1SAP130100R0100

发布时间：2019-08-13 05:49:13

ABB PM571(1SAP130100R0100)

控制系统与电网的接地方式主要有三种，分别是共地方式、浮地方式、机壳共地与电路浮地。

    1.共地方式

    在共地方式中，PLC整个控制系以地面为参考，将机壳与接地点及接地线全部连在一起。大型工厂中有部分PLC系统采用了共地式的接地方式。在大地地位不易变动的地方，主要采用共地方式。大地电位稳定时，整个布线系统的电位也不会轻易产生变化，机壳接地的方式便会比较安全便于使用。

    2.浮地方式

    在大地电位不稳定的地方，大地地位变化大便会导致系统电位不稳定，PLC布线中的线路则会受到很大的干扰，这种情况下则采用浮地方式较为妥当。在PLC控制系统中，机壳与电路接地点相连，并且悬浮在空中而不接触地面，主要采用绝缘胶垫以便在机壳与大地之间隔开。同时要对进线采用绝缘措施。浮地方式的接地措施也可以有效的避免干扰，大地电位变化与电磁感应的干扰因此而大大减弱。但这种方式的缺点是由于整个系统线路采用浮地方式，因此机壳上会起静电，操作起来存在一定的***。

    3.机壳共地、电路浮地

    这种方式是共地方式与浮地方式的结合。这种方式具有显而易见得优点，因为机壳接地，所以操作上较为安全，而同时因为接地点***，便可减弱大地电位变化产生的扰动效应。这种接地方式无论从安全生产的角度，还是保护设备的角度，都具有其合理性与明显优势，因此在炼铁厂得到广泛的应用

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