SL1021A200RS

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Gas discharge tube (GDT) arresters are applied components in power engineering, providing maximum surge voltage protection. A typical GDT arrester is the SL1021A200RS. This arrester is designed to arrest high temporary over-voltage transients in a line while at the same time maintaining the highest level of current and voltage insulation.

The principle of operation for this type of arrester is based on the control of external electric field across an air gap (i.e., the gas gap) within the arrester. When a transient occurs such as lightning or switching transients, the electric field across the air gap increases until it is strong enough to create a spark or arc across the gap. This arc interrupts the flow of electric current and thus prevents further rise of the voltage. Once the voltage returns to normal, the arc is extinguished. As the arrester is exposed to repeated overvoltages, it gradually degrades and its protective properties become significantly reduced.

The SL1021A200RS GDT arrester has a voltage rating of 200 kV and a maximum surge current capability of 1.2 kA. It is designed to protect distribution lines, power plants, substations and other electrical equipment from power surges, spikes, and ground faults. The arrester is designed to withstand impacts from lightning from both positive and negative cloud-to-ground discharges. The arrester also has a high insulation resistance and forms a reliable protection component in the power supply network.

The arrester is made up of an insulated metallic housing with an internal gas chamber and a gas discharge tube (GDT) placed between the two electrodes. The GDT is filled with a non-flammable gas medium such as SF6 gas at extremely low pressure to ensure an efficient spark gap. The important components of thehousing and GDT are the lightning mitigation devices such as resistors, surge arresters and sprinkler systems. The arresters effectively reduce the maximum surge current or short-circuit current to tolerable levels.

The SL1021A200RS GDT arrester also includes an arrester body or ground equipment where the arrester is mounted. The arrester body is connected to a system grounding conductor and provides an alternate path for the transient current to flow away from the line. The grounding conductor helps dissipate the transient energy safely to ground. The arresters also include a metal shielding surface to provide additional protection against the effects of electromagnetic fields and reduce the arrester’s exposure to lightning strokes.

The SL1021A200RS GDT arrester is designed to provide a safe and reliable level of power supply protection. It is light-weight, portable and highly efficient, and its cost is also low. It is suitable for use in a variety of applications, including power distribution, industrial and commercial automation, railway systems, military and aerospace applications. The arrester is also widely used in residential power supply systems.

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