GTCA28-351M-R20

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Gas discharge tube arrester (GDT) are an important component in substation protection scheme which provide protection to power system equipments from overvoltage. GDTs are electronic protection devices which functions by blocking or diverting high voltage surges caused by lightning ending. The GDT\'s also provide low impedance currents paths to the ground and thereby eliminate hazardous voltages. The GTCA28-351M-R20 are the most widely used type of Gas Discharge Tube Arresters (GDT).

The construction of the GTCA28-351M-R20 can be categorized into two sections, namely the main body and the accessory parts. The main body consists of a zinc oxide element that provides the surge diversion capability, a ceramic spacer which acts as a high energy barricade which isolates the main body from the mounting directly, two spring-style electrodes, and an insulated plastic housing. The accessory parts consist of a ground electrode that specially designed for lightning surge dissipation, a built-in test resistor, and a shield cover. All the components work together to create a safe and reliable surge arrester with an assured performance.

The GTCA28-351M-R20 Gas Discharge Tube Arresters (GDT) offers excellent protection for overhead transmission lines. It operates efficiently during heavy storms when the lightning activity is intense and it can effectively dissipate high-frequency transients and overvoltage surges caused by lightning and switching operations. Its effective operation helps protect a wide range of power equipments, ranging from small transformers, line distributors to large power plants. The GTCA28-351M-R20 also has a superior resistance to high temperatures, which makes it ideal for outdoor applications.The working principle of the GTCA28-351M-R20 is based on the concept of gas discharge. When a surge voltage is applied to the device, it activates an avalanche diode, which sets off an ionization process in the gas that is present inside the tube. This ionization process produces a low-impedance “arc” that can dissipate huge amounts of energy. The arc is self-sustaining as long the voltage is above its inception level. The GTCA28-351M-R20 can also be triggered by lightning, providing immediate protection of substation equipments.

The GTCA28-351M-R20 has a wide electrical parameter range and can easily fit into most substation protection systems. It is designed to provide maximum protection in case of operating voltage surges, transients, and electromagnetic interference. The device has an overload withstand rating of 20kV/10kA and fault current withstand rating of 6kA, ensuring reliable protection even under extreme conditions.

In conclusion, GTCA28-351M-R20 Gas Discharge Tube Arresters (GDT) provide excellent protection from energetic over voltage and lightning events. Its robustness makes it a reliable solution even for the most extreme scenarios. It has a wide temperature range and superior shielding performance for outdoor operation. This arrester has precisely designed components, which make it an ideal choice for power systems in substation protection schemes.

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