IC695ACC002
IC695ACC002
IC695ACC002
IC695ACC002
_________________________________________ 〖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 〗 〖手机:18030229053(微信同号) 〗 〖QQ: 2479261344 〗 〖传真:0592-5709825 【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 ______________________________________________
自备电厂有大量风机和水泵,系统处于低负荷运行时,通过关小挡板或阀门来调整风量及流量。此时,电动机输出功率大量的能源消耗在挡板上,节流损失很大。异步电动机在直接启动时,启动电流一般达到电动机额定电流的5-7倍,启动电流过大将造成电网电压波动,影响其他电气设备的正常运行,而高压变频器调速装置可以实现电机的软启动,通过调整频率来改变电机转速,满足不同负载的工艺要求,节能效果显著。 1、引言 包头希望铝业热电厂总装机容量1320MW,电厂一期4*155MW机组、二期2*350MW机组已全部并网发电。电厂现有2台155MW凝汽式发电机机组运行,随着电网内大机组的相继投产,该厂的调峰任务越来越重,峰谷差日益增大,根据现场运行资料统计,155MW机组每日的负荷一般在73.6MW左右。系统处于低负荷运行时,系统相关设备也要随着负荷的变化作相应的调整,必须通过关小挡板或阀门来调整风量及流量。此时,电动机输出功率大量的能源消耗在挡板上,节流损失很大。异步电动机在直接启动时,启动电流一般达到电动机额定电流的5-7倍,启动电流过大将造成电网电压波动,影响其他电气设备的正常运行,同时电动机自身绕组严重发热,加速绝缘老化,缩短使用寿命。而高压变频器调速装置可以实现电机的软启动,通过调整频率来改变电机转速,满足不同负载的工艺要求,是解决以上矛盾的有效手段。 2、高压变频器调速节能原理 2.1 高压变频器工作原理 高压变频器是利用电力半导体器件的通断作用将工频电源变换为另一频率的电能控制装置。它是按一定规律改变脉冲列的脉冲宽度或幅度,以调节输出量和波形的,从而实现电动机电压和频率的平滑变化。
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