Series Power Technology
Series Intermediate Frequency (IF) power supplies are suitable for furnace systems with power ratings between 500KW and 15,000KW. Our series IF power supplies feature fully open rectification, high power factor, minimal higher-order harmonics, high stability, low maintenance costs, and offer significant advantages over traditional IF power supplies.
Our unique design ensures high startup success rates, achieving full power output under any furnace condition, significantly enhancing the equipment's production efficiency. Multi-layer protection ensures the safety of the equipment. The series-connected medium-frequency power supply can implement one-to-one, one-to-two, and one-to-N melting systems to meet various different application needs.
The 12-pulse and 24-pulse multi-pulse design of the power cabinet further reduces higher-order harmonics. The design ensures current balance between the phases, implements soft start to prevent power surges, and quickly cuts off power in the event of a fault.
All signal transmission is achieved through optical fibers, offering strong anti-interference capabilities and a stable system. All components of the series-connected medium-frequency power supply are installed within enclosed cabinets. The power cabinet utilizes copper bars and pipes from a renowned domestic brand, with the copper bars being sandblasted, passivated, and manufactured to strict specifications. The arrangement of components in the power cabinet is rational, and the design is modular, making it easy to maintain and properly route wiring. Maintenance personnel have easy access to all maintenance points.
The power cabinet is equipped with a melting manager. The PLC and Human-Machine Interface combine to form a convenient melting manager with functionalities including: one-button melting, one-button holding, automatic kiln drying, cold kiln start-up, scheduled start, energy consumption statistics, refractory statistics, report generation, safety monitoring, fault diagnosis, fault information display and storage, operating information display, and system status display. A sealed isolation control room is located above the front door, containing the main control panel, feedback board, and control power components, allowing for convenient observation of the main control panel's signals. The isolation control room does not require additional cooling. The main electronic components of the power cabinet are cool, and the temperature rise within the cabinet during operation will not affect the isolation control room. Additionally, the selection of all electronic components on all electronic control circuit boards within the isolation control room is carried out according to high-temperature ratings.
The bridge rectifier section utilizes silicon-controlled rectifiers to convert AC power to DC, providing a stable DC platform for the inverter section. The capacitors are installed in a fully enclosed capacitor cabinet, constructed from high-strength cold-rolled steel plates. Equipped with differential current detection, DC injection, and two-electrode leak furnace test alarm circuits, indicator lights, leakage current meters, and detection control circuits, it continuously monitors during normal operation.
When the following conditions occur, shut off the power:
Metal penetrates through the furnace lining to the induction coil.
2. There is too much moisture inside the refractory lining.
Some electrical components exhibit low resistance to ground.
Due to the overall winding of the oxygen-free copper tube, the entire coil is protected by differential current, DC injection, and two-electrode leak furnace alarm circuits, covering both the effective and cold coils. The differential current method is an electronic protection that operates quickly, enabling rapid response when ground fault occurs in the output circuit. The DC injection leak furnace alarm is a non-electronic protection that is relatively slower, but it can still detect leaks when the power cabinet stops running. The two-electrode leak furnace alarm circuit is an independent protection device, unaffected by external factors, and offers one-to-one protection with high reliability and sensitivity.
