B88069X5020T103

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Gas Discharge Tube Arresters (GDT) have been widely used in electrical power systems, due to their ability to conduct electricity in a normal state and quickly dissipate excessive voltage when fault conditions occur. The B88069X5020T103 is a GDT product from Siemens AG. The details of this GDT’s application field and working principle are presented in this paper.

Application Field

The B88069X5020T103 GDT is used to protect high voltage power systems against overvoltage transients caused by lightning strikes and switching operations. It is suitable for the 240/400 kV high-voltage direct current power line and it is also compliant with the latest earthing system requirements for public systems. The B88069X5020T103 GDT is especially suited for regions subject to frequent lightning strikes, and it has been tested under all kinds of test criteria to ensure reliable operation in both lightning-impulse and switching-transient conditions. The product is capable of providing effective surge protection up to 5 kV.

Working Principle

The working principle of GDT is mainly based on “freewheeling” effect. When a voltage above a certain threshold is applied to the GDT, a current flows in it, which discharges the stored charge accumulated in the GDT and re-stabilizes the supply system. The GDT has a non-linear characteristic, which does not allow excessive current to flow until the voltage rises. Once it reaches the peak value, the current starts flowing, suppressing the overvoltage promptly. In order to accomplish this, the GDT should have several components such as the GDT body, electrodes, and a surge current source. The main component of the device, is the GDT body, consisting of two metal electrodes with a hermetically sealed glass tube containing a gas mixture. When the current through the GDT exceeds its capacity, and when voltage through the GDT exceed its peak voltage, the GDT will break down into a low resistance (low impedance) state, which dissipates the transient surge energy.

The B88069X5020T103 GDT offers a significantly enhanced level of surge protection. It has a neat design with reduced dimensions, a high current impulse withstanding capability and a required response time of less than 10 ns.The device also offers a low-temperature heating characteristic, which limits the temperature rise in the event of a surge. To ensure reliability, the B88069X5020T103 GDT device is designed to have an operating life of more than 15 years.

Conclusion

GDT, such as the B88069X5020T103, is a reliable overvoltage protection device for high voltage lines. It is designed for application in public power systems and is tested under a variety of conditions. It has a neat design with reduced dimensions, and a high-current impulse withstanding capability and low temperature rise. With an operating life of more than 15 years, it offers a superior level of protection and ensures reliable operation in lightning-impulse and switching-transient conditions.

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