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Parallel Medium Frequency Power Supply

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Release time:

2018-09-28

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In furnace systems with power greater than 10,000 kilowatts, we use parallel resonant power supplies. Compared to series resonant power supplies, parallel resonant power supplies offer higher safety in ultra-high power sources. Our unique parallel resonant design ensures that when power exceeds 40%, the rectifier is fully open, achieving the highest power factor and lower harmonic distortion, providing significant advantages over traditional parallel power supplies.
　　Our unique design guarantees a 100% startup success rate. Even under high power conditions, it ensures the coil design voltage remains within a reasonable range, ensuring equipment safety. High-power parallel power supplies can form a one-to-one melting system or, through external high-capacity pneumatic switching switches, select the furnace body, conveniently realizing one-to-two or two-to-three switching melting systems to meet various application needs.
　　The power cabinet's 12-pulse and 24-pulse multi-pulse designs further reduce higher harmonics. The unique rectifier trigger board design ensures current balance among each phase input line, while implementing soft start to prevent power surges and quickly cutting off power in case of faults.
　　Digital signal transmission is entirely realized through optical fiber, providing strong anti-interference capability and making the system more stable. All components of the parallel resonant medium-frequency power supply are installed inside a sealed cabinet. The copper bars and copper pipes inside the power cabinet use well-known domestic brands; the copper bars are sandblasted, passivated, and manufactured according to standards. The layout of components in the power cabinet is reasonable, easy to maintain, with standardized wiring and cabling. Maintenance personnel can easily access all maintenance points.
　　The power cabinet is also equipped with a melting manager. The PLC and human-machine interface form a convenient melting manager with functions including automatic furnace drying, cold furnace startup, fault diagnosis, fault information display and storage, operation information display, and system status display. A sealed isolated control room is arranged at the upper part of the front door, equipped with main control boards, feedback boards, power control, and other control components, allowing easy observation of the main control board signals. The isolated control room requires no additional cooling. The main electronic components of the power cabinet are cooled by ice, and the temperature rise inside the cabinet during operation does not affect the isolated control room. All electronic components on the electronic control circuit boards inside the isolated control room are selected according to high-temperature ratings.
　　Equipped with a full-function incoming line air switch protection system. A fast-acting full-function circuit breaker (air switch) is installed on the front of the power supply, operated by an electric operating mechanism, with a 24V undervoltage coil for interlock protection, and includes overcurrent protection. When overcurrent occurs, it trips to protect by cutting off the incoming power supply to the power cabinet. The bridge rectifier section converts AC to DC, providing a stable DC platform for the inverter section. Capacitors are installed inside a fully enclosed capacitor cabinet made of high-strength cold-rolled steel plates. It is also equipped with differential current and DC injection type furnace leakage test alarm circuits, indicator lights, leakage current meters, and detection control circuits. During normal operation, it continuously monitors.
　　The power supply is shut off under the following conditions:
　　1. Metal penetrates the furnace lining to the induction coil;
　　2. Excessive moisture inside the furnace lining;
　　3. Individual electrical components have low resistance to ground.
　　Since the coil is wound integrally with oxygen-free copper tubes, the differential current method and DC injection type furnace leakage alarm circuit protect the entire coil, including the effective coil and the cold coil. The differential current method is an electronic protection with fast response; when a ground flashover fault occurs in the output circuit, the differential current protection responds at the fastest speed. The DC injection type furnace leakage alarm is a non-electronic protection with relatively slower speed, but it can detect furnace leakage even when the power cabinet stops running.