2035-25-SM

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Gas discharge tubes (GDTs) are electrical devices used to protect electrical systems and components, as well as other electronic components from voltage spikes and resulting damage. Gas discharge tube arresters (GDTA) are a type of GDTs that are specifically designed for high voltage environments, such as in outdoor power distribution systems with voltages exceeding 250 kV.

GDTA are composed of two components- an insulating gas filled tube and active electrodes. The active electrodes form the two terminals of the GDT. As voltage increases and reaches a certain level, the gas inside the tube begins to ionize, which creates an electrical path between the two electrodes, allowing current to flow. This allows the potential voltage level (the limit of current flow) to be reduced, thereby protecting the other components.

The gas-filled tube of a GDT is usually filled with noble gas, commonly used types being argon, helium, xenon, and/or krypton. The concentration of the gas is an important factor in determining the current level where the GDT will be activated. It is also determined by the temperature of the electrode. The higher the temperature, the lower the current level at which the GDT will be activated.

The operating principle of a GDTA can be described as follows. During normal operation, the potential difference between the two active electrodes is normally much greater than the breakdown voltage of the gas. As soon as the voltage increases beyond the breakdown voltage of the gas, current starts to flow through the tube, thereby reducing the voltage. The voltage is reduced until it is below the breakdown voltage of the gas, when the current stops flowing. This ensures that the voltage is held steady and any further increases in voltage is blocked.

The GDTA is widely used in the high-voltage systems and areas, such as power lines, telecommunications systems, and other electrical/electronic components. GDTAs are suitable for use in systems with operating voltages exceeding 250 kV, and are mostly used in outdoor applications as their gas-filled tube also provides an arc-quenching capability. GDTA can also be used to protect capacitors from over-charging, as well as for protection against lightning strikes and insulation breakdown.

The GDTA has several advantages over other types of GDTs, such as being more reliable, having a longer life, providing a higher level of protection against voltage surges, and being able to hold the voltage at a steady level for a longer period of time. GDTA are also relatively easy to install and require no special maintenance.

In summary, Gas Discharge Tube Arresters (GDTA) are an important and reliable protection device, widely used in high-voltage systems for safety and efficiency. They are composed of two components - an active electrode and a gas-filled tube, with the latter providing arc-quenching capabilities and the ability to reduce voltage levels and hold them at a steady level for a longer period of time. The GDTA can provide superior protection against voltage surges, as well as other issues including over-charging capacitors, lightning strikes, and insulation breakdown.

The specific data is subject to PDF, and the above content is for reference