2026-09-C13

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Gas Discharge Tube Arresters (GDT) are electronic devices used to protect equipment from overvoltage. The technology can be applied in many fields such as power generation, transmission and distribution, communications, and railroads. GDTs can be used for both surge and AC line protection.

The general working principle of GDT is based on the inception of an arc between two electrodes. It involves a charged tube which is made of metal glass. Inside the tube, two electrodes (anode and cathode) are placed in an atmosphere of insulating gas. The type of gas used depends on the application. Argon is used for inert gas applications while sulfur hexafluoride (SF6) is usually used for high voltage applications. The current flows between the two electrodes when an external voltage is applied and the tube acts as a surge limiter.

GDT can be used in a variety of applications such as overvoltage protection, lightning protection, communication and data network protection, and automotive applications. In overvoltage protection, GDT provides a safeguard against surges caused by accidental or natural sources. It is a preferable technology for surge protection devices (SPDs) as it works in a more stable way than other technologies, and it is not prone to degradation over time.

GDTs are also used in communication and data network protection applications as they provide reliable protection against fast electrical transients. It effectively limits the surge energy that might be transferred between the transmitters and the receivers. In addition, GDTs can be used for lightning protection as they detect lightning current and divert it away from the connected systems. This helps to prevent the destruction of the connected systems due to the high energy of the lightning. Automotive applications are also being developed that use GDT to protect electronic control units (ECUs) from overvoltage.

Thus, it can be seen that GDT provides reliable protection against surges and transients for a wide range of applications. It is a robust, reliable, and cost-effective technology which provides protection against overvoltages and lightning. Moreover, it is suitable for residential and commercial applications and provides improved safety for users. Therefore, GDTs are essential for safeguarding against overvoltages and lightning, and they are used widely in different industries.

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