Scope Of Application: Generator, Inverter / Converter
Packaging & Delivery
Selling Units
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Piece/Pieces
Package Type
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Steel Case/ Wooden Case
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Product Description
The rectifier element always remains fully open during operation, converting AC power into DC power without the need for power adjustment. When overcurrent or overvoltage occurs, it quickly shuts off to achieve timely protection. By using a rectifier bridge to adjust the output power, a constant power output can be obtained during the smelting process to shorten the smelting time, save electricity, and improve economic benefits. It has a high power factor throughout the entire operation process. Because the use of rectifier circuits always results in full voltage output or control angle during operation α= 0 °, and the harmonic interference to the power grid is minimized. The electrical components are designed reasonably, arranged neatly, and maintenance and replacement of parts are convenient and fast. All major heating components and copper bars are equipped with reasonable water cooling as needed. In rectifier circuits, the commonly used three-phase fully controlled rectifier circuit belongs to six pulse rectification, which means that the DC voltage Ud of the power supply has six pulse waves within one week. The input current of the rectifier power supply in this circuit is a symmetrical square wave current with a width of 120 °, which includes many harmonic currents in addition to the fundamental wave. Harmonic current has both advantages and disadvantages. On the one hand, it increases the eddy current loss of the rectifier transformer core, and on the other hand, it can cause overheating of capacitive loads and other loads with electromagnetic cores connected to the AC power grid, causing interference to wired broadcasting and telecommunications. Additionally, it can cause additional errors in precise measuring instruments connected to the AC power grid. To reduce the interference of high-power rectification devices on the power grid, two methods can be adopted. One is to add a filter to provide a path for high-order harmonic currents, thereby reducing the impact of high-order harmonic currents on other electrical components. However, due to the high cost of filters, they are generally not used; Another more effective way is to increase the number of rectifying phases, that is, to increase the number of voltage pulses. In a typical three-phase 6-pulse bridge rectifier circuit, the transformer current is square wave. During work, harmonic interference currents of 3rd, 5th, 7th, 11th, 13th, and higher orders are generated on the power grid. The magnitude of these harmonic currents is 1/3, 1/5, 1/7, 1/11, and 1/13 of the power frequency fundamental current, respectively. If three-phase 6-pulse bridge rectifier lines are used, the harmonic interference generated during their operation may cause local power grid harmonics to exceed the standard or cause certain precision equipment and instruments to malfunction. After using a six phase 12 pulse bridge rectifier circuit, the transformer current is close to a sine wave. Due to the special connection method of transformers, the 3rd, 5th, and 7th harmonic currents will cancel out each other inside the transformer, thereby significantly reducing its harmonic interference on the power grid. The lowest harmonic of a 12 pulse bridge rectifier circuit is the 11th harmonic, which is 1/11 of the power frequency fundamental current, and the 13th harmonic is 1/13 of the power frequency fundamental current.
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