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Gas Discharge Tube Arresters (GDT) is a device used to protect an electrical system against abnormal surge voltages. It is a widely used protection device because of its excellent performance, small size and light weight. GDT works by redirecting the voltage from the power source to an alternative path that can handle the high voltage. It is based on the principle of induced voltages. When a voltage is applied to the GDT, there will be an induction field produced, which will limit the current that flows through the system. This protection is essential for the safety and efficient operation of the system.

GDTs are commonly used in a variety of different applications. Some common applications are protection of AC electrical systems, telephone/wireline networks, radio/TV receiving antenna systems, standby generators, lighting systems, and power cables. GDTs are also used as voltage regulators in electronic circuits, providing steady and reliable power. They are also used for EMI (electromagnetic interference) protection and in high frequency circuits to reduce interference.

The typical working principle of GDTs is based on a combination of gas sealed in a tube and a spark gap. When high voltage is applied to the GDT, the gas will be ionized and the current will flow through the spark gap. The ionized gas is able to handle the high voltage level without damage, preventing the system from overloading or short-circuiting. The spark gap also reduces the current when the voltage is under normal operating conditions.

In addition, GDTs can also be used for surge protection. They can absorb the surge current and prevent it from reaching the protected circuit. This will allow the circuit to function normally, protecting it from damage caused by voltage spikes. GDTs can also be used for transient voltage protection.

Overall, GDTs provide an excellent solution for surge protection and voltage regulation. They are reliable, durable, and easy to install. They also offer many benefits, such as preventing equipment damage and improving system reliability. GDTs have become an essential part of many electrical systems, providing the added protection that is needed to ensure safe and reliable operation.

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