厦门岳航计算机工程有限公司

5A28137G04西屋

  DCS系统接地方式 DCS系统一般接地方式

    (1) 利用电气接地网作为DCS接地网，即与电气接地网共地； 
    (2) 设DCS系统专用独立的接地网；
    (3) 设DCS专用接地网，经接地线、再接至电气接地网；

    由于第三种接地方式与第二种接地方式有较多相同处，过去，计算机或DCS系统曾经较多的采用过专用的接地网。但这种接地方式存在的缺点是：占地面积太大，投资高，电缆及接地网钢材耗量大，距厂房有相当的距离（因不易在厂房内找到合适的位置），管理、维护、测量及查找接地极和接地线不方便，且效果不甚良好。根据实际运行表明，设置专用的DCS接地网是既困难又不安全的。如某电厂曾因接地问题，造成机组跳闸数十次。根据调查，不少电厂DCS后来改用电气接地网接地，取得了良好的效果。

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