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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上海人民電器廠斷路器的工作原理

2021/1/19 14:41:23      點擊:

斷路器的工作原理

    斷路器內部一般由觸頭系統、滅弧系統、操作機構、脫扣器、外殼等構成,其作用是切斷和接通負荷電路,以及切斷故障電路,防止事故擴大,保證安全運行。因此,斷路器的工作原理是這樣的:

斷路器的工作原理圖

    1、當短路時,大電流(一般10至12倍)產生的磁場克服反力彈簧,脫扣器拉動操作機構動作,開關瞬時跳閘。

    2、當過載時,電流變大,發熱量加劇,雙金屬片變形到一定程度推動機構動作,從而使得開關跳閘;電流越大,動作時間越短。

    3、有電子型的,使用互感器采集各相電流大小,與設定值比較,當電流異常時微處理器發出信號,使電子脫扣器帶動操作機構動作。

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