描述
DCS接地分类在一般情况下,DCS控制系统需要两种接地:保护地和工作地(逻辑地、屏蔽地等)。对于装有安全栅防爆措施的系统如化工行业所用的系统,还要求有本安地。2.1保护地(CG,Cabinet Grounding)
是为了防止设备外壳的静电荷积累、避免造成人身伤害而采取的保护措施。DCS系统所有的操作员机柜、现场控制站机柜、打印机、端子柜等均应接保护地。保护地应接至厂区电气专业接地网,接地电阻小于4Ω。2.2逻辑地
也叫机器逻辑地、主机电源地,是计算机内部的逻辑电平负端公共地,也是+5V等的电源输出地。如CPU的正负5伏、正负12伏的负端。需要接入公共接地极。2.3屏蔽地(AG,Analog Grounding)
也叫模拟地,它可以把现场信号传输时所受到的干扰屏蔽掉,以提高信号精度。DCS系统中信号电缆的屏蔽层应做屏蔽接地。线缆屏蔽层必须一端接地,防止形成闭合回路干扰。铠装电缆的金属铠不应作为屏蔽保护接地,必须是铜丝网或镀铝屏蔽层接地。接入公共接地极。2.4本安应独立设置接地系统,接地电阻≤4Ω。本安地的接地系统应保持独立,与厂区电气地网或其它仪表系统接地网的距离应在5m以上。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。
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