新型低压控制电器中电子元件的应用

常用新型新型电子式无触点低压电器有接近开关、温度继电器、固态继电器和光电继电器。其中固态继电器(SSR)是近年发展起来的一种新型电子继电器,具有开关速度快、工作频率高、质量轻、使用寿命长、噪声低和动作可靠等一系列优点,其中的电子元件光耦合器、光敏晶体管、晶体管、晶闸管、双向晶闸管等都起到重要作用。目前新型电子式无触点低压电器产品有电子式稳压器(数控无触点式)和DETSC低压动态无功补偿装置。新型低压控制电器存在问题有低压断路器进线方向与断流容量问题,新型电力稳压器的触发驱动问题和晶闸管阻断问题。

The new electronic contactless low-voltage relays are proximity switches, temperature relays, solid-state relays and photoelectric relays. Solid state relay (SSR) is a new type of electronic relay developed in recent years. It has a series of advantages, such as fast switching speed, high operating frequency, light weight, long service life, low noise and reliable operation. Among them, electronic components such as optical coupler, photosensitive transistor, transistor, thyristor, bidirectional thyristor, etc. Both play an important role. At present, the new electronic contactless low-voltage electrical products include electronic regulator (NC contactless) and DETSC low-voltage dynamic reactive power compensation device. There are some problems in the new type of low-voltage control apparatus, such as the direction of low-voltage circuit breaker feeding and the capacity of breaking current, the trigger driving problem of the new type of power regulator and the thyristor blocking problem.