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自耦變壓器怎么接線,自耦變壓器的接線原理圖

發表時間:2021-04-27 17:00【 閱讀量:-查看手機網址
掃一掃!自耦變壓器怎么接線,自耦變壓器的接線原理圖掃一掃!

  問:電機的自耦變壓器怎么接線?


  答:1.電機自耦降壓啟動原理及接線圖電機自耦降壓啟動接線圖,適用于任何接法的三相異步電動機,可以按允許的啟動電流和所需的啟動轉矩來選擇自耦變壓器的不同抽頭實現降壓啟動,而且不論電動機的定子繞組采用Y或Δ接法都可以使用,自耦變壓器的功率應予電動機的功率一致,如果小于電動機的功率,自耦變壓器會因起動電流大發熱損壞絕緣燒毀繞組。但電機自耦變壓器降壓啟動所需設備體積大,投資較貴。


  2.電機自耦降壓啟動接線圖如下:

自耦變壓器怎么接線

  如上述電機自耦降壓啟動接線圖對照原理圖核對接線,要逐相的檢查核對線號。防止接錯線和漏接線。


  電機自耦降壓的啟動原理:電機啟動時利用自耦變壓器來降低加在電動機定子繞組上的啟動電壓。待電動機啟動后,再使電動機與自耦變壓器脫離,從而在全壓下正常運動,從而實現電機的降壓啟動。


  自耦變壓器一般由兩組抽頭可以得到不同的輸出電壓(一般為電源電壓的80%和65%),啟動時使自耦變壓器中的一組抽頭一般用65%抽頭,接在電動機的回路中,當電動機的轉速接近額定轉速時,將自耦變壓器切除,使電動機直接接在三相電源上進入全壓運轉狀態。


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