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When it comes to gas discharge tube arresters (GDT), its application field and working principle are two very important topics. This article seeks to explain some of the features and benefits of using GDTs and how they work in order to provide protection from lightning strikes and other voltage events.

Gas discharge tube arresters (GDTs) are an electrical protection device used to protect high voltage systems from transient over-voltages or lightning strikes. GDTs use a high voltage gas-filled tube that is housed inside a ceramic or metal enclosure in order to provide protection. They are mainly used in medium and high voltage systems and also in telecommunications systems.

When a GDT is exposed to a high voltage spark, the energy from the spark causes the gas in the tube to ionize, allowing current to flow. The current is then released slowly over time. The release of the current prevents the voltage from rising too quickly, thereby stopping the spark from causing damage to the system. In addition, GDTs have the ability to return the system to its previous state after the voltage surge has been dissipated, allowing the system to operate as it should.

The working principle of a GDT is relatively simple. When the GDT is exposed to a high voltage, it will start to conduct and the current will be diverted away from the system. As the voltage drops, the GDT will return to its non-conductive state and the voltage will return to its previous state. This ensures that the system is returned to its original condition and that it is ready for use again.

For medium and high-voltage systems, GDTs may be used in both external and internal systems. For external systems, the GDTs are typically housed in a metal or ceramic enclosure in order to provide protection from the elements. In contrast, for internal systems, the GDTs are located inside the control panel of the system. Since the GDTs are used in both internal and external systems, it is important to consider the environmental conditions they are placed in. These conditions can affect the performance of the GDT and should be taken into consideration when selecting the right type of GDT for your system.

In addition to providing protection against lightning and other voltage events, GDTs also offer the benefit of surge current protection. This is accomplished by routing the surge current to the neutral point of the system, thus avoiding overloading and damage to the system components.

GDTs are also used in telecom systems, where they are used to protect against lightning and other electromagnetic disturbances. In this application, the GDTs are housed in an insulated enclosure and connected in series to each other in order to prevent downstream equipment from being damaged. This configuration reduces the risk of system damage due to lightning strikes or other voltage disturbances.

In conclusion, GDTs offer many benefits for the protection of medium and high voltage systems. Their simple working principle and ability to return the system to its original state after a voltage surge ensures that they are a reliable means of protection. They are also capable of providing surge current protection, which further increases their effectiveness. This makes GDTs a popular choice for protection from lightning and other voltage events.

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