The DC-LF furnace type is DC-LF-40, and the nominal capacity of ladle is 40 tons. The system is composed of high-voltage power supply circuit, rectifier transformer, rectifier cabinet and secondary electrode horizontal arm lifting system. The rectifier transformer is a three-coil three-phase forced-oil circulating water-cooled electric furnace transformer with a rated capacity of 7000KVA, a high-voltage side rated voltage of 10000V, a low-voltage side of four-stage no-load voltage regulation, and a low-voltage side rectifier DC current rating of 2100A (RMS). The rectifier cabinet system adopts three-phase reverse parallel full-bridge high-power water-cooled diode rectification, and a single rectifier diode is rated to 2000A (average).

The secondary horizontal arm lift automatic control system is a full-hydraulic follow-up control system, and an excellent linear operation amplifier XFC-60 is used as a comparator operation amplifying element to ensure the reliability of the automatic control system. Features and problems. According to the characteristics of the DC arc, it can be seen that under the same input power and arc voltage conditions, the DC arc transfers more heat to the molten steel than the AC arc, so its thermal efficiency is high. However, at the same time, the length of the DC arc is also longer than that of the AC arc (DC arc tN arc voltage U), and the amount of heat radiated around the ladle also increases.

In the presence of DC bias, the local refractory surface of the ladle refractories is locally eroded and the damage is eroded. In particular, the DC-LF furnace of the branch is smelted by two electrodes, the electrodes are near to the refractory material of the ladle wall, and the service life of the refractories caused by partial arc changes. More serious. DC-LF furnace automatic control system is the first to use the operational amplifier model XFC-60 (ordinary type), and the damage rate is extremely high during operation. The main reason is that it withstands frequent short-circuit current during the arc starting phase, impact ability and anti-clutter interference. Poor capacity, has now switched to military-type XFC-78B, and adds a 0.1LF/160V metal film capacitor at the input to suppress it. The improved system operation is very reliable, and the operational amplifier XFC-78B has less than one damage per year. , to ensure the smooth progress of the smelting.

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