2027-42-SMLF

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2027-42-SMLF Application Field and Working Principle of Gas Discharge Tube Arresters (GDT)

The 2027-42-SMLF gas discharge tube arrester, abbreviated as GDT, is a specialized device of an electrical power system protection network for synchronous protection. Mainly applicable to various extended external wiring networks, etc., its purpose is to protect the transmission line from lightning strike, and thus protecting all the devices like switchgear, generators and transformers which are associated to it. In this article, we will introduce the 2027-42-SMLF GDT’s application field and working principle.

1. Application Field

2027-42-SMLF gas discharge tube arresters are most commonly used in electrical power system as a power surge protective device, and protect the circuit from over-voltage, especially the lightning strikes. They are usually installed at places close to the source of lightning voltage. GDT are also used to protect equipment and components on various long-distance communication lines and in computer, micro-processing, and communication systems. As both GDT and three-phase lightning arrester (TLA) can be used in substations and transmission lines, but GDT has the advantage of being compact, lightweight, and low cost, which is suitable for equipment protection. In addition, its low self-resonant frequency is better at protecting high frequency components and relay coils from lightning strikes compared with TLA.

2. Working Principle of GDT

GDT consists of a spark gap and a gas discharge tube. The two parts are connected together and have an identical voltage characteristic curve, as they share one common electrode. The spark gap and the gas discharge tube can be divided into two parts by one common electrode, namely a spark gap side and a gas discharge tube side. The spark gap will be isolated from each other under normal operating voltage. When the voltage reaches a certain value, the spark gap will break down and connected with the current conduction. At its breakdown voltage, the thermionic effect of the spark gap will generate a spark, thus leading to the conduction of high current. The spark of the spark gap will also change the gas properties of the gas discharge tube side. Through an abrupt reduction of electric resistance of the gas discharge tube and further forming a conductive channel, again resulting in a conduction of current.

When the high current flows, the high voltage in the electric transmission line is decreased, thus protecting the associated ground equipment.

The GDT is an over-voltage protective device, which will break down when the voltage reaches a certain value, but would be restored to its original state after the voltage decreases. Thus, the GDT can protect the system from the irregularity of power voltage, such as the instability of residential electricity distribution system. However, too frequent breakdown may reduce the lifespan of the GDT, and an additional reset device or protective device may be needed for higher voltage protection.

Conclusion

This article has introduced the 2027-42-SMLF GDT with its application field and working principle. The 2027-42-SMLF gas discharge tube arrester (GDT) is a very important electrical protection device with many characteristics, such as compact, lightweight, low cost and good performance for short circuit and lightning protection. By understanding the application field and working principle of GDT, we can make better use of it and gain benefits from it.

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