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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      1. 斷路器故障處理

        2013/12/16 8:22:27      點擊:

        拒合”故障的判斷和處理
        發(fā)生“拒合”情況,基本上是在合閘操作和重合閘過程中。此種故障危害性較大,

        例如在事故情況下要求緊急投入備用電源時,如果備用電源斷路器拒絕合閘,則會擴大事故。判斷斷路器“拒合”的原因及處理方法一般可以分三步。
        1)檢查前一次拒絕合閘是否因操作不當引起(如控制開關放手太快等),用控制開關再重新合一次。
        2)若合閘仍不成功,檢查電氣回路各部位情況,以確定電氣回路是否有故障。檢查項目是:合閘控制電源是否正常;合閘控制回路熔斷器和合閘回路熔斷器是否良好;合閘接觸器的觸點是否正常;將控制開關扳至“合閘時”位置,看合閘鐵芯動作是否正常。
        3)如果電氣回路正常,斷路器仍不能合閘,則說明為機械方面故障,應停用斷路器,報告調(diào)度安排檢修處理。
        經(jīng)過以上初步檢查,可判定是電氣方面,還是機械方面的故障。常見的電氣回路故障和機械方面的故障分別敘述如下。
        1、電氣方面常見的故障
        若合閘操作前紅、綠燈均不亮,說明無控制電源或控制回路有斷線現(xiàn)象?蓹z查控制電源和整個控制回路上的元件是否正常,如:操作電壓是否正常,熔斷器是否熔斷,防跳繼電器是否正常,斷路器輔助接點接觸是否良好等。
        當操作合閘后綠燈閃光,而紅燈不亮,儀表無指示,喇叭響,斷路器機械分、合閘位置指示器仍在分閘位置,則說明操作手柄位置和斷路器的位置不對應,斷路器未合上。其常見的原因有:合閘回路熔斷器熔斷或接觸不良;合閘接觸器未動作;合閘線圈發(fā)生故障。
        當操作斷路器合閘后,綠燈熄滅,紅燈瞬時明亮后又熄滅,綠燈又閃光且有喇叭響,說明斷路器合上后又自動跳閘。其原因可能是斷路器合在故障線路上造成保護動作跳閘或斷路器機械故障不能使斷路器保持在合閘狀態(tài)。
        若操作合閘后綠燈閃光或熄滅,紅燈不亮,但表計有指示,機械分、合閘位置指示器在合閘位置,說明斷路器已經(jīng)合上。可能的原因是斷路器輔助接點接觸不良,例如常閉接點未斷開,常開接點未合上,致使綠燈閃光和紅燈不亮;還可能是合閘回路斷線或合閘紅燈燒壞。
        操作手把返回過早。

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