1746-OB32 PLC输出模块

1746-OB32

手车和抽屉分别是高压开关柜和低压开关柜的一部分，分别安装高压断路器和低压断路器及其继电器等元器件。由此划分出手车式开关柜(高压)和抽屉式开关柜(低压)，他们与固定式开关柜的功能是基本相同的，主要区别是方便了维护和检修(手车和抽屉都可以通过机械操作机构摇把来推进、拉出)。手车和抽屉一般都有工作(正常运行时)、试验(试投运和现场试验时)和退出(维护、检修时)三种位置状态。

接地刀(也叫接地开关)主要：一是用来在线路和设备检修时，为确保人员进行接地用的；二是可以用来人为地造成系统的接地短路，达到控制保护的目的。第一个作用很好理解，不做介绍。第二个作用是这样的：接地刀通常是接在降压变压器的高压侧，当受电端发生故障或者变压器内部故障时，接地刀开关应自动闭合，造成接地短路故障，迫使送电端(上端)断路器迅速动作，切断故障，所以说这是个人为的接地短路故障，目的就是保证送电端的断路器能够快速动作。

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