A multi-gap and multi-channel gas switch with convexo-convex discal planet electrodes was designed and investigated.Eight gaps are formed in series by a trigger electrode,six intermediate electrodes and two high voltage electrodes with a uniform gap length of 5 mm.The self breakdown and triggered breakdown performance of the switch are reported.Both the delay time and jitter decrease with the increase in the trigger voltage,switching coefficient and the decrease in the trigger isolating resistor.The delay time of the switch is about 40 ns,and the jitter is less than 2 ns when charged with±85 kV and triggered by a voltage pule of-75 kV.The inductance of the switch is about 30 nH.
The underwater electrical explosion of an aluminum wire is influenced by many factors,such as wire parameters,pulsed power energy,etc.In this paper,underwater electrical explosion of an aluminum wire was investigated with pulsed voltage in the time scale of a few microseconds. A self-integrated Rogowski coil and a voltage divider were used for the measurements of current and voltage at the wire load,respectively.The deposited energy before breakdown was calculated based on experimental waveforms of current and voltage by mathematical method. Effects of the applied voltage,circuit inductance and parameters of Al wire on the electrical explosion and energy deposition were analyzed by means of experiments and calculation.The results show that the current rise rate has an important influence on explosion process,such as the energy deposition before breakdown,the electrical power as well as the various explosion stages. A higher current rise rate can be achieved by increasing applied voltage and decreasing circuit inductance.The inhomogeneity of the energy deposition will result in prematured breakdown as well as lowered energy deposition,making the explosion process of wire more complicated.
Gas spark switch is one of the key parts in pulsed power technology.Electrode erosion has great influence on the switch performance and lifetime.In this paper,a field distortion gas switch is selected for the experiment and a great deal of discharging experiments have been conducted in different test conditions.The forming process of etch pit as well as its influencing factors is discussed briefly and surface roughness coefficient(SRC) of the electrode is put forward to evaluate the state of electrode erosion.Experimental results show that current peak plays an important role in electrode erosion when waveforms of discharge current are the same,and electric charge and oscillation frequency of discharge current also have great effect on the electrode erosion when waveforms of discharge current are different.With the increase of discharge times,SRC decreases slowly at first and then decreases quickly after three thousand of discharge times.
WANG Hu CHANG Jia-sen TONG Xin ZHANG Qiao-gen QIU Ai-ci
