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多棒极型触发真空开关触发特性 总被引:1,自引:0,他引:1
主要研究多棒极型触发真空开关(TVS)的触发特性及其影响因素.研究表明,真空开关的触发时延主要由导通时延决定,增加触发电流的幅值和陡度(di/dt)可减小TVS的导通时延及其分散性.脉冲变压器直接触发TVS,可通过减小变压器漏感、提高触发电容的充电电压或增加触发电容电容量来降低导通时延及其分散性,但触发电容增加到一定值后对增加触发能量无帮助,没有必要继续增加.变压器直接触发方式可使导通时延减小至4ms左右,但分散性较大,且存在较小的触发回路电流导致的触发极熄弧现象.在脉冲变压器直接触发回路的基础上设计并研究了两种改进的触发回路:一种为脉冲变压器匹配续流回路,TVS导通时,通过续流回路的充电电容续流可使触发电流达kA级,导通时延减小至2~4μs,由于回路结构复杂,受到杂散参数影响,触发电流的幅值和陡度受到限制;一种为改进的触发回路,在触发极和阴极两端直接并接电容,导通时延可保持在1μs之内.最后研究并确定了并接电容选取依据和取值区间;对触发电压较小的TVS可在并接电容和触发极之间串联间隙,增大电容的充电电压和触发极能量,达到TVS可靠、精确触发的目的. 相似文献
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A test study on 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has been carried out in a specially designed discharge cabinet. A mechanical sieve is set up for sifting different solid particles into the discharge space uniformly. The lightning impulse voltage according with international electro-technical commission (IEC) standard is applied to the electrodes inside the discharge cabinet by the rule of up-down method in a total of 40 times. The results showed that the 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has its own features and is much different from that in air. 相似文献
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研究了脉冲波形对自行设计的多棒极型激光触发真空开关的时延、抖动和最低导通电压等参量的影响.理论分析并且实验研究了单峰脉冲与双峰脉冲在开关的触发阶段和导通阶段对主电路导通特性的影响.结果证明相同能量且脉宽较短的单峰脉冲导致的时延、抖动均比双峰脉冲小,两者最低导通电压相等,为优化触发激光脉冲波形提供依据和参考.通过改变照射的单峰脉冲能量,并且用场致发射扫描电子显微镜观测,研究了不同能量脉冲对靶电极质量损耗以及成分损耗比例的区别,为进一步提高靶电极寿命提供依据和参考. 相似文献
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As a new method to cure acute respiratory distress syndrome (ARDS), high blood pressure and some illnesses related to the lung, NO has recently received more attention. Thermal plasmas produced by arc discharge can create medical NO, but the concentration of NO2 produced by arc discharge must be controlled simultaneously. This paper investigates the characteristics and regulations of NO production at different flow distribution by pulsed arc discharge in dry air with a special pulsed power, The experimental results show that the flow distribution has a considerable effect on the NO concentration, the stabilization of NO. The production of NO2 could be controlled and the ratio of NO2/NO was decreased to about 10% in the arc discharge. Therefore, the arc discharge could produce stable inhaled NO for medical treatment by changing the flow distribution. 相似文献
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An application of magnetic field to the nanosecond pulse corona discharge is investigated. A cylinder reactor with different corona electrodes is set up for experimental study. A magnetic field with its direction perpendicular to the corona discharge is applied. Different discharge images are taken under single nanosecond pulse with a high sensitive UV-visible light imagine recorder. Experimental results show that with a cross magnetic field the nanosecond corona discharge both generates paths and develops homogeneously in space more than that without the magnetic field. The results may lead to a possibility to apply a cross magnetic field on nanosecond pulse corona discharge for getting higher desulfurization efficiency. 相似文献
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A line-to-plate reactor was set-up in the experimental study on the application of nanosecond pulsed corona discharge plasma technology in environmental pollution control. Investigation on the attenuation and distortion of the amplitude of the pulse wave front and the discharge image as well as the waveform along the corona wire was conducted. The results show that the wave front decreases sharply during the corona discharge along the corona wire. The higher the amplitude of the applied pulse is, the more the amplitude of the wave front decreased. The wave attenuation responds in a lower corona discharge inversely. To get a higher efficiency of the line-to-plate reactor a sharp attenuation of the corona has to be considered in practical design. 相似文献