suit a wide range of applications, with the various types of connectors and arrester technologies providing optimal solutions.
The space-saving DGA FF TV can be mounted onto a DIN rail to protect video, camera and satellite systems with several outputs and is available with direct (VCD) or indirect (VCID) shield connection to avoid ground loops. For single applications, such as broadband cable connections, the device can simply be snapped into a wall-mounted adaptor. The DGA FF TV arrester is the first of its kind to have an integrated measuring output for antenna signals, allowing the system to be easily tested.
If a DC supply is required for the antenna system, such as for a remote radio head, electrical down tilt, tower top amplifier, and so on, a hybrid arrester such as DGA LG can be used. The DGA LG utilises a hybrid quarter wave shorting stub and de-coupled gas tube to pass the required RF frequencies while allowing the DC to pass through the device. With this technology you benefit from essentially three devices in one, a bandpass filter, and lightning protection for both the RF and DC signals. Because the gas tube is de-coupled from the shorting stub, the majority of the lightning energy is diverted to ground by the stub itself, allowing the gas tube to only come into action during a direct strike. This ensures the device will remain useable and maintenance free for more than 10 years.
The arresters are manufactured of top grade materials, finished in a robust tri-metal plating, and are designed to give outstanding performance and endurance.
For more information contact Alexis Barwise, Dehn Protection Southern Africa, +27 (0)74 505 0312, [email protected], www.dehn-africa.com
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