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Gas Discharge Tube (GDT)
  • Gas Discharge Tube (GDT)
  • Applications

Vs

D.C. Spark-over Voltage

The voltage at which the GDT sparks over with slowly increasing d.c. voltage.

— (IEC 61643-311)

 

V

Impulse Spark-over Voltage

The highest Voltage which appears across the terminals of a GDT in the period between the application of an impulse of given wave-shape and the time when current begins to flow.

— (ITU-T K.12)

 

Va

Arc Voltage

Voltage drop across the GDT during arc current flow.

— (IEC 61643-311)

 

Vgl

Glow Voltage

The peak value of the voltage drop across the GDT when a glow-current is flowing, It is sometimes called the glow mode voltage.  

— (ITU-T K.12)

 

8/20 μs

8/20 Current Impulse

Current impulse with a nominal virtual front time of 8 µs and a nominal time to half-value of 20 µs.

— (IEC 61643-11)

 

1.2/50 μs

1.2/50 Voltage Impulse

Voltage impulse with a nominal virtual front time of 1.2 µs and a nominal time to half-value of 50 µs.

— (IEC 61643-11)

 

I

Alternating Discharge Current

The r.m.s. value of an approximately sinusoidal alternating current passing through the GDT.

— (ITU-T K.12)

 

In

Nominal Discharge Current

Crest value of the current through the GDT having a current waveshape of 8/20 µs.

— (IEC 61643-11)

 

Imax

Maximum Discharge Current

Crest value of a current through the GDT having an 8/20 µs waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.

— (IEC 61643-11)