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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      漏電斷路器的選擇上海人民電器廠概述

      2020/11/30 14:56:43      點擊:

       漏電斷路器的選擇

        漏電斷路器一般分為二極、三極、四極,分別應用于不同的線路中。只有正確的選擇與使用才能起到應有的作用,所以選擇漏電斷路器時要注意以下五點:

        1)過載脫扣器的額定電流≥線路的* 大負載電流;2)斷路器的極限通斷能力≥電路* 大短路電流;3)線路應保護的漏電電流應≤斷路器的規定漏電保護電流;4)線路設備的正常工作電壓和電流≤斷路器的額定電壓、電流;5)有較短的分斷反應時間,能夠起到保護線路和設備的作用。

        有時在應用中對于是否選用四極斷路器很難做出判斷,在此提出對于是否選擇四極斷路器需遵循的原則,在下列情況下應選擇四極斷路器:

        1)根據IEC465.1.5條規定,正常供電電源與備用發電機之間的轉換斷路器;2)帶漏電保護的雙電源轉換斷路器應采用四極斷路器。兩個上級斷路器帶漏電保護,其下級的電源轉換斷路器;3)在兩種不同接地系統間電源切換斷路器;4)TT系統的電源進線斷路器;5)IT系統中當有中性線引出時采用的斷路器。

        在下列情況下一般不需要使用四極斷路器或禁止使用四極斷路器:

        1)TN-S、TN-C-S系統一般不需要設置四極斷路器;2)TN-C系統嚴禁使用四極斷路器。

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