What is series resonant dual power supply?
Writer： Hengfeng you electric Time：2023-05-09 views：times
Design and application of series resonant double output intermediate frequency power cabinet
At present, China's smelting industry has been pursuing a reliable, energy-saving and fast medium frequency smelting furnace. The design of series resonance can easily realize the multi power supply of smelting system, which is the most common and typical dual power supply system. The series resonant double output power cabinet, two furnace bodies constitute one or two electric furnace smelting systems, and the output power can be continuously and arbitrarily distributed between two and two furnaces on the furnace body, which can be used for power transmission of one furnace, heat insulation of one furnace and melting of the other. There is no need to use an external switching device to select the furnace body. Our series resonance design ensures that the equipment is continuous and stable operation, and has a wide range of load matching. The rectifying part of the power cabinet adopts the fully open design, with high power factor and small harmonic. 12 pulse and 24 pulse pulse are designed to further reduce harmonic. Special rectifier trigger board is designed to ensure phase balance current between lines. Meanwhile, soft start power supply is implemented to prevent impact and quickly cut off power failure. All digital signal transmission is realized through optical fiber, with strong anti-interference ability and more stable system.
All equipment of series resonant double output intermediate frequency power supply is installed in a closed cabinet. Domestic brands use copper, copper power cabinet and copper for sandblasting, passivation and production specifications. The reasonable arrangement of power cabinet components is convenient for maintenance, wiring and wiring specification. Maintenance personnel can easily access all maintenance points. An isolation switch is set between the rectifier and the inverter. In case of fault on one side of the inverter, isolate the fault and continue to work with the power supply on the other side. Provide power cabinet for smelting manager. Smelting manager, programmable controller and man-machine interface form a convenient operation function, including automatic oven, cold start, fault diagnosis, fault information display and storage, operation information and system status display.
A closed isolation control room is set at the upper part of the front door, including the main control board, feedback board, control power supply, etc., and the signals of the main control board can be easily observed. The isolated control room does not require additional cooling.
The main power supply of the power electronic device is water-cooled, and the temperature rise during operation in the cabinet will not affect the isolation control room. Meanwhile, all electronic components in the electronic control circuit board are selected according to the high temperature level.
Air switch protection system with full function. The quick action function (air switch) of the circuit breaker is installed in the positive power supply. It is an electric operating mechanism. The pressure loss plays a protective role of the 24V interlocking coil, and it has over-current protection and tripping protection in case of over-current to cut off the power supply of the power supply cabinet. The bridge rectifier converts AC power into DC power and provides a stable DC platform for the inverter. Two sets of series resonant inverter bridges, the output power can be arbitrarily distributed between the two series resonant inverter bridges. The two sets of series resonant capacitor compensation devices meet the requirements of double output and can be used for double furnaces at the same time. The capacitor is installed in a fully enclosed capacitor cabinet and is made of high-strength cold-rolled steel plate.
At the same time, it is also equipped with differential current mode and DC injection leakage test alarm circuit, indicator light, leakage current meter and detection control circuit. In normal operation, it is continuously detected. Turn off the power when the following conditions occur:
1. Furnace lining drill iron;
2. Excessive humidity of furnace body;
3. Poor internal insulation of power supply;
4. All events that may cause leakage will be detected in time and the equipment will be stopped, with high safety.
The inner surface of "hedgehog coil" Keda coil is welded with screws. When molten iron penetration occurs, the probe can detect the leakage in advance, preventing the damage caused by molten iron burning the coil and increasing the adsorption strength of the coil slurry.
For more information, please pay attention to Qingdao hengfengyou electric. Our factory focuses on the production and manufacturing of American box type substation, which has been sold to the American market in 2018.
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