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Gas Discharge Tube Arresters (GDT)

Gas Discharge Tube (GDT) arresters are components used in power systems to protect against high voltages, such as lightning and power system switching surges. GDT arresters bring down the peak voltage on power lines to a safe level. GDT arresters are effective against all types of transients that occur in an electrical system.

GDT arresters work in high frequency applications because they have a much faster reaction time than conventional devices. GDTs also offer a more reliable protection, since they are immune to most environmental influences. GDTs also have the advantage of lower losses and higher power handling capacity, making them more suited for power systems.

GDTs are typically used in high-voltage power lines, switchgear, and substations. GDTs work by providing a Path of Least Resistance (POLR) for the high voltage, thus allowing it to travel down the arrester without causing a hazard to the power line system. GDTs also provide short-circuit protection and over-voltage protection. When GDTs are exposed to a high voltage, the gas inside the tube is ionized, allowing electrons to flow freely. This ionization of the gas creates a current path that diverts the high voltage away from vulnerable components. GDTs are typically designed to handle over-voltage levels up to 20 kilovolts (kV).

GDTs are capable of not only handling large surge currents, but also “shunting” them. This involves dissipating the energy of the surge current by changing the voltage and current through the arrester. GDTs are designed to shun the voltage peak of a lightning impulse, thus preventing damage to any connected equipment. The shunting ability of GDTs requires considerable capacity, so they are typically made from more expensive materials to achieve the highest possible rating.

GDTs are also used in radio and television transmitters and receivers, as well as other high frequency applications. In these applications, GDTs are used to provide a low-impedance path for high frequency signals. GDTs are also used to provide a path for low frequency signals. For radio and television transmitters, GDTs provide protection from electric and magnetic fields that can interfere with the transmission. GDTs are also used in high speed data communications systems to provide protection from both noise and electromagnetic interference.

With the increasing reliance on electronic systems, GDTs are becoming increasingly more important components in electrical power systems and high frequency applications. GDTs are reliable, fast and effective components that provide protection and proper operation for power types of electronic systems. GDTs can be used to appropriately limit the peak voltage and diverting the electricity away from vulnerable components, thus preventing large-scale damage.

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