GTCA28-302M-P01

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Gas discharge tube arresters (GDTs) are special devices used to provide electrical protection against transient overvoltages in electrical systems. The GTCA28-302M-P01 is a three-phase, solid state, gas discharge tube arrester. It is commonly used for medium voltage applications and is rated for a maximum voltage of 7000 V.

GTCA28-302M-P01 consists of a hollow outer metal cylindrical body covered with carbon electrodes and two electrodes sealed in hardened glass tubes. Inside the metal surface, a dielectric gas is contained at a specific pressure, usually 2 to 4 atmosphere, depending on the application. The GTCA28-302M-P01 is filled with an inert gas, such as argon, to provide insulation against the high voltage that it will be exposed to.

The GTCA28-302M-P01 is designed to protect the electrical system from damaging voltage spikes that can occur during electrical storms or other conditions. When a voltage spike occurs, the current will flow through the gas discharge tube. As the pressure in the tube increases, and the voltage increases up to its breakdown point, the gas within the tube will reach ionization and become conductive, allowing the current to flow out of the arrester. This process provides a low-resistance path for the voltage spike, diverting it away from the protected system.

Once the voltage surge subsides, the gas within the tube returns to its insulating state and the resistance rises, preventing additional current flow. This process prevents any damage to the protected system due to excessive voltage, since the voltage spike is diverted away from the system. The built-in current limiting mechanism of the GTCA28-302M-P01 also prevents the voltage spike from exceeding the protected system’s operating voltage.

GTCA28-302M-P01 is typically used in: Transformer substations, Industrial facilities, Utility networks, Renewable energy systems, Oil and gas production plants and other high voltage applications.

It is designed to protect the system against a wide range of overvoltage, from lightning induced overvoltages and switching operations to spikes generated by nearby power system faults. It can also provide voltage regulation function, which helps in maintaining constant voltage on the protected area.

The working principle of GTCA28-302M-P01 is simple; it utilizes the electrical breakdown phenomenon of a dielectric gas (normally gas filled inside plastic tube) to provide electrical protection from transient overvoltages. Once a voltage spike occurs, the electrons within the gas ionize, allowing them to move freely. This releases the extra charge as current, which is then diverted away from the protected system.

Once the voltage subsides, the gas returns to its previous insulating state, and the arrester will remain in a safe condition for the next overvoltage event. The high impulse curves of this type of arresters are designed to provide maximum protection against voltage spikes resulting from lightning and other conditions. The built-in current limiting mechanism also prevents the voltage spike from exceeding the protected system’s operating voltage.

In conclusion, GTCA28-302M-P01 is a three-phase gas discharge tube arrester that is ideally suited for medium voltage applications, providing electrical protection against transient overvoltages in electrical systems. The device is designed with a dielectric gas to provide insulation against the high voltage that it will be exposed to. It utilizes the electrical breakdown phenomenon of a dielectric gas to provide electrical protection from transient overvoltages. The built-in current limiting mechanism of the GTCA28-302M-P01 also prevents the voltage spike from exceeding the protected system’s operating voltage. This arrester can be used in a variety of applications, including power systems, industrial facilities, renewable energy systems, and oil and gas production plants.

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