Design And Characteristics Analysis For The Image Collection System Of Vacuum Arcs

Researches on the basic theory and its application of vacuum arc are one of the subjects in the field of high voltage apparatus recently. With the higher demand of reliability and automatization of electrical power system, intelligence of apparatus has become a hot issue. As a new kind of intelligent apparatus the phase-controlled switching which can close the circuit at the time of zero voltage and open it at the time of zero current. Obviously vacuum arcs in short-gap is one of the key characteristics of phase-controlled switching. People have done much work on vacuum arc in long gap and gotten many achievements. Compared with these too little work has been done on vacuum arc in short-gap, series of experiments were done to do researches on vacuum arc in short-gap in this paper.In order to do researches on vacuum arcs in short-gap a demountable vacuum chamber is necessary. In the chamber there are a fixed anode and a movable cathode. The distance between the poles can be adjusted by moving the cathode. Degree of vacuum is gained by two series pumps. The anode and cathode use most commonly used contacts of radial magnetic field at present. The arc is triggered by an electrode fixed in the cathode. The triggering circuit can supply a high instantaneous voltage and a high current. From the waveform that we got from the experiments we can prove the positive volt-current characteristic of vacuum arc. By analyzing the high voltage of triggering circuit the relation of breakdown voltage and the gap is obtained.The aims of our work are to design of optical diagnosing system which uses the double-channel Linear array CCD to sense light. The system communicates with our computer by PCI bus. The images of vacuum arc first need quantify to get the digital image, make smooth processing, two-value and edge detection. We can get some characteristics of vacuum arcs from the images that got from CCD. By building a symmetry model of vacuum arcs its micro-parameters were analyzed. At the end of this paper we analyze the radial electron density and electron temperature of vacuum arc plasmas and view the future work.