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    中频炉大容量滤波电抗器的技术要求

    中频炉波电抗器对固体电源是非常重要的,它有二个作用。第一使整流器的输出电流变得平滑稳定。第二当逆变可控硅直通短路时,限制短路电流的增长速度和最大短路电流的大小。如果滤波电抗器的参数设计不合理,铁芯材料不好或制造工艺不过关,将对固体电源的工作可靠性产生极大影响。

    了确保滤波电抗器的参数合理,专门开发了滤波电抗器设计软件包,软件设计时,特别考虑了并联逆变条件下滤波电抗器的工作环境,同时依据我们生产固体电源十余年的经验而编制。它可以充分优化滤波电抗器的参数,特别是,它能够分析电流从0到3倍额定电流范围内滤波电抗器的参数变化,确保通过滤波电抗器的电流为3倍额定电流时铁芯不会磁饱和。因为,当中频炉逆变可控硅直通短路时,通过滤波电抗器的电流远大于额定电流,这时,如果滤波电抗器的铁芯磁饱和,滤波电抗器将失去限流作用。所以,必须保证当电流大于额定电流时,滤波电抗器铁芯仍不会磁饱和。只有这样,滤波电抗器才具有良好的限流作用,保证最大短路电流被限制在合理范围内。

    波电抗器的硅钢片采用的是冷轧高导磁率产品,铜管为T2挤制铜管,用高强度云母带包扎,H 级绝缘。

    了减小滤波电抗器的工作噪音,硅钢片采取了特别的紧固工艺,在硅钢片和气隙之间还填充有专用的缓冲吸音材料。

    Technical requirements for large-capacity filter reactors for induction melting furnaces

    Induction melting furnace filtered Reactor solid power is very important, it has two functions。 First, the output current of the rectifier is made smooth and stable。 Second, when the inverter thyristor is short-circuited, the growth rate of the short-circuit current and the maximum short-circuit current are limited。 If the parameter design of the filter reactor is unreasonable, the core material is not good or the manufacturing process is not good, which will have a great impact on the reliability of the solid power supply。

    To ensure reasonable parameters filter reactor, specially developed filter reactor design software package, the software design, especially considering the filter reactor working environment Parallel Inverter conditions, and in accordance with our production of solid power more than ten years Prepared by experience。 It can fully optimize the parameters of the filter reactor。 In particular, it can analyze the parameter variation of the filter reactor in the current range from 0 to 3 times the rated current, ensuring that the core will not pass when the current of the filter reactor is 3 times the rated current。 Magnetic saturation。 Because, when the induction melting furnace inverts the thyristor through-short, the current through the filter reactor is much larger than the rated current. At this time, if the core of the filter reactor is magnetically saturated, the filter reactor will lose the current limiting effect. Therefore, it must be ensured that the filter reactor core is not magnetically saturated when the current is greater than the rated current. Only in this way, the filter reactor has a good current limiting function, ensuring that the maximum short-circuit current is limited to a reasonable range.

    Filtered Reactor uses a cold-rolled silicon steel of high magnetic permeability products, extruded brass is T2 brass, high-strength mica tape wrap, H grade insulation。

    As a filter to reduce the operating noise of the reactor, silicon taken special fastening process, the air gap between the silicon and the buffer is also filled with a special sound-absorbing material.


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