Abstract
This paper focuses on the arc voltage
measurements of electrical arcs burning inside
cylindrical tubes in nitrogen at different filling
pressures from atmospheric and up to 80 bar. To
investigate the effect of ablation, both nonablating
ceramic tubes (alumina) and ablating
polytetrafluoroethylene (PTFE) tubes with
different inner diameters have been investigated.
Arc currents of 150 A at 350 Hz have been used
throughout the experiment. It has been observed
that, at atmospheric pressure, there is an inverse
relationship between arc voltage and inner tube
diameter. At a high filling pressure such a
behaviour is not obvious. The arc voltage
instability increases with increasing filling
pressure. The arc voltage of arcs burning inside
ceramic and PTFE tubes is found to be similar in
the investigated current and pressure regions.
measurements of electrical arcs burning inside
cylindrical tubes in nitrogen at different filling
pressures from atmospheric and up to 80 bar. To
investigate the effect of ablation, both nonablating
ceramic tubes (alumina) and ablating
polytetrafluoroethylene (PTFE) tubes with
different inner diameters have been investigated.
Arc currents of 150 A at 350 Hz have been used
throughout the experiment. It has been observed
that, at atmospheric pressure, there is an inverse
relationship between arc voltage and inner tube
diameter. At a high filling pressure such a
behaviour is not obvious. The arc voltage
instability increases with increasing filling
pressure. The arc voltage of arcs burning inside
ceramic and PTFE tubes is found to be similar in
the investigated current and pressure regions.
