The gas discharge tube (GDT) is the only surge protection component usable on very high frequency transmission (several GHz) due to its very low capacitance. In a coaxial surge protector, the GDT is connected in parallel between the central conductor and the external shield. When its sparkover voltage is reached, during an overvoltage event, the line is briefly shorted (arc voltage).
The sparkover voltage depends on the rise front of the overvoltage. The higher the dV/dt of the overvoltage, the higher the sparkover voltage of the surge protector is.
When the overvoltage disappears, the gas discharge tube returns to its original condition of high isolation and is ready to operate again. The gas tube is removable, making maintenance rapid in the end-oflife scenario (short-circuit).
ELECTRICAL PROPERTIES
MECHANICAL PROPERTIES
NORMS
The efficiency of coaxial protectors is highly dependent on proper installation, in particular their connection to the earthing network of the installation.
The following installations rules must be strictly observed to ensure the efficiency:
The «feedthrough mounting» versions perfectly meet all these requirements.
Warning: Carefully remove all paintings or insulating coatings to ensure good contact..