基于Multisim的三相电路仿真分析

在生产与生活中三相电路的应用最为广泛，针对三相电路运行工况的实验就显得重要而且必然，然而实际的三相电路实验不仅危险性较大，而且一些故障性试验较难进行。电路仿真软件Multisim提供了适用于三相电路仿真的各种元件模型及分析工具，利用该软件对三相电路的3种不对称短路故障进行了仿真分析，与理论分析比较的结果表明仿真软件效果理想。通过虚拟实验分析了负载变化对三相电路的影响，从而得出了照明线路为保持各相电压不变一般采用三相四线制的结论。两组实验表明利用Muttisim可以方便快捷地对三相电路进行各种实验分析。优点明显．适合在电工实验中推广。

Simulation of Three-phase Circuits with Multisim

The three- phase circuit is applied to production and life extensively,so the experiments of it are important and necessary, nevertheless the experiments are not only very dangerous ,but also some of fault experiments are relatively hard to do. A circuit simulation software Multisim offers many components and instruments which are applicable to the three-phase circuit. By using this software .three unbalanced short faults of the three -phase circuits are analyzed. Compared with the theory,the simulative results are satisfying. Infection to the circuits due to the change of three-phase loads is demonstrated through dummy experlments,thereby elicits that illuminative circuits commonly adopt three-phase four-wire system in order to keep each voltage invariable. The two experiments indicate that Multisim can analyze three-phase circuits conveniently and quickly,and it has obvious advantages and fits to apply in the electric experiment.