SL1021A450RG

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Gas Discharge Tube Arresters (GDT) are a commonly used over-voltage protection device in the power grid system. The SL1021A450RG is a typical kind of GDT with over-voltage protection capacity from 1.8/50 to 10/700μs. In this article, the application field and working principle of the SL1021A450RG will be discussed.

Application Field

The SL1021A450RG is mainly used in the construction of medium and high voltage overhead transmission lines or distribution lines. Generally speaking, GDT are applied to prevent lightning-induced over-voltage breaking out or propagating into the load side. The SL1021A450RG can effectively provide protection against lightning surge, switching surge, and various kinds of induced surges for medium-voltage power transmission and distribution lines.

Working Principle

As a kind of GDT, the working principle of the SL1021A450RG can be mainly divided into two stages. During the first stage, the main component of this GDT is the spark-over gap, which can discharge the solar radiation and short-term over-voltage of lightning. When a certain over-voltage appears, the arc will be generated in the spark-over gap, then the limiting element will limit the basic characteristics of the GDT, and the over-voltage will be suppressed from the lightning end to the load side. During the second stage, when the over-voltage exceeds the certain value, the GDT needs to transfer the high voltage energy that is limited and suppressed into heat energy, so it is necessary for the GDT to have certain heat dissipation measures. In this way, the over-voltage can be effectively and quickly reduced to the safe level. After that, the spark-over gap can recover automatically, to ensure that the system can resume its normal state.

Conclusion

In summary, the SL1021A450RG is a typical GDT, widely applied in the medium-voltage power transmission and distribution lines. The working principle of the SL1021A450RG can be divided into two stages, in which the pre-discharge of the arc and the heat dissipation measures are both involved, to effectively prevent over-voltage.

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