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      三相變壓器的工作(zuo)原理主要(yao)是(shi)基(ji)于電(dian)磁感應原理，通過改(gai)變交流電(dian)壓的裝置，主要(yao)構件包括初級線圈、次級線圈和鐵心（磁芯）。

      三相(xiang)(xiang)(xiang)(xiang)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)為了適應(ying)不同的輸(shu)入(ru)電(dian)(dian)壓(ya)(ya)，可(ke)以采用多個繞組(zu)，通過不同的接法（如(ru)星形(xing)、三角形(xing)）使其(qi)輸(shu)入(ru)三相(xiang)(xiang)(xiang)(xiang)交流電(dian)(dian)源，其(qi)輸(shu)出亦如(ru)此。這(zhe)種(zhong)設計使得三相(xiang)(xiang)(xiang)(xiang)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)能夠改變(bian)(bian)(bian)三相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)壓(ya)(ya)，類似于單相(xiang)(xiang)(xiang)(xiang)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)改變(bian)(bian)(bian)單相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)壓(ya)(ya)的方式(shi)。三相(xiang)(xiang)(xiang)(xiang)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)的磁路系統(tong)按(an)其(qi)鐵芯(xin)(xin)結構(gou)可(ke)分為組(zu)式(shi)磁路和芯(xin)(xin)式(shi)磁路。組(zu)式(shi)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)由三臺單相(xiang)(xiang)(xiang)(xiang)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)組(zu)成，而芯(xin)(xin)式(shi)變(bian)(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)每相(xiang)(xiang)(xiang)(xiang)有一個鐵芯(xin)(xin)柱，三個鐵芯(xin)(xin)柱用鐵軛(e)連接起(qi)來(lai)，構(gou)成三相(xiang)(xiang)(xiang)(xiang)鐵芯(xin)(xin)。

     三(san)相(xiang)(xiang)變壓器的繞(rao)組(zu)(zu)連(lian)(lian)接(jie)(jie)(jie)可以采用(yong)星(xing)形連(lian)(lian)接(jie)(jie)(jie)或三(san)角(jiao)形連(lian)(lian)接(jie)(jie)(jie)，這兩(liang)種連(lian)(lian)接(jie)(jie)(jie)方式在(zai)我國主要采用(yong)。星(xing)形連(lian)(lian)接(jie)(jie)(jie)將(jiang)三(san)相(xiang)(xiang)繞(rao)組(zu)(zu)的三(san)個末(mo)端聯結(jie)在(zai)一起(qi)，而把它們的首(shou)端引(yin)出；三(san)角(jiao)形連(lian)(lian)接(jie)(jie)(jie)則將(jiang)一相(xiang)(xiang)繞(rao)組(zu)(zu)的末(mo)端和另一相(xiang)(xiang)繞(rao)組(zu)(zu)的首(shou)端連(lian)(lian)在(zai)一起(qi)，順次連(lian)(lian)接(jie)(jie)(jie)成一閉合(he)回路，然(ran)后(hou)從(cong)首(shou)端引(yin)出。

     三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)器(qi)(qi)的(de)應用廣(guang)泛，不僅在(zai)(zai)工業變壓(ya)(ya)(ya)器(qi)(qi)領域，還(huan)在(zai)(zai)電力工業中(zhong)(zhong)的(de)輸配電系統(tong)中(zhong)(zhong)采用三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)制。變換三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)交流電電壓(ya)(ya)(ya)時(shi)，使(shi)用三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)隔(ge)離變壓(ya)(ya)(ya)器(qi)(qi)。這(zhe)種變壓(ya)(ya)(ya)器(qi)(qi)可(ke)以由三(san)(san)個單(dan)相(xiang)(xiang)(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)器(qi)(qi)拼合(he)在(zai)(zai)一(yi)起組(zu)成(cheng)(cheng)，各相(xiang)(xiang)(xiang)(xiang)(xiang)磁(ci)通都(dou)經過中(zhong)(zhong)間(jian)鐵心(xin)，由于三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)磁(ci)通對(dui)稱，通過中(zhong)(zhong)間(jian)鐵心(xin)的(de)總(zong)磁(ci)通為零，故中(zhong)(zhong)間(jian)鐵心(xin)柱可(ke)以取消，使(shi)得三(san)(san)相(xiang)(xiang)(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)器(qi)(qi)比三(san)(san)個單(dan)相(xiang)(xiang)(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)器(qi)(qi)組(zu)合(he)效率高、成(cheng)(cheng)本低、體積小(xiao)。

      綜上(shang)所(suo)述，三相變壓(ya)器通(tong)(tong)過其特(te)定的(de)設計和(he)工(gong)作原理(li)，在電力系(xi)統中(zhong)扮演著重(zhong)要的(de)角色，不(bu)僅能夠有效變換交(jiao)流電壓(ya)、電流和(he)阻抗，還通(tong)(tong)過其高效、經濟(ji)的(de)特(te)性，廣泛應(ying)用(yong)于(yu)各種(zhong)電源(yuan)及電氣設備中(zhong)。