干(gan)式變壓(ya)(ya)(ya)器(qi)(qi)就是指鐵(tie)芯和繞組不浸(jin)漬在絕緣油中的(de)變壓(ya)(ya)(ya)器(qi)(qi)，冷(leng)(leng)卻方式分為自然空氣冷(leng)(leng)卻(AN)和強迫空氣冷(leng)(leng)卻(AF)。自然空冷(leng)(leng)時(shi)(shi)，變壓(ya)(ya)(ya)器(qi)(qi)可(ke)在額定(ding)容量(liang)(liang)下長期連(lian)(lian)續運(yun)行(xing)。強迫風冷(leng)(leng)時(shi)(shi)，變壓(ya)(ya)(ya)器(qi)(qi)輸出容量(liang)(liang)可(ke)提高50%。適(shi)用(yong)(yong)(yong)于(yu)斷續過負(fu)荷(he)(he)運(yun)行(xing)，或應急(ji)事(shi)故過負(fu)荷(he)(he)運(yun)行(xing);由于(yu)過負(fu)荷(he)(he)時(shi)(shi)負(fu)載損耗(hao)和阻抗電壓(ya)(ya)(ya)增幅較大，處于(yu)非經濟運(yun)行(xing)狀態，故不應使(shi)(shi)其處于(yu)長時(shi)(shi)間連(lian)(lian)續過負(fu)荷(he)(he)運(yun)行(xing)。干(gan)式變壓(ya)(ya)(ya)器(qi)(qi)為工礦企業(ye)與民用(yong)(yong)(yong)建筑(zhu)供(gong)配電系統中的(de)重(zhong)要(yao)設備之一(yi)，它將10⑹kV或35kV網絡電壓(ya)(ya)(ya)降至用(yong)(yong)(yong)戶使(shi)(shi)用(yong)(yong)(yong)的(de)230/400V 母線電壓(ya)(ya)(ya)。此類(lei)產品適(shi)用(yong)(yong)(yong)于(yu)交流50(60)Hz，三相(xiang)最(zui)(zui)大額定(ding)容量(liang)(liang)2500kVA(單相(xiang)最(zui)(zui)大額定(ding)容量(liang)(liang)833kVA，一(yi)般不推薦使(shi)(shi)用(yong)(yong)(yong)單相(xiang)變壓(ya)(ya)(ya)器(qi)(qi))