GT-CM3350L

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Gas Discharge Tubes (GDTs) are electrical protective components that limit transient high voltage peaks and provide surety to equipment against damages due to lightning strike or electrical surges. An example of a GDT is the GT-CM3350L, a hybrid type of arrestor designed to handle medium, slow and fast transient overvoltages. This article will discuss the application fields of the GT-CM3350L and its working principles.

Application fields of GT-CM3550L

The GT-CM3550L is a relatively recent type of GDT. It is a hybrid technology arrestor which combines the best aspects of two different technologies: metal oxide varister (MOV) and gas-filled discharge tube (GDT) technologies. It is suitable for indoor and outdoor applications, and is primarily used for power and communication lines. It can provide medium- to long-term overvoltage protection against lightning strikes, high-energy switching/inductive transients, and other fault conditions for power system heights of up to 400 kV. Generally, the GT-CM3550L has high stability and long service life and requires little or no maintenance.

The GT-CM3550L is suitable for use in power system, telecom systems and data networks, including outdoor and indoor power systems, telecommunications systems, outdoor radio and television systems, railway or subway power systems, and other communication systems. It is also suitable for use in residential distribution systems, commercial building distribution systems, high-rise building distribution systems, industrial power distribution systems, motor protection systems, and many other systems.

Working Principle of GT-CM3550L

The GT-CM3550L features a design that combines two different technologies: metal oxide varister (MOV) and gas-filled discharge tube (GDT) technologies. In a typical design, these two technologies are connected in parallel to form a hybrid system. When an overvoltage occurs in the system, the MOV component first connects with the overvoltage, and then the GDT component connects with the overvoltage. The combination of the two technologies provides better protection and extended protection range.

When no overvoltage occurs in the system, the MOVs remain in a non-conductive state. When an overvoltage exceeds the holdover voltage of the MOVs, the MOVs turn to a conductive state and discharge the overvoltage to the ground. When the incoming overvoltage level continues to increase, the GDT component will connect with the overvoltage and conduct the major part of the over-voltage current to the ground, then limit the surge current and reduce the overvoltage to a safe level. When the overvoltage goes beyond the peak voltage of the GDT component, the gas-filled inner tube of the component can be triggered by the high-field capacitance effect, and electrons will be emitted to conduct part of the current.

Once an overvoltage occurs, the MOV and GDT will cooperate and suppress the overvoltage. When the MOV component is saturated, the GDT component will begin to conduct, and when the overvoltage level continues to increase, the GDT component will conduct more of the surge current, thus limiting the transient peak overvoltage. Finally, when the transient peak overvoltage is lower than the specified value, the GDT component will be reset, and the MOV component will again enter a non-conductive state.

Conclusion

The GT-CM3550L is a hybrid of MOV and GDT technologies designed to handle medium, slow and fast transient overvoltages. It is suitable for indoor and outdoor applications, and is primarily used for power and communication lines. It offers medium- to long-term overvoltage protection against lightning strikes, high-energy switching/inductive transients, and other fault conditions. The GDT component works by conducting part of the current, thus limiting the transient peak voltage. With its combination of two technologies, the GT-CM3550L provides reliable, long-term protection for electric/electronic equipment in a variety of application fields.

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