Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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交流接触器节能技术

2014-1-2 8:35:18      点击:
交流接触器 广泛应用于低压电路中,是一种使用安全、控制方便、量大而面广的工业必需品。我国现在普遍使用的额定电流在63A及以上的大、中容量交流接触器应以上亿台计,其操作电磁系统在吸持时消耗的有功功率在10W~100W之间;消耗的无功功率则在数十乏尔至数百乏尔之间。所耗有功功率的分配大致为:铁芯65%~75%、短路环25%~30%、线圈3%~5%。对于我国这样一个正处于工业化、城市化进程加快的交流接触器使用大国,且能源需求日趋紧张,节约电力资源已成为当务之急。
如对上述交流接触器的操作电磁系统采用相应的节电技术,将其操作电磁系统由原设计的交流吸持改为直流吸持,可以节省铁芯和短路环中绝大部分的损耗功率,从而取得较高的节电效率(一般有功节电率>90%以上)。不仅如此,通过改造还可降低或消除噪音,降低线圈温升并延长接触器的使用寿命。
节电标准

为了适应能源结构调整需要,我国在原有GB 8871-----1998《交流接触器节电及其应用技术条件》基础上,对标准重新进行了修订,并颁布GB 8871---2001《交流接触器节电器》。在新标准中,对噪声及噪声试验、节电率及节电率的测量、电磁兼容EMC及试验条款都列入强制执行条款,这无疑对交流接触器节能技术的研究推广起到积极作用。