150 V. This is positive in the resistance region. Electron–ion pairs are produced in the
intense electric field that exists between the electrodes when the spark gap is being
operated in the glow region. When they obtain sufficient energy they accelerate and
collide with neutral atoms or ions, producing more electron–ion pairs, and finally
leading to a general breakdown of the gap. During the arc phase the voltage across
the gap reduces to Va (10–25 V) and becomes virtually independent of the current.
The arc current can be very high and is limited mostly by the magnitude of the overvoltage
and the parameters of the circuit containing the spark gap. With decreasing overvoltage,
as in the second quarter of the applied sinewave, the current through the spark
gap decreases until it drops belowthe minimum value (0.01–0.1 A) necessary to maintain
the arc. The arc is extinguished at voltage Ve, after passing through the glow mode
again. The above processes are repeated during the negative half cycle of the sinewave.
The gas discharge tube is a bipolar device. That is, its characteristics do not depend
upon the polarity of the applied voltage.
150 V. This is positive in the resistance region. Electron–ion pairs are produced in theintense electric field that exists between the electrodes when the spark gap is beingoperated in the glow region. When they obtain sufficient energy they accelerate andcollide with neutral atoms or ions, producing more electron–ion pairs, and finallyleading to a general breakdown of the gap. During the arc phase the voltage acrossthe gap reduces to Va (10–25 V) and becomes virtually independent of the current.The arc current can be very high and is limited mostly by the magnitude of the overvoltageand the parameters of the circuit containing the spark gap. With decreasing overvoltage,as in the second quarter of the applied sinewave, the current through the sparkgap decreases until it drops belowthe minimum value (0.01–0.1 A) necessary to maintainthe arc. The arc is extinguished at voltage Ve, after passing through the glow modeagain. The above processes are repeated during the negative half cycle of the sinewave.The gas discharge tube is a bipolar device. That is, its characteristics do not dependupon the polarity of the applied voltage.
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