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In the changing electrical power systems, the threat of direct lightning strikes and other transients has become a major concern. To limit the impact of these hazards, gas discharge tubes (also known as spark gaps or simply GDTs) arresters have been developed to provide for safe power delivery and underground cabling protection.

Gas Discharge Tube Arresters (GDTs) are commonly used as protectors for substations, power lines, and underground cables, and are designed to prevent damage due to lightning and other transient events. These products operate by partially blocking the voltage of the power line, and when an overload or electrical surge is detected, they rapidly intercept and divert the electric current, thus providing safe protection from overvoltages.

GDTs feature a hermetically sealed ceramic tube filled with a dielectric gas like sulfur hexafluoride (SF6). This ceramic tube contains two silver electrodes, with one connected to either ground or the insulated side of the line. When the power line voltage reaches a level above the dielectric strength of the gas, an arc is generated and the current is diverted. The arc is extinguished as soon as the overload dissipates.

GDTs have a variety of applications in the field of electrical power systems. They are used to protect against overvoltage events, such as lightning strikes, as well as to provide overcurrent and short-circuit protection. GDTs have also been used to protect power systems from electronic disturbances, such as harmonics and power surges.

The main advantages of GDTs over traditional electrical protection equipment, such as fuses and circuit breakers, are their superior response time and exceptional performance in high frequency applications. GDTs are better suited for applications that require high-speed on-site response, such as lightning and other transient protection, due to their fast response time. In addition, GDTs provide all-weather protection and are able to withstand high temperature and humidity levels.

GDTs have become increasingly popular in new construction projects and existing installations due to their high performance, reliability, and affordability. With their superior response time and exceptional performance in high-frequency applications, GDTs are becoming the preferred choice of many power system designers and engineers.

In conclusion, GDTs provide excellent protection for power systems by providing a sub-cycle response that will protect against both overvoltage and overcurrent events. In addition, they offer superior performance and reliability due to their faster response time and resistance to high temperatures. With their many advantages, GDTs have become the preferred choice of many power system designers and engineers and are increasingly becoming the standard for protection of underground cabling and other power systems.

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