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常山自来水厂年用电量达百万kwh。为挖掘节电潜力，该厂在找出供水规律的基础上，采用变频调速节电技术，把双机并联运行改为大小水泵单机切换运行，分三个时段实现恒压供水。应用变频调速技术后，每千吨供水电耗由对社＊h降到用俄＊h，节电率达10％。为了使节电取得实效，该厂
The Changshan Water Plant uses a million kwh of electricity each year. In order to tap the potential of saving electricity, the plant used variable frequency speed-regulating power-saving technology on the basis of finding out the law of water supply, changed the parallel operation of the two machines into a single-machine switching operation of the large-sized water pump, and realized constant-pressure water supply in three periods. After the application of variable frequency speed regulation technology, the power consumption per kiloton of water supply was reduced from that of the agency to Russia, and the energy saving rate was 10%. In order to save electricity and achieve practical results, the plant