2027-40-C

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Gas Discharge Tube Arresters (GDT) are an important category of surge protection devices used to protect sensitive electronic equipment from high voltage electrical transients caused by lightning strikes. The 2027-40-C arrester is a particular model in this category, and has a variety of applications in the protection of both residential and commercial electrical systems. This article will examine the 2027-40-C GDT\'s applications, as well as its working principle.

Applications of the 2027-40-C GDT

The 2027-40-C GDT is a specialised non-detecting, low resistance type of arresters with high surge current handling capabilities. It is designed specifically for the protection of external electrical systems, such as telecom and power networks, from high voltage transient currents caused by lightning strikes. The 2027-40-C can be used in either forward or reverse polarised applications to provide both local and remote protection to equipment located in the immediate vicinity of a lightning strike, or at a distance away from the strike.

In addition, the 2027-40-C GDT can be used to protect electrical systems from overvoltage transients that arise from switching activities in the overhead lines and cable networks, during power synchronization, arc welding, or any other voltage inrush circumstances. It is particularly suitable for areas with higher than normal lightning density, at heights greater than 200 feet above the ground.

Working Principle of the 2027-40-C GDT

The 2027-40-C GDT is composed of a positively charged anode and an oppositely charged cathode, each having its respective terminals. The anode is connected to the power system in order to receive and “absorb” the transient current. The cathode is connected to the sensitive electronic equipment via an output lead. The arrester works by creating a capacitive voltage divider between the anode and cathode in response to a surge voltage. The voltage drop across the anode prevents the high voltage transient from passing through to the cathode.

When a voltage transient strikes the anode, the current flows into the GDT. As the current increases, it creates an electric field around the anode of the device. This electrical field draws electrons from the air and creates an electrostatic shield of negative ions that ionizes and dissipates the energy of the transient. As long as the surge duration is brief, the negative ions dissipate, and the cathode will not experience any surge.

When a surge of longer duration occurs, the capacitive divider can no longer protect the electronics from the surge. In this case, the GDT’s failsafe mechanism will be triggered. A carbon bridge will heat up and melt, creating a shunt between the anode and cathode of the device. This will create a low resistance path for the surge current to bypass the capacitive voltage divider, thus protecting the sensitive electronic equipment from any damage.

Conclusion

The 2027-40-C GDT is a specialized non-detecting, low resistance type of arrester with high surge current handling capabilities, that are specifically designed for the protection of external electrical systems from high voltage transients caused by lightning strikes or other overvoltage scenarios. Its capacitive voltage divider and failsafe mechanism make it a highly reliable protector of sensitive electronic equipment at both close and distant ranges.

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