To design the size of the ceramic cover for a DC contactor,it is necessary to study the curve changes of arc voltage and current and the arc motion during the arcing process of the DC contactor.A certain type of DC750 V/300 A non-polar DC contactor is used as the carrier.First,the Fluent software is secondarily developed based on the magnetohydrodynamic(MHD)arc transient mathematical model and Fluent dynamic mesh technology.Second,a three-dimensional arc simulation model is built,and the three-dimensional arc motion of the DC contactor is calculated.Finally,arc experiments and simulations are conducted to observe the ablation of the prototype after the test.The simulation and experimental results show that the arc voltage and current curves obtained from the simulation can accurately present the trend of the experimental curves,and the accuracy of the simulation results is verified.At the same time,by observing the temperature field results of the simulation,the burning shape of the arc inside the ceramic cover can be clearly observed.The results of the proposed model can provide a reference for the product design and arc extinguishing research of non-polar DC contactors.
关键词
三维电弧仿真/直流接触器/电弧运动形态/燃弧时间
Key words
three-dimensional arc simulation/DC contactor/arc motion pattern/arcing time
维普
万方数据