Characterization of a 3-Phase a.c. Free Burning Arc Plasma

A 3-phase a.c. arc plasma reactor with large volume plasma has been developed for the synthesis of new carbon nano-structures. One of the main characteristics of the plasma system is related to the absence of a fixed neutral point. This gives rise to a rich and complex phenomenology related to instabilities and arc motion since the arcs are ＂burning＂ freely in the gas flow between the three electrodes. This paper is dedicated to the analysis of the behavior of such a system under typical conditions using argon and nitrogen as plasma gases. A classification of are configuration, arc commutating, arc interaction, arc motion and arc instabilities are discussed based on ultra high-speed cine camera analysis. A simple model describing the time evolution of the system is also presented and compared with the experimental measurements. The results show that an adequate control could allow the improvement of the overall system.

Multisim仿真软件在三相交流电路实验中的应用

三相交流电路广泛的应用于我们的日常生活和生产领域,所以针对三相交流电路的工作情况进行实验很有必要,然而在实验室进行三相交流电路实验时有较大的危险性,一些短路断路的实验也较难进行。电路仿真软件Multisim提供了适用于三相交流电路仿真的各种元件模块及测试工具,利用该软件对三相交流电路进行仿真,与理论分析的结果一致。实验表明利用Multisim对三相电路进行各种实验分析很方便准确,可以在今后的电工实验中得以推广。