2017-23-A-RPLF

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Gas Discharge tube (GDT) arresters are devices designed to protect electrical circuitry from overvoltages. They work by providing a path for electrical current to flow from a high voltage source back to ground, diverting current away from the electrical system and thus protecting it from the potentially damaging effects of lightning strikes or other forms of electrical disturbances.

Gas Discharge Tubes (GDTs) employ a gas-filled tube in their construction. This tube contains a gap between two metal electrodes. Under normal operating conditions, current does not flow through the tube because the voltage across the electrodes is too low, however when the voltage across the electrodes rises above the breakdown voltage of the gas, a spark forms and current flows.

The spark that jumps across the gap follows a narrow path which has low resistance and allows current to flow. This current passes from the high voltage source to ground, diverting it away from the equipment and thus protecting it. The process is then repeated when the voltage again rises above the breakdown voltage of the tube.

Gas Discharge Tubes work in a similar way to fuses, but instead of breaking the current path they provide a low resistance path to ground in orderto divert the surge of current away from the protected equipment. This means that a GDT can be used to protect devices from the effects of high voltage spikes rather than just overcurrents. Additionally, GDTs can be designed to provide protection over a wide range of voltages, from a few hundred volts up to high levels of kilovolts.

The main advantage of using a GDT in place of a traditional surge suppressor or fuse is that it is more reliable and can provide better protection against the effects of electrical surges. GDTs are also much faster in response, meaning they can provide protection to sensitive electronics or components more quickly.

GDTs are usually connected to the electrical equipment in parallel, and they are connected in series with an external ground. This ensures that any surge in current is directed away from the equipment, and that the ground Current has the lowest resistance path. This type of protection is particularly important in applications where higher levels of surges may be encountered and where equipment needs to be protected from high voltage spikes.

The working principle of Gas Discharge Tubes is quite simple — when the voltage across the electrodes rises above the breakdown voltage of the gas, the spark jumps across the gap. This spark follows the lowest resistance path, allowing current to flow. This current creates a low resistance path to ground, diverting the surge of current away from the equipment to be protected.

Gas Discharge Tubes can be used in a variety of applications, ranging from telecommunications and power systems to lightning-protection for buildings. Their ability to quickly protect against high-voltage surges or spikes makes them increasingly popular in electronic and industrial applications.

Due to their speed of response and reliability, GDTs are often the preferred choice for applications with high levels of surges or noise, including telecommunications, power systems, and industrial control.

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