3HAC0055-3
3HAC0055-3
3HAC0055-3
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〖厦门光沃自动化设备有限公司 竭诚为您服务〗
〖联系人:欧先生 〗
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【价格】如此低价,仅此一家
【货期】大量现货,下单后即可发货
【质量】全新原装,进口***
【保障】产品经过专业检测,质保一年,15天包退换
【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件
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对送水泵房中的2#泵与4#泵实施变频节能改造,在已建成的送水泵房内对两组630kW/10kV电机机组添加变频调速系统的改造,将原设计的转子串级调速拆除改为高压变频器变频调速。采用变频器一拖二手动切换方式:(1)高压供电回路使用旧电路。(2)采取恒压变流形式来调节技改送水泵的转速,将压力维持在0.5MPa;(3)在MCC室并列安置原低压供电设备及变频柜。(4)增设10kV电力电缆,并更换Y560-8型电机1台。(5)通过硬接线来实现与PLC控制系统的数据交换,可是必须将通讯接口保留下来,选用Profib-us-DP作为通讯协议。(6)调速范围控制在20-50Hz。
对于一台水泵来说,其水压、流量和所需功率均会因叶轮转速的改变而发生改变,它们之间的关系如下:
从上述关系可总结出如下结论:Q(水量)∝n(转速);P(水压)∝n(转速);N(水泵轴功率)∝n(转速),也就是说当转速发生改变时,水压、水量以及功率的变动速度也是各不相同的,而且功率的改变速率最大。当转速降至70%时,水量也会随之降至70%,可水压会下降至49%、功率会下降至34.3%。可见,通过对水泵转速进行调节,便可改变水压和水量,无需对阀门进行调节来改变管道的阻力特点,这样可以有效的减少节流损失,从而实现节能的效果。
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