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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      真空斷路器的真空下降以及漏氣的原因

      2013/11/22 10:17:19      點擊:
      一、分合閘速度的影響
           斷路器的分合閘速度對真空斷路器的滅弧起到了一定的作用,也決定著真空斷路器的使用壽命。所以斷路器在投運前均應測量分合閘速度,可以及時發現產品質量和調試上的一些問題。一方面防止分合閘速度過大,斷路器觸頭動作終了時機械撞激烈,使滅弧室產生更為嚴重震動。
      二、操作機構容量的影響
          真空斷路器現常見的操作機構主要有CDlO型、CDl7型、VSl型以及在上述型號的基礎上,為適應不同的安裝空間而改造的操作機構,近幾年國內部分斷路器又配用了“永磁式操作機構”。
      配置不同型式的操作機構,在安裝或改造時,均應著重注意操作傳動桿的動作距離,如果容量偏大,將對滅弧室產生嚴重撞擊,造成真空滅弧室波紋管損壞,直接影響真空斷路器的使用壽命,使斷路器真空度降低速度加快。
      三、緩沖器的影響
           應仔細檢查緩沖器行程,不應有變形損傷現象或壓縮超量,須留緩沖裕度。部分充油緩沖器應定時檢查緩沖器油位情況,及時補油。
      四、彈跳的影響
            真空斷路器的觸頭多為平面對接式結構,在分合閘操作中不可避免地產生不同程度的反彈現象。不論分閘反彈還是合閘反彈都會給運行帶來危害:波紋管經受強迫振動可能產生裂紋,使滅弧室漏氣;分合閘時斷路器觸頭運動速度較高,動作終結時沖擊力較大,引發彈跳,可能產生觸頭和導電桿的變形,甚至產生裂紋;切合電容器組的真空斷路器如果發生合閘彈跳,還會導致電容器的損壞。
           因此目前部分真空斷路器廠家已注意到真空斷路器彈跳造成的危害,推出了所謂的“無彈跳”真空斷路器,通過機械緩沖等手段,大大減少了斷路器在分合閘時產生的機械沖擊。
      五、觸頭行程的影響
           目前國內生產的各種型號的10kv真空斷路器滅弧室,其觸頭超行程按規程規定在4mm左右,開距11mm左右。真空斷路器在安裝或檢修時,應嚴格按照產品安裝說明書中觸頭行程要求準確測量,調整拉桿,防止行程超越,且真空斷路器在每年大檢修中,都應仔細復查斷路器的行程、超行程及觸頭的開距。在實際運行中不乏因斷路器超行程調整不當,造成斷路器合閘過程中機械沖擊引起滅弧室破裂、導電桿變形的事故。
      日本中文字幕不卡无码视频
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