Series:	--
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Voltage - DC Spark Over (Nom):	230V
Impulse Discharge Current (8/20µs):	--
Tolerance:	--
Fail Short:	--
Mounting Type:	DIN Rail
Package / Case:	Module

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Gas Discharge Tube Arresters (GDT)

Gas Discharge Tube (GDT) arresters are electrical protective devices that are primarily used in the power transmission and distribution industry in order to suppress transient overvoltages caused by lightning strikes. With a reliable level of protection, these GDT arresters prevent costly damage to both the equipment and wiring of an electrical system. GDTs arrests are beneficial for both high- and low-voltage applications. In addition to suppressing overvoltage surges, GDTs can also reduce the interference that lightning causes with sensitive materials. As a result, GDTs are a critical part of the overall electrical system protection and play an integral role in the growth of the power transmission and distribution industry.

Characteristics of GDT Arresters

The primary characteristic of GDT arrester is its ability to consume the incoming electrical energy and dissipate it as heat. Essentially, it acts as an effective current limit by providing a low-resistance path for the electrical current to flow. This allows the arrester to absorb the high voltage and reduce it to a safe level. Another characteristic of GDTs is that they adjust their internal resistance depending on the voltage level. This means that GDTs are able to effectively protect circuits with a wide range of voltages. This also allows them to be effective against both high and low voltage surges.

Classification of GDT Arresters

GDTs can be classified according to their:

• Voltage Rating – This is referenced in a unit called KV. GDTs are available in ratings of 0.4 KV to 72 KV.
• Current Rating – This is referenced in a unit called KVA and ranges from 0.005 KVA to 2.570 KVA.
• Thermal Rating – This is expressed as a maximum continuous load rating and is quoted in kVAR.
• Discharge Voltage – This is the nominal breakdown voltage of the GDT.
• Shape – GDTs are available in a variety of shapes, such as elongated or disc types.
• Category – GDTs can be classified as either external or internal.

Working Principle of GDTs

GDTs operate by using an ionizing gas which is sealed into a glass tube. The gas becomes ionized when the voltage level exceeds the arrester\'s specific breakdown voltage. This creates a low-resistance path for the electrical current to flow back to ground, thus limiting the voltage to a safe level. The ionization gases used in GDTs usually consist of either air, SF6 gas, or a combination of the two. The two main components of a GDT arrester are the insulator layer, which contains the ionizing gases, and the discharge element. The insulator layer contains the gases that ionize when a voltage surge occurs. When this happens, the gasses become electrically conductive and provide a path to ground for the current. The discharge element is the component that allows the current to flow to ground when the breakdown voltage has been exceeded.

Applications and Advantages of GDT Arresters

GDT arresters are primarily used in the power transmission and distribution industry to safeguard electrical equipment and wiring from overvoltage surges. They can be used in both high- and low-voltage applications and provide a reliable level of protection against costly damage.In addition to providing protection against surges, GDTs also provide a number of other benefits. They can reduce interference caused by lightning strikes, reduce the number of equipment outages and failures, and improve equipment reliability. In addition, GDTs have a relatively long service life and are generally maintenance free. This makes them a cost-effective solution for many applications.

Conclusion

GDT arresters are a critical component of any electrical system, providing reliable protection against overvoltage surges. By consuming the incoming surge current and dissipating it as heat, GDTs are able to limit the voltage level to a safe level. Additionally, GDTs can reduce interference caused by lightning strikes, improve equipment reliability, require minimal maintenance, and have a relatively long service life. As such, they are essential for the power transmission and distribution industry and provide an efficient and cost-effective solution for a variety of applications.

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