What is the function of gas Discharge tube?
Gas discharge tubes dissipate voltage transients through a contained plasma gas. They have high insulation resistance plus low capacitance and leakage to ensure minimal effect on normal operation of equipment.
Which gas is filled in electric tubes?
Argon is a commonly used gas, used to fill incandescent light bulbs. It increases the bulb life by preventing the tungsten filament from deteriorating too quickly. Other gases such as helium, neon nitrogen and krypton are also used in lightning.
What happens in a discharge tube?
…is usually measured in an electric discharge tube in which a fast-moving electron generated by an electric current collides with a gaseous atom of the element, causing it to eject one of its electrons. (Chemists typically use joules, while physicists use electron volts.)
How does a gas discharge bulb work?
Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. Typically, such lamps use a noble gas (argon, neon, krypton, and xenon) or a mixture of these gases. Light of a characteristic frequency is thus emitted.
How are gas discharge tubes used in electrical circuits?
Gas Discharge Tubes (GDT) – Introduction GDT’s are special type of gas filled tubes used for wide range of electronic/electrical circuits for providing protection against lightning and other power surges. These tubes basically has two electrodes that are kept inside a gas filled closed envelope.
Which is the best gas discharge tube for surge protection?
The EPCOS B88069X8920B252 3-electrode gas discharge tube provides similar protection level as the previous product, but it is a bit more heavy duty. The capacitance of this product is less than 0.8 pF, and it provides higher transient response (up to 25 kA).
Can a gas discharge tube be used as a lightning protector?
An image of a ceramic discharge tube is shown below. Take a look. There will be conduction inside the GDT’s due to ionization of gas molecules. Each GDT have a specific voltage and current rating. A simple lightning protector circuit is given below.
When to use a gas discharge tube ( GDT )?
GDTs have been replacing carbon blocks in central office and remote access equipment installations due to their robustness and better electrical performance in the traditional POTS (Plain Old Telephone Service) type applications.