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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    DCL直流平波電抗器中國人民電器概述

    2020/5/23 10:34:55點擊:
    產品簡述
             濾波電抗器,又稱直流平波電抗器,用于變流器的直流側,電抗器中流過的是具有交流分量的直流電流。它的作用是將疊加在直流電流上的交流分量限制在某一規定值內。還用于并聯變頻器的直流側對耦,降低斷續極限,限制環流線路中的環流,應用于直流快速開關切斷故障電流時限制電流上升率,還被用在電流、電壓型變頻器中間回路的直流平波,這可用于整流電源平波,以消除紋波。
             平波電抗器用于整流以后的直流回路中。整流電路的脈波數總是有限的,在輸出的整直電壓中總是有紋波的。這種紋波往往是有害的,需要由平波電抗器加以抑制。直流輸電的換流站都裝有平波電抗器,使輸出的直流接近于理想直流。直流供電的晶閘管電氣傳動中,平波電抗器也是不可少的。
            平波電抗器與直流濾波器一起構成高壓直流換流站直流側的直流諧波濾波回路。平波電抗器一般串接在每個極換流器的直流輸出端與直流線路之間,是高壓直流換流站的重要設備之一。   平波電抗器和直流濾波器一起構成直流T型諧波濾波網,減小交流脈動分量并濾除部分諧波,減少直流線路沿線對通信的干擾和避免諧波使調節不穩定。 平波電抗器還能防止由直流線路產生的陡波沖擊進入閥廳,使換流閥免遭過電壓的損壞。  
         當逆變器發生某些故障時,可避免引起繼發的換相失敗。可減小因交流電壓下降引起逆變器換相失敗的機率。當直流線路短路時,在整流側調節配合下,限制短路電流的峰值。 電感值并不是越大越好,因為電感的增大對直流輸電系統的自動調節特性有影響。   
           在直流輸電系統中,當直流電流發生間斷時,會產生較高過電壓,對絕緣不利,使控制不穩定。 平波電抗器通過限制由快速電壓變化所引起的電流變化率來防止直流電流的間斷,從而降低換流器的換相失敗率.
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