Design of power monitoring system for 33MW DC submerged arc furnace based on PLC

This paper introduces a monitoring system of 33MW submerged arc furnace DC energy saving power supply equipment. The energy saving equipment is equivalent to 36 pulse waves at the side of high voltage grid when running. Three sets of independent 12-pulse thyristor rectifier links are used to supply DC power to 33MW submerged arc furnace through six electrodes. S7-200 Smart PLC and WinCC monitoring configuration software are used to realize the design of the monitoring system, and the monitoring system uses industrial Ethernet and point-to-point interface (PPI) communication protocol to achieve the precise and rapid control of the power supply system of 33MW mining furnace, realizing the digitization and intelligence. The field debugging and application results show that, the monitoring system has a good man-machine interface, high degree of automation, and can run efficiently, stably and safely.