自动门
自动门:低压断路器
发布时间:2014/1/21
自动门讯:
低压断路器,是一种既有手动开关作用又能自动进行欠电压、失
  电压过载和短路保护的电器,它在低压配电系统中起着非常重要的
  作用。低压断路器通常用于不频繁地接通和分断电路,也可以用来
  控制电动机。低压断路器与接触器不同的是:接触器可以频繁地接
  通或分断电路,但不能分断短路电流;低压断路器则不仅可以分断
  额定电流.
     1)按用途分。有保护配电线路用、保护电动机用,保护照明
线路用和漏电保护用等。
    2)按主电路极数分。有单极、两极、三极、四极断路器,小型断路器还可以拼装组
成多极断路器。
    3)按保护脱扣器种类分。有短路瞬时脱扣器、短路延时脱扣器、过载长延时反时
限保护脱扣器、欠电压瞬时脱扣器、欠电压延时脱扣器、远方紧急跳闸用分励脱扣器、
漏电保护脱扣器等。上述各种脱扣器可以根据需要选择并组装在断路器上。
    4)按劫作方式分。有直接手柄操作、手柄储能操作快速合闸、电磁铁操作、电动机
操作、电动机储能操作快速合闸等。
    5)按结构型式分。有塑料外壳式、框架式等两种。
    在一般的电气控制系统巾通常选用塑料外壳式断路器。断路器的主要技术参数有额定
电流、额定电压、极数、允许分断的极限电流、脱扣器的种类及整定值等。在设计时根据
被控电路的额定电压、短路容量、负载电流大小等参数选择断路器的型号规格,这里要求
所选用的断路器的额定电压和额定电流不小于电路的正常工作电压和工作电流;极限分断
能力要大于电路的最大短路电流l欠电压脱扣器额定电压应等于主电路额定电压;热脱扣
器的整定电流与所控制电动机或负载的额定电流相等;电流脱扣器的瞬时脱扣整定电流应
大于负载电路正常工作时的尖峰电流,保护电动机时取其启动电流的1.5倍。

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