CG33.0

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Gas Discharge Tube Arresters (GDT) have been employed in the electric utility industry for many decades to protect electrical systems from transient overvoltages and lightning strikes. CG33.0 is an important type of GDT, which has wide application fields and typical working principles.

CG33.0 mainly works on AC power systems with voltage level ranging from 110 - 420V. Its various applications are as follows. Firstly, it can be used as a load switch disconnect arrester for overvoltage protection in front of distribution transformers and other high value single phase electronic components. Secondly, it can be applied in overhead power line systems, motor control centers, distribution substations, as well as multifunctional applications. Last but not least, owing to its high rating characteristics, the CG33.0 is also widely used for ground-fault protection.

The working principle is also quite simple. Under normal operating voltage, CG33.0 behaves like a closed switch. If the voltage reaches or exceeds the arrester\'s rate voltage, a sparkover occurs between the two contacts, thus the connection is broken. The open sparks of the arrester provides effective protection for power system due to their ability to transfer energy to the ground thereby limiting the highest voltage level on the system.

The peak value of GDT is determined by its peak instantaneous current capability, the break-over voltage and its energy absorbing capacity. For CG33.0, its peak current ranges from 6kA to 40kA, and its energy absorbing capacity lies in the range of 0.3 - 0.8 MJ. The typical characteristics of these parameters are comparable to other high power resistor materials.

In conclusion, CG33.0 plays a very important role in protecting power systems from transient overvoltages and lightning strikes. Its wide application fields and typical working principle make it become one of the most frequently used GDT across the world.

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