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Adopt a dual-source power control system to enhance... Medium-frequency electric furnace For the melting rate, use a power-frequency rectifier transformer with equal or slightly larger capacity, driven by two variable-frequency power supply systems to power two furnaces.

Experimental results show that the total effective power of a single induction furnace often cannot be fully utilized throughout the entire melting process. During molten iron temperature measurement, sample collection and analysis, composition adjustment, slag removal, and especially during electroslag refining, it is essential to reduce the effective power or even disconnect the power supply. If the main casting cycle is relatively long, the utilization rate may drop to only about 50% to 70%. To achieve the desired production rate, enterprises would need to increase the number of medium-frequency induction furnaces and boost the load on the power supply at industrial frequency, leading to higher initial investment costs and increased operational expenses in the later stages. By adopting a medium-frequency induction furnace system featuring a single power source, a single furnace body, and a single transformer—where one furnace melts the molten iron and prepares it for pouring, while its variable-frequency power supply immediately switches to standby mode for insulation—another set of variable-frequency power supplies can simultaneously drive another furnace filled with fresh charge material, enabling full-power melting. In this way, the utilization rate of the medium-frequency induction furnace reaches 100%. Such equipment can supply power to two furnaces either independently or concurrently, eliminating the need for switching operations. Moreover, during smelting, there is no longer any requirement to switch power between furnaces just to maintain the necessary pouring temperature. Large-scale induction furnaces typically have lengthy drying times. By employing a power-source-furnace-body-transformer system, even if one furnace has completed its drying cycle, the other furnace can continue operating normally, ensuring a timely and continuous supply of molten iron, thereby boosting productivity, improving equipment utilization, reducing energy consumption, and achieving continuous furnace drying.
High power Medium-frequency electric furnace When power is reduced during adiabatic operation, the power factor becomes very low. However, high-power medium-frequency furnaces typically operate using a voltage-doubling circuit. During adiabatic treatment, the doubled voltage can be converted into a flat voltage, thereby reducing the power to one-fourth. Additionally, by incorporating reactive power compensation and harmonic mitigation devices, the power factor can be maintained within acceptable limits.
It should be noted that, as mentioned earlier, the thyristors within the 60-watt, 10-ton furnace charge are controllable. Intermediate-Frequency Induction Furnace for Series Resonance The technology and complete sets of equipment have become increasingly reliable. The 3-ton thyristor-series resonant medium-frequency induction furnace, manufactured abroad, is now produced by foreign suppliers. Thyristor-series resonant medium-frequency induction furnaces can achieve a one-to-two power-sharing configuration for two furnaces simultaneously; however, the equipment is expensive.