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Abstract
The DC load switch which relies on the rapid increase of arc voltage to realize natural commutation is actively promoted in the flexible DC distribution network. When it is disconnected, there will be an arc in the gas arc chamber. The arc voltage directly determines the speed and success or failure of commutation. It is proposed to apply the gas arc chamber with metal grid to the main flow branch of natural commutation DC load switch. Based on magnetohydrodynamics (MHD), the arc model of gas arc chamber with metal grid is established by finite element method, and the segmentation of arc by metal grid is realized by assuming the plasma sheath, Then the calculation of the rapid rise process of arc voltage is realized. Through the temperature field distribution and arc voltage variation curve in the arc chamber, the process of helium arc moving along the arc channel and being cut by metal grid under the action of magnetic field is analysed, and then the feasibility of rapidly increasing the arc voltage by using this scheme is revealed. The research results provide some theoretical guidance for the design of natural commutation direct current load switch.
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