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
<th id="dd0kx"></th>
<rp id="dd0kx"><acronym id="dd0kx"><blockquote id="dd0kx"></blockquote></acronym></rp>
<em id="dd0kx"></em><em id="dd0kx"><tr id="dd0kx"></tr></em>

<button id="dd0kx"><acronym id="dd0kx"></acronym></button>

    1. <tbody id="dd0kx"></tbody>
      <span id="dd0kx"></span>

      <em id="dd0kx"><tr id="dd0kx"></tr></em>
      你的位置:首頁 > 新聞動態 > 技術動態

      不同環境使用不同型號的真空斷路器

      2013/11/16 14:20:34      點擊:

      我們根據斷路器的特點來使用不同環境選用的斷路器的型號,具體內容如下:   

      一、滅弧原理及基本結構
        真空斷路器的滅弧原理是在真空泡內觸頭拉開時,產生電弧,電弧內攜帶了蒸發的金屬氣體,這些氣體是從觸頭表面產生的,最后還會冷卻在觸頭表面和封閉罩的內表面。當電流過零點時,原始的真空狀態迅速恢復,間隙處的介電強度迅速增加,電路被切斷。
        由于采用真空作為滅弧介質,斷路器的結構比較簡單,整體部件少。

      二、可靠性及使用壽命
        真空斷路器的真空泡在正常情況下,在整個壽命期內都是密封的,所以可以保證很高的真空度,在斷路器操作過后,真空度也不會降低,這就保證了額定電流和額定開斷電流值不會降低,有效地提高了斷路器的可靠性。
        在產生電弧時,由于會產生金屬氣體,斷路器的觸頭會有一些磨損,但是這種磨損程度很小,完全在可控范圍內,在要求的機械操作10000次壽命期內是徹底免維護的。因此,可以說真空斷路器正常的使用壽命可以達到幾百年,超過ANSI,IEC標準要求的使用壽命。

        三、對環境的影響
        真空斷路器產生的是少量的純金屬氣體,Cu,Cr氣體,而且基本被觸頭重新捕捉,即使在最惡劣的情況下,即真空泡破裂,釋放出的氣體對環境的影響也小得可以忽略不計。
        良好的滅弧介質和觸頭材料使得真空斷路器能滿足IEEE要求的暫態恢復電壓速率。
       

            四、總結:對真空斷路器的技術特點進行總結,并對其用作發電機出口斷路器的情況進行分析,認為其具有高可靠性、免維護、長壽命、經濟性好等優點,技術上能夠滿足作為發電機出口斷路器的要求,值得推廣用作發電機出口斷路器。

        技術和材料的改進使真空斷路器用作發電機出口斷路器的主要障礙逐步被消除,而同時使它的結構簡單、可靠性高、維護量小及壽命長等優點日益顯現出來。

      日本中文字幕不卡无码视频
      <th id="dd0kx"></th>
      <rp id="dd0kx"><acronym id="dd0kx"><blockquote id="dd0kx"></blockquote></acronym></rp>
      <em id="dd0kx"></em><em id="dd0kx"><tr id="dd0kx"></tr></em>

      <button id="dd0kx"><acronym id="dd0kx"></acronym></button>

        1. <tbody id="dd0kx"></tbody>
          <span id="dd0kx"></span>

          <em id="dd0kx"><tr id="dd0kx"></tr></em>