Gas discharge tube surge arresters
March 2013
Electrical Power & Protection
DEHN’s DEHNgate is a family of lightning current surge arresters with a cable adaptor design for protecting coaxial systems such as CCTV, mobile radio stations, cell sites and antenna systems. Different mechanical and electrical types are available according to the application. The coaxial DGA arrester family has a range of plugs and arrester technologies allowing for optimised solutions.
The 1/4 wave type DGA L4 surge arresters provide an internal coaxial connection of the inner conductor as a band-pass. Only frequencies within this band are transmitted. For low-frequency impulses such as lightning currents they form a short circuit. This makes them mechanically robust and maintenance-free. Due to their low protection levels and high discharge capacity, they can be used as combined lightning current and surge arresters.
Type DGA FF TV arrestors can be mounted on DIN rails in a space-saving way for protecting satellite systems with several outputs. For single applications such as cable TV, the wall-mounting adaptor can be used. Two F-cable connectors are also included.
If high partial lightning currents can potentially couple into antenna lines or if very high transmission performances are required, 1/4 wave surge arresters provide the best protection. If an additional remote supply is needed for the antenna, a combination of a gas discharge tube and 1/4 wave technology (DGA LG) should be used. The surge arresters are made of top quality material and provide excellent endurance.
Spark-gap based surge arresters have an internal gas-filled surge arrester and can be defined as low pass. This also allows for DC transmission (antenna supply). Peak voltages exceeding the threshold value of the gas discharge tube are discharged.
These surge arresters provide extensive contact surfaces from the inner conductor to the gas discharge tube. This minimises burn-off of material during the discharge and ensures a constant transmission performance.
For more information contact Paul van As, Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za
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