NF93A-2HESG440280R2HESG323662R1/HESG216665/K自动化设备

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DCS外部条件指ups电源、计算机控制系统接地、控制室和电子室环境要求等。电厂在安装和调试期间，由于抢工期或其他因素，这些情况往往被忽视，但外部条件好坏却直接威胁到DCS安全、稳定运行，通过对DCS问题分析可知，很多事故、故障等就是由于UPS电源及系统接地不好等原因引起的。DCS没有良好的接地系统和合理的电缆屏蔽，不仅系统干扰大，控制系统易误发信号，还易使模件损坏。可见，UPS电源、控制系统接地、控制室和电子室环境要求等外部条件不好给电厂投产后DCS的安全，稳定运行留下极大隐患。因此，DCS系统电源设计一定要有可靠的后备手段，负荷配置要合理并有一定余量;DCS的系统接地必须严格遵守技术要求，所有进入DSC系统控制信号的电缆必须采用质量合格的屏蔽电缆，并要同动力电缆分开敷设且有良好的单端接地;还要制定严格的管理制度如电子间出入登记、文明卫生等管理制度，定期消除灰尘、每天进行环境检查，定期对DCS系统接地进行测量，对DPC冗余切换、DPU及保安电源冗余切换进行试验等，以确保DCS外部环境条件状况良好。所以DCS投运前要做好一系列外部环境的检查，满足有关条件后再上电、投运。External conditions of DCS refer to UPS power supply, grounding of computer control system, environmental requirements of control room and electronic room, etc. During the installation and commissioning of the power plant, these situations are often ignored due to rush for construction period or other factors, but the external conditions directly threaten the safe and stable operation of DCS. Through the analysis of DCS problems, it can be seen that many accidents and faults are caused by poor UPS power supply and system grounding. DCs has no good grounding system and reasonable cable shielding, which not only has large system interference, the control system is easy to send signals by mistake, but also easy to damage modules. It can be seen that the poor external conditions such as UPS power supply, control system grounding and environmental requirements of control room and electronic room leave great hidden dangers for the safe and stable operation of DCS after the power plant is put into operation. Therefore, the power supply design of DCS system must have reliable backup means, and the load configuration must be reasonable and have a certain margin; The system grounding of DCS must strictly comply with the technical requirements. All cables entering the control signal of DSC system must adopt qualified shielded cables, which shall be laid separately from the power cables and have good single ended grounding; It is also necessary to formulate strict management systems, such as electronic room access registration, housekeeping and other management systems, regularly eliminate dust, conduct environmental inspection every day, regularly measure the grounding of DCS system, and test the redundant switching of DPC, DPU and security power supply, so as to ensure that the external environmental conditions of DCS are in good condition. Therefore, before DCS is put into operation, a series of external environment inspections shall be carried out, and the DCS shall be powered on and put into operation after meeting relevant conditions.