2017-09-SMC-RPLF

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Gas Discharge Tube Arresters (GDT) are used to protect electrical equipment from external electric surge events that might occur. These GDT protectors are designed to stop electrical surges that may be caused by lightning, power surges, or other sources.

A GDT can be used in a variety of applications, such as in telecommunications, television broadcasting, and internet data transmission. GDTs may be used in energy distribution systems, power lines, and even solar cells. GDTs are also used for the protection of critical electronic devices in industrial settings, such as control systems.

Gas Discharge Tube Arresters (GDT) typically consist of two electrodes connected in series. The main electrode is a voltage breakdown tube filled with neutral gas, and the second electrode is the anode electrode. When exposed to a voltage that exceeds the insulation level of the device, the electron field in the gas will breakdown, generating a spark. The spark then removes the excessive voltage between the two electrodes, thus limiting the voltage received.

The neutral gas inside the GDT plays an important role in providing the energy necessary for the spark to break down the breakdown voltage. Different gases can be used, with sulfur hexafluoride (SF6) and dry air being the most common. The gas is selected according to the application and the operating voltages. SF6 is generally preferred for high voltages, while dry air is preferred for lower applications.

The working principle of Gas Discharge Tube Arresters (GDT) can be illustrated using the simplest example of a two-electrode GDT circuit, as shown in the figure below. The first electrode A is the anode, which is connected to the AC power source, while the second electrode B is the cathode, which is connected to the ground. When a voltage greater than the breakdown voltage of the gas is applied between the electrodes, electrons in the gas break down and begin to create a spark. The spark removes the excess charge and removes any potential damage to the system.

In a two-electrode GDT, the gap between the electrodes should not be too large because larger gaps result in increased breakdown voltages. Furthermore, the electrodes should be well insulated to avoid any shorts occurring in the gas. GDTs rated for high voltages usually have multiple gas-filled electrodes to help increase the breakdown voltage.

Gas Discharge Tube Arresters (GDT) are commonly used in outdoor telecommunications systems as lightning protectors to reduce damage from electric surges. They are also used in power plants, industrial equipment, and even home appliances. GDTs are reliable, durable, and cost-effective devices that can provide effective protection from electric surge events.

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