SL1021A300RS

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Gas Discharge Tube Arresters (GDT) are made up of a capacitor, spark gap, and an ionizing medium. This combination is used to protect electrical systems from overvoltages created by lightning, switching operations, and other transients. SL1021A300RS is one example of a GDT device.

Application Field

SL1021A300RS is a Gas Discharge Tube Arrester designed for the field of DC Power Systems used in the electrical specific network. It is suitable for use in power grids, photovoltaic systems, wind-power systems, network rail transit systems and other uninterrupted power supply systems. With its radome and weather-proof technology, they are able to be applied to high-voltage or low-voltage DC power systems, and is applied in terms of over-voltage protection.

Working Principle

When large transient surge, land lightning waves and electric types occur, an elevated voltage rise may to some extent destroy the normal operation of power electronics and electrical apparatus.This is the sub-power system. As soon as the strike of high frequency lightning is passed through the input and output terminals of GDT device, it forms an unacceptable low impedance path for the surge. The surge will be absorbed by a capacitance resistor combination in SL1021A300RS. The electrical energy will be guided through the spark gap into the ionized gas medium. When this happens, the arc generated is created in the ionized gas, which incinerates the surface dust and spread the gas to the dielectric space and form an arc. This mechanism will reduce the voltage stress on the protected devices. When the surge has been passed, the spark gap recovers automatically.

The device can work effectively in the operating range of voltage between -80V to +100V (DC). When the negative voltage is below -80V, the output capacitor will start to charge up, when it is over +100V, the system will be in the arc discharge state. The device is able to work under temperature ranging from -50 to +70°C.

Conclusion

SL1021A300RS is one example of a Gas Discharge Tube Arrester applied in DC Power Systems. It is a combination capacitor, spark gap, and an ionizing medium, which are used to protect the electrical system from overvoltages caused by lightning, switching operations, and other transients. Its working principle is that when there is a surge, a voltage rise is created and an arc is formed in the ionized gas, incinerating the surface dust and spreading the gas to the dielectric space, forming an Arc, which reduces the voltage stress on the protected devices.

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