描述
实际分析:S即表示视在功率,即电压与电流的乘积,电压相同时,视在功率节约百分比与电流节约百分比是一回事。在有电抗的电路中,视在功率只是反映了配电系统的允许最大输出能力,而不能反映电动机实际消耗的功率。电动机实际消耗的功率只能用有功功率表示。在该例中,虽用实际电流计算,但计算的是视在功率,而不是有功功率。我们知道,电动机实际消耗的功率是由风机及其负载决定的。功率因数的提高并没有改变风机的负载,也没有提高风机的效率,风机实际消耗的功率没有减少。功率因数提高后,电动机运行状态也没有改变,电动机定子电流并没有减少,电动机消耗的有功功率和无功功率都没有改变。功率因数提高的原因是变频器内部滤波电容产生无功功率供给了电动机消耗。随着功率因数提高,变频器的实际输入电流减少,从而减少了电网至变频器之间的线损和变压器的铜耗。同时,负荷电流减小,给变频器供电的变压器、开关、接触器、导线等配电设备可以带更多的负载。需要指出的是,如果象该例一样不考虑线损和变压器铜耗的节约,而考虑变频器的损耗,变频器在50Hz满载运行时,不仅没有节能,而且还费电。因此,用视在功率计算节能效果是不对的
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⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
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◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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