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What is GDT(Gas Discharge Tube) in surge protection
Therefore the GDT almost completely meets all requirements made on a protective element. lt can limit the overvoltage to permissible values reliably. Under normal operating conditions the high insulation resistance and the low capacitance contribute to the fact that a GDT has virtually no impact on the system to be protected.
lDC spark-over voltage 70...7500V
llmpulse discharge current (8/20 us) Max Value 100KA
llmpulse discharge current (10/350 us) Max Value 100KA
lAlternating discharge current (1 s) Max Value 20A
lAlternating discharge current (0.2 s) Max Value 300A
lArc voltage 10...35V
linsulation resistance Min Value 1GΩ
lCapacitance Min Value 0.2pF
The basic structure of discharge tube consists of gas-discharge path and external protective layer. Stable conditions can only be ensured if the discharge path is shielded against these environmental influences. The outer protective layer is usually a ceramic insulator. Our superior insulator and electrode sealing technology ensures a hermetically sealed discharge space.We need to choose right gas inside the GDT, the preferred gas are neon and argon these two noble gases, they can ensure the discharge tube has the best electrical performance.
The effective electron surface of the electrode is coated with electron powder. A conductive band is attached to the surface of the insulation body, which is used to change the electric field distribution, accelerate the gas discharge process, and achieve the best response when rising rapidly.