描述
公用系统控制方式
对于2台机组的公用系统,如厂用公用及备用电源系统等与热工控制系统一样,DCS的配置能够实现机组停止时,另一台机组的运行人员能对公用系统进行监控,并且要求采用可靠的措施,确保其控制命令的唯一性,即在同一时间只允许一套DCS系统对公用设备起控制作用。不能因为公用系统的存在,而使2台机组的DCS耦合在一起。
在工程实际应用过程中,依照DCS的特点采用了2种典型的方法来实现对公用系统的控制。九江三期的DCS是HITACHI公司生产的HIACS7000系统,在DCS的配置中,我们在2台机组中配置相同的硬件和软件,通过切换开关来实现操作权的转换。外部设备的信号通过冗余配置(模拟量)或通过扩展转换(开关量)分别送入2套DCS系统。同时因保证不出现误操作事故,还增加了相当部分的判据条件和I/0测点,这种方式的优点是当一台机组停运或检修,可以较方便地对DCS进行检查,同时也增大了控制的可靠性,缺点是增加了外部设备的数量,增加了费用。增加一个环节也就意味着增加了故障发生的可能。信阳一期、益阳一期的DCS是由Bailey公司提供的INFI-90系统,针对其系统结构采用了公用环,公用系统的控制全部通过公用环配置来实现。2套DCS通过Tagnumber来实现控制,这样较好地解决了耦合问题。这种控制方式的优点是配置较少,外部设备也不用增加,有效地利用了信息资源;缺点是公用环的设备不能停电检修,除非2台机组均停机检修,加重了设备运行安全性的要求。
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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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