SL1021A450R

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Gas Discharge Tube Arresters (GDT) are generally used in electrical power systems or telecommunication systems as protective devices. This article will discuss the application field and working principle of SL1021A450R GDT.

Introduction

SL1021A450R is a type of Gas Discharge Tube (GDT) commonly used as an arrester to protect the overvoltages. It is a kind of nonlinear circuit element, which can be used in both AC and DC power systems. SL1021A450R GDT is designed with double-ended discs, and inserted into the cylindrical GDT. Its rated voltage is between 2.1KV and 4.5KV, and the capacitance of connection electrodes is below 1pF.

Application Field

SL1021A450R GDT arrester is mainly used to protect the power system or telecommunication system from overvoltage induced by external lightning, or switching transients, and to limit the damages of high or low voltage. One typical application field of SL1021A450R GDT is transmission line application, where it can suppress overvoltage caused by lightning. The GDT arresters can also be used in other applications such as distribution lines, substations, and other places that require protection.

Working Principle

SL1021A450R GDT works by limiting the amplitude of the voltage drop on the arrester without affecting the normal operation. It works in two or three stages, depending on the applied voltage. During the first stage, when the applied voltage is below the breakdown voltage, the arrester will remain in breakdown state, and the electric surge will flow through the GDT and be dissipated. In this stage, the electric surge is dissipated, and there is no current flowing through the GDT. In the second stage, when the applied voltage is above the breakdown voltage but below the voltage maximum limit of the GDT, the current will flow through the GDT, and the voltage across the GDT will remain at the breakdown voltage. In the third stage, when the voltage exceeds the maximum limit of the GDT, the voltage across the GDT will be clamped at the maximum limit of the GDT.

Conclusion

SL1021A450R GDT arrester is mainly used in power systems and telecommunication systems. Its working principle is based on the limit of the amplitude of the voltage drop and preventing any overvoltages to damage the system. This article has discussed the application field and working principle of SL1021A450R GDT.

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