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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    高壓互感器分類

    2014/1/10 9:08:14      點(diǎn)擊:
     高壓互感器 ——按原理分為電磁感應(yīng)式和電容分壓式兩類。
    按用途,電壓互感器又分為測量用和保護(hù)用兩類。
    電磁感應(yīng)式電壓互感器。工作原理與變壓器相同;窘Y(jié)構(gòu)也是鐵芯和原、副繞組。特點(diǎn)是容量很小且比較恒定,正常運(yùn)行時接近于空載狀態(tài)。電壓互感器本身阻抗很小,一旦副邊發(fā)生短路,電流將急劇增加而燒毀線圈。為此,電壓互感器原邊接有熔斷器,副邊接地,以免原、副邊絕緣損壞時,副邊出現(xiàn)對地高電位而造成事故。電磁感應(yīng)式電壓互感器的等值電路與變壓器的等值電路相同。
    電容分壓式電壓互感器。在電容分壓器的基礎(chǔ)上制成。電容式電壓互感器多與電力系統(tǒng)載波通信的耦合電容器合用,以簡化系統(tǒng),降低造價。此時,它還需滿足通信運(yùn)行上的要求。電壓互感器按結(jié)構(gòu)分類,有充油式、干式以及三芯五柱式和單相式,還有全絕緣式和半絕緣式。
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