MM4-1413-5

MM4-1413-5
MM4-1413-5
MM4-1413-5

背景
　　英的供水与污水服务提供商 Thames Water 每天向伦敦和泰晤士河谷区域的 880 万客户供应 26 亿升自来水。
　　该公司拥有 4,500 名员工，运营并维护 100 家自来水厂，30 个生水蓄水池，288 个泵站和 235 个洁净水供水池，而且每年要执行 400,000 次以上的测试，以确保供应的饮用水满足严格的英和欧洲标准。此外，该公司还为覆盖 1400 万客户的区域排出并处理 28 亿升的污水。
　　由于客户群如此庞大，Thames Water 肩负着巨大的责任，并致力于不断维护其管道网络，完善其供水机制。其正在采取的一项积极举措是通过购进新设备和铺设新管道，增强其供水网络的性，从而在供水基础设施中形成冗余机制。
　　例如，在一项耗资 1.1 亿英镑的工程中，Thames Water 部署了罗克韦尔自动化的中压解决方案，用以处理与伦敦环形主管道相连的新竖井的泵送工作。
　　面临的挑战
　　全新的竖井用于将 Hampton 自来水厂的设施连接到现有的 Thames Water 环形主管道(位于伦敦地下长 80km )。竖井深 50m，直径为 18m，这一尺寸反映了安装的规模。
　　Thames Water 的 Hampton 自来水厂面临的主要挑战是空间不足，因为规划所需的解决方案需要采用大型中压基础设施。该公司找到一个可以安装大型水泵和中压设备而不会影响现有运营的解决方案。终，该公司决定重新利用现有的建筑设施，将水泵和中压设备分开安装在两处。
　　此外，还确保现有水泵仍在运行时目前的供水不受影响，这就要求分阶段进行切换，即在不造成任何中断的情况下完成。水泵单元分为高压和低压两种，低压单元切换是要考虑的问题，因为低压单元直接与消费者相连，而且 Thames Water 没有可以提供支持的地面蓄水池。
　　解决方案
　　罗克韦尔自动化全集成解决方案由 10 台 Allen-Bradley® PowerFlex® 7000 中压变频器组成，这些变频器与水泵配合使用，每一台均配备 Allen-Bradley ControlLogix® 可编程自动化控制器 (PAC)。变频器通过 EtherNet/IP 与一台主控制器相连。而主控制器为另一台 Allen-Bradley ControlLogix PAC，连接到自来水厂的 SCADA 解决方案。采用的 Allen-Bradley PanelView™ HMI 可以运行 FactoryTalk View™，能够实现可视化。
　　罗克韦尔自动化提供的所有中压变频器均采用直接驱动技术，因此无需输入变压器，而且其有源前端可降低谐波。此外，该技术采用三进/三出的理念，非常易于用户使用，安装也非常简便。
　　这种安装方式带有革新性，因为中压变频器通常为独立元件，独立于其它系统运行。它还被认为是为英水处理行业打造的的中压安装解决方案之一。此外，这些变频器是罗克韦尔自动化在波兰新设的生产厂所生产的批产品。

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