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Series Resonant Induction Furnace Technical Solution:

1. The system employs a six-phase dual-power supply with a “Y-Δ” 12-pulse rectifier, where the rectifier bridges are connected in series for output. This design reduces transformer losses, and the 12-pulse rectification effectively eliminates fifth- and seventh-order harmonics, significantly lowering harmonic distortion in the power grid. Furthermore, auxiliary equipment and medium-frequency power supplies in the factory can share the same transformer, eliminating the need to install an additional power source and thereby reducing capital investment in plant construction. Additionally, the voltage withstand requirements for rectifier components are lowered, which in turn reduces equipment maintenance costs.

The inverter employs series resonance, resulting in low switching losses. Compared to parallel resonance, it can save approximately 20% of power and boasts a 100% success rate in startup. This reduces investment in power equipment. Meanwhile, the series-resonant induction furnace uses low-voltage inverter components to achieve high-voltage output, thereby lowering equipment maintenance costs.

2. The power adjustment method employs rectifier voltage regulation and inverter power adjustment, and additionally utilizes our company’s rare combined power adjustment approach that integrates frequency and phase modulation. The overall power factor of the unit is exceptionally high, reaching cosφ ≥ 0.98, enabling the furnace to achieve full-power output under all operating conditions. This effectively shortens the melting cycle, increases the melting rate, and reduces heat loss from the furnace.

3. The load of the series resonant induction furnace employs a dual-power supply technology with a one-to-two configuration: the rectifier and filtering circuit are shared, while two inverters each supply power to one furnace body. The power output of the two inverter circuits is independently adjustable.

4. The transformer shall be a “Y△” double-winding transformer, or a combination of a “Y”-type transformer and a “△”-type transformer. The transformer’s total output power is 2000 kW.

5. The series resonant induction furnace features a hydraulic steel structure:

6. The power control system employs our company’s independently developed dedicated control system for the HK-CL12 series of frequency converters, which features powerful functionality, simple operation, and convenient use.