2015-23-SMC-RPLF

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Gas Discharge Tube (GDT) Arresters have been used in various applications since the early 1900s, providing power system protection from over-voltage transients. GDT Arresters, or GDTs, are devices made up of a hermetically sealed glass tube containing two electrodes, a spark gap, and a dielectric medium. Depending on the specific application, GDTs can be divided into two major categories: non-sag and sag AR-based GDTs. The former is suitable for applications where the arrester should sustain no voltage during normal operation, whereas the latter is a limiting type arrester, meaning it will maintain some residual voltage even during normal operations.

Non-sag GDTs are particularly useful for applications requiring fast response protection from short-term, large energy surges. Such applications include motor installations, transducers, and control operated switches. They are also commonly used in power distribution and telecommunications systems as a way of providing instantaneous over-voltage protection. Non-sag GDTs typically operate by diverting the surge into the ground through the spark gap when an over-voltage is detected, thus preventing any secondary damage from the surge.

Sag AR-Based GDTs are constructed in a similar way as non-sag GDTs, but they also contain a resistor for limiting the discharge current. This makes sag AR-based GDTs best suited for applications where protection from high current surges is needed, such as lightning strikes or direct strikes to the power lines. As the surge current passes through the arrestor, the resistor dissipates the surge energy gradually, thereby reducing the risk of secondary damages.

The working principle of both non-sag and sag GDTs is based on the fact that during a surge, a spark gap rises above the reference voltage. As the spark gap opens, a path for the current to flow to ground is created, enabling the arrester to provide lightning protection. The spark gap is then closed as the surge voltage drops below the reference voltage, restoring the system to its normal operation.

In addition to providing surge protection, GDT arresters can also be used in RF filtering applications. GDTs are especially useful in RF filtering, as they are able to attenuate the high frequency harmonics caused by switching transients. They are also useful in preventing any RF interference from entering the power system by filtering them out.

GDT Arresters have become an important part of the modern power system due to its reliability and effectiveness. GDTs are used in a wide variety of power system applications, ranging from motor installations to lightning protection systems. With its low cost and ease of installation, GDT Arresters have become a cost-effective and reliable choice for protection against electrical surges.

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