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
亚洲色欲色欲WWW在线看小说,国产69精品久久久久9999不,亚洲色欲色欲77777小说
<p id="9bd71"><del id="9bd71"></del></p>
<big id="9bd71"><b id="9bd71"></b></big>

    <pre id="9bd71"></pre>

    <pre id="9bd71"></pre>
      <pre id="9bd71"><del id="9bd71"></del></pre>
      <ruby id="9bd71"></ruby><pre id="9bd71"><ruby id="9bd71"><mark id="9bd71"></mark></ruby></pre>

          <p id="9bd71"><del id="9bd71"><progress id="9bd71"></progress></del></p>
            你的位置:首頁 > 新聞動態 > 公司新聞

            如何選擇SSR的型號規格

            2019/8/21 8:35:29      點擊:
            主要是選取適當的額定電流的固態繼電器(SSR)除特別說明以外,整流、可控等功率模塊亦然。
            根據不同的負載類型來選用SSR的額定電流。阻性負載、感性負載和容性負載在剛起動時瞬時電流較大。即使是純阻性,由于具有正溫度系數,冷態時電阻值較小,因而有較大的起動電流。電爐剛接通時電流為穩定時的1.3—1.4倍。白熾燈接通時電流為穩態10倍。有些金屬鹵化物燈不但開啟時間長達10分鐘,而且有高達100倍穩態時的脈沖電流。
            異步電動機起動電流為額定值的5—7倍,直流電機起動電流還要大。不但如此,感性負載還具有較高的反電勢。這是一個不定值,隨L和di/dt的不同而不同。通常為電源電壓的1—2倍,這樣和電源電壓疊加。有高達三倍的電源電壓。
            容性負載具有更大的危險性,因為起動時,由于電容器兩端的電壓不能突變,電容器(負載)相當于短路。這種負載在選型時更要特別注意。
            需要特別指出的是用戶不要將SSR的浪涌電流值作為選擇負載起動電流的依據。SSR的浪涌電流值是以晶閘管浪涌電流為標準的。它的前提條件是半個(或一個)電源周波。即10或20ms。而前述啟動過程,少則幾百毫秒、幾分鐘,多則高達10分鐘。這點務必敬請高度注意。