分/合闸电磁铁智能控制模块的设计

Design of the Intelligent Control Module Used for the Breaking and Closing Electromagnet

针对断路器分合闸线圈的烧毁故障问题,引入数字电源技术,设计了分/合闸电磁铁智能控制模块。对分/合闸电磁铁的线圈电流进行闭环斩波控制,从根本上改变了分/合闸电磁铁的激磁方式,并严格控制激磁时间及激磁电流,不仅防止了线圈的烧毁故障,同时分/合闸电磁铁的动作特性不受交流合闸相角的影响,可以在宽电压范围内对线圈电流进行精确控制,提高了分/合闸电磁铁动作特性的一致性,进而提高了断路器分/合闸操作的可靠性。

For some reasons,the coil of the electromagnet often burns,and it seriously affects the reliability of the distribution system. This paper introduced the digital power supply technology and designed an intelligent control module for the breaking and closing electromagnet to control the coil current with a closed-loop. Therefore,the way of the electromagnet exciting can be fundamentally changed. The module can control the exciting time and the exciting current of the coil accurately. With these measures,the coil burning can be avoided,and the operation characteristics of the electromagnet are not affected by the AC phase angle. The coil current can be accurately control over a wide range of input voltage,and it improves the consistency of the operation characteristics,so the operation reliability of the breakers can also be improved.