504 / 2017-05-10 21:33:49

Research on the Influence factors of Arc Characteristics in the Arc extinguish chamber in DC contactor Breaking Process

13941,13978,13979,2696,13980

The structure of the arc extinguishing device has a direct influence on the arc extinguishing performance of the contactor. At present, the influences of different arc extinguishing devices on the arc extinguishing performance are basically clear. Compared with AC contactor, research on DC contactor in this area is relatively less. In this paper, the dynamic characteristics of the arc plasma in the arc chamber in the process of DC breaking are studied. Based on magnetohydrodynamics theory (MHD), the arc model in the chamber of DC contactor was established by finite element software. The effects of the structure of the different arc quenching chamber, the position of metallic plates, the structure of metallic plates and the shape of arc runners on the arc quenching performance are respectively studied by means of the coupling loop equation. The simulation describes the process that the arc moves along arc runners to the metallic plates and is eventually cut off by the metallic plates. Through the arc voltage and current curve, the temperature field distribution, the distribution of electric field, the electric conductivity and the pressure distribution, the relationships between the different arc extinguishing devices and the arc root motion, the arc stagnation, the arc splitting and the arc extinguishing time are revealed under the same load condition. And the relationships between the different load conditions and the arc root motion, the arc stagnation, the arc splitting and the arc extinguishing time are also revealed in the same arc extinguishing device. The applicability of different arc extinguishing devices for DC contactor with different breaking levels is studied. The arc voltage and current curves measured in the test are consistent with the simulation results under the same conditions, which proves that the research can provide a theoretical basis for the design and optimization of DC contactor arc extinguishing system.