1738-OB4EM8

1738-OB4EM8
1738-OB4EM8
1738-OB4EM8


对于公司而言，断电则意味着巨大的财务损失。更长时间的断电会导致航班取消，由此造成的损失是非常巨大的;每取消一趟航班，损失的收益可能高达 20万美元。而且，公司并不是断电的受害者。机场每天损失的收益可达250,000.美元，其中特许商店的损失为100,000.美元。
　　毫无疑问，长时间的断电会严重影响机场、承租方及公司的收益，更不用提因公众出行受阻而导致的紧张公共关系。
　　因此，决定扩展机场及其配套设施时，引入电力管理控制系统(PMCS)。
　　面临的挑战
　　机场的电力控制与测系统由多个小型分散系统组成。这样一来，不仅难以对系统实施控，报告和报通知也远远不足。原始系统配备的电力测器不准确，且通信功能有限。
　　机场希望使用单一系统来提供测和管理电气系统所需的全部信息。当务之急是测量能耗。同时们也为新系统设立了其它目标：
　　● 该系统功能完备、可靠、用户友好且可扩展
　　● 需要降低运营成本，能够更有效地管理能源并将能源成本公平地分摊给承租方
　　● 能够分辨和记录异常事件并发出报
　　● 在未来预期增长中可进行扩展
　　● 允许机场工作人员在没有协助或只需少量协助的情况下轻松添加硬件或修改软件
　　有一点要求应予以重视且非常必要：系统需要在供电设施出现故障时保持机场机能完备。在总体规划中，机场在部分或完全断电期间不能以降低的应急水平运行。发生异常或灾难件时，机场仍需以正常水平全功能运行。
RSView32提供系统的图形视图，电气技术人员和通信中心人员可借此掌握配电系统的情况。此外还提供报通知功能。
　　RSTrend用于记录关键参数，例如每个配电盘上的电压与功率因数。Microsoft Access与利用Visual Basic编写的电能记录程序一起，提供报表、成本分配以及负荷分布功能。尽管实时电气参数可以显示在RSView32屏幕上，但们还采用了RSPower，用来组态Power monitor以及查看Power monitor日志、示波器和谐波。
　　PMCS的主要功能是能源分布系统测。设备状态得到测，并以图形方式清楚地显示在主测PC上。断路器、发电机、变压器、负载柜及自动转接开关等设备的状态点也得到测。系统还会实时测电压、电流、功率、功率因数等电气参数。存在异常情况时会发出报。
　　所有这些信息都显示在图形用户界面上，便于快速了解系统中任何元件的状态并“深入”系统检查I/O点、Power monitor以及各个断路器的状态和参数。
　　新型PMCS还可以平衡机场多个发电机之间的负荷。自动负荷卸载与平衡有助于确保发电机以水平运行，同时又能提高其可靠性。
　　取得的成果
　　在真正进入项目之前，罗克韦尔自动化的PEMS小组设计并安装的PMCS系统就已经能满足机场的每一项要求。该系统甚至还可以根据需要依次开关机场内的灯光，控制照明。“测量数据记录器”作为该解决方案的另一部分，负责记录机场上下的能耗，让机场能够合理地向承租方收费。
　　在本文的开始，们介绍了断电范围扩大可能带来的某些潜在损失。从某种意义上讲，PMCS就是一份。据估计，该系统的总安装成本为280万美元。
　　幸运的是，自从安装该系统以来，机场再也没有遇到任何意外断电情况。其中也有一部分原因是因为在安装PMCS之前对配电系统实施过升级。
　　不过，与断电造成的巨额损失相比，PMCS只需累积避免八小时断电时间便可完全抵销自身的安装成本!
　　该系统操作方便，能提高员工的效率，同时有助于更迅速地应对电气系统故障。此外，该系统还提供潜在故障告功能，因此可以规避某些问题，避免造成重大影响。同时能耗效率也更高。后，还为扩展和升级做了完铺垫。
　　下页中的架构描绘了罗克韦尔自动化的信息化企业概念。棕色虚线括起来的区域代表当前在本文档中讨论的自动化层级。其余部分说明了罗克韦尔自动化目前为实现车间与企业乃至更深层次的整合所能提供的解决方案。出于保密目的，该客户希望以匿名形式出现。


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