A kind of reasonable low-voltage reactive compensation scheme is designed by way of comprehensive analysis of three kinds of reactive compensation modes of submerged arc furnace. The design scheme

switching base and calculation of related key parameters concerning low voltage side compensation are especially analyzed

and the new combined capacitor switching switch which is suitable for lowvoltage dynamic reactive power compensation system of submerged arc furnace is selected. It is shown by the actual project that this scheme can effectively enhance the power factor

reduce energy consumption of the system and can be used as reference for the design of reactive power compensation system of submerged arc furnace.