1769-RD羅克韋爾
1769-RD /allen-bradley
1769-RD正品AB
背景
英的供水與污水服務提供商 Thames Water 每天向倫敦和泰晤士河谷區域的 880 萬客戶供應 26 億升自來水。
該公司擁有 4,500 名員工，運營並維護 100 家自來水廠，30 個生水蓄水池，288 個泵站和 235 個潔凈水供水池，而且每年要執行 400,000 次以上的測試，以確保供應的飲用水滿足嚴格的英和歐洲標準。此外，該公司還為覆蓋 1400 萬客戶的區域排出並處理 28 億升的污水。
由於客戶群如此龐大，Thames Water 肩負著巨大的責任，並致力於不斷維護其管道網絡，完善其供水機制。其正在採取的一項積極舉措是通過購進新設備和鋪設新管道，增強其供水網絡的性，從而在供水基礎設施中形成冗餘機制。
例如，在一項耗資 1.1 億英鎊的工程中，Thames Water 部署了羅克韋爾自動化的中壓解決方案，用以處理與倫敦環形主管道相連的新豎井的泵送工作。
面臨的挑戰
全新的豎井用於將 Hampton 自來水廠的設施連接到現有的 Thames Water 環形主管道(位於倫敦地下長 80km )。豎井深 50m，直徑為 18m，這一尺寸反映了安裝的規模。
Thames Water 的 Hampton 自來水廠面臨的主要挑戰是空間不足，因為規劃所需的解決方案需要採用大型中壓基礎設施。該公司找到一個可以安裝大型水泵和中壓設備而不會影響現有運營的解決方案。終，該公司決定重新利用現有的建築設施，將水泵和中壓設備分開安裝在兩處。
此外，還確保現有水泵仍在運行時目前的供水不受影響，這就要求分階段進行切換，即在不造成任何中斷的情況下完成。水泵單元分為高壓和低壓兩種，低壓單元切換是要考慮的問題，因為低壓單元直接與消費者相連，而且 Thames Water 沒有可以提供支持的地面蓄水池。
解決方案
羅克韋爾自動化全集成解決方案由 10 臺 Allen-Bradley? PowerFlex? 7000 中壓變頻器組成，這些變頻器與水泵配合使用，每一臺均配備 Allen-Bradley ControlLogix? 可編程自動化控制器 (PAC)。變頻器通過 EtherNet/IP 與一臺主控制器相連。而主控制器為另一臺 Allen-Bradley ControlLogix PAC，連接到自來水廠的 SCADA 解決方案。採用的 Allen-Bradley PanelView? HMI 可以運行 FactoryTalk View?，能夠實現可視化。
羅克韋爾自動化提供的所有中壓變頻器均採用直接驅動技術，因此無需輸入變壓器，而且其有源前端可降低諧波。此外，該技術採用三進/三出的理念，非常易於用戶使用，安裝也非常簡便。
這種安裝方式帶有革新性，因為中壓變頻器通常為獨立元件，獨立於其它係統運行。它還被認為是為英水處理行業打造的的中壓安裝解決方案之一。此外，這些變頻器是羅克韋爾自動化在波蘭新設的生產廠所生產的批產品。
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