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Gas Discharge Tube Arresters (GDT) are electronic components which guard against surges and transients, such as RF energy, lightning strikes, and switching transients. Also known as Spark Gap Arresters, GDTs are used in a variety of applications, including power transmission lines, commercial/industrial power circuits, automotive power systems, telecommunications systems, computer networks, and aircraft. The following outlines the application field and working principle of the GDT.

Application Field of GDT

GDTs are used in a variety of applications, including:

• Power transmission lines: GDTs are commonly used in power transmission lines to protect against high-energy surges and transients.
• Commercial/industrial power circuits: GDTs are also used to protect circuits from power surges and transients that can cause the circuit to fail.
• Automotive power systems: GDTs are commonly used in automotive power systems to protect the electronics from failure.
• Telecommunications systems: GDTs are used in telecommunications systems to protect the circuit from surges and transients.
• Computer networks: GDTs are used in computer networks to protect the circuitry from short circuits.
• Aircraft: GDTs are used to protect the aircraft\'s electronic systems from power surges and transients.

Working Principle of GDT

GDTs are composed of a metal oxide varistor (MOV) and a gas discharge tube (GDT). A GDT is a special type of tube that is filled with a gas, usually Nitrogen. The two electrodes inside the tube are connected to the external circuitry. When there is a surge or transient, the MOV absorbs the energy and the GDT conducts the energy to ground. The MOV absorbs the energy up to a certain point, at which point it triggers the GDT to conduct the energy to ground.

The gas inside the GDT is ionized when is it exposed to the high voltage surge, which causes current to flow from one electrode to the other. This conducts the energy away from the sensitive circuitry, thereby protecting it from damage. After the energy is discharged, the gas reverts back to its non-conductive state, allowing the MOV to start absorbing the energy again.

Conclusion

Gas discharge tube arresters (GDTs) are used to protect sensitive electronics from high-energy transients and surges. GDTs are commonly used in power transmission lines, commercial/industrial power circuits, automotive power systems, telecommunications systems, computer networks, and aircraft. GDTs are composed of a metal oxide varistor (MOV) and a gas discharge tube (GDT). When a surge or transient occurs, the MOV absorbs the energy and the GDT conducts the energy to ground. The gas inside the GDT is ionized when is it exposed to the high voltage surge, which conducts the energy away from the sensitive circuitry, protecting it from damage.

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