2026-09-CLF

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Gas Discharge Tube Arresters or GDT are devices used to protect electrical components from lightning and other electrical surges. These arresters are connected to electrical circuits or substations and divert any extra voltage into the ground to avoid any system overload. GDT are designed to conduct as normal resistive loads until an abnormally high voltage is detected. At that point, the internal capacitance of a GDT will break down, creating an electrical current and then quickly returning the system to its normal state.

The main purpose of GDT is to protect electrical systems from lightning, high voltage, and other possible surges or faults. Typical applications of GDT include overhead and underground utility lines, telephone and cable lines, building lightning protection, surge suppressors, televisions, refrigerators, and other household appliances.

2026-09-CLF application field and working principle refer to applying GDT to the fields of industrial automation, electrical engineering, and power engineering. In automation, GDT protect a wide range of electrical components, such as contactors, synchronous motor starters, and programmable logic controllers. In electrical engineering, GDT protect meters, breaker panels, and switchgear from sudden impulse charges. And in power engineering, GDT protect main lines of distribution feeder and transformers.

The working principle of GDT in industrial automation, electrical engineering, and power engineering is based on the same principle of protection. When a surge voltage comes into contact with the GDT, it will conduct through the protection channel and bypass the protected electrical elements. It will be then conducted into the ground and safely dissipate. Similarly, when an abnormally high voltage is detected, the internal capacitance of a GDT will break down, creating an electrical current and then quickly returning the system to its normal state.

GDT are typically constructed with a metal body and a glass or ceramic tube containing a low pressure, low resistivity gas. The electrodes of the tube are insulated from the body. When the system is operating normally, the tube remains non-conductive. When the tube is exposed to a surge or other high voltage, the electrons in the gas are accelerated, causing ionization, or a spark across the electrodes. This spark conducts the current away from the protected system and into the ground.

Gas Discharge Tube Arresters are important components in an electrical system and provide necessary protection. These arresters not only protect electrical components from lightning and other electrical surges, but also dissipate abnormal surges such as those generated by switching power supply or lightning strikes. The GDT working principle of industrial automation, electrical engineering, and power engineering is based on the same principle of protection, creating an electrical current when an abnormally high voltage is detected and then quickly returning the system to its normal state. With proper installation, GDTs can effectively protect hardware and people from serious damage caused by electrical surges.

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