山東聊城變壓器有限公司生產的三相變壓器巡視檢查，三相變壓器運行巡視檢查內容和周期如下:
1、檢查儲油柜和充油絕緣套管內油面的高度和封閉處有無滲漏油現象，以及油標管內的油色。
2、檢查三相變壓器上層油溫。正常時一般應在850C以下，輸電線路將幾萬伏或幾十萬伏的高壓電能輸送到負荷區后，須經降壓三相變壓器將高電壓降低，以適合于用電設備的使用。故在供電系統中需要大量的降壓三相變壓器，將輸電線路輸送的高壓變換成不同等級的電壓，以滿足各類負荷的需要。干式變壓器一(yi)、二(er)(er)次(ci)(ci)(ci)側繞組(zu)因匝(za)數(shu)(shu)不(bu)同將導(dao)致一(yi)、二(er)(er)次(ci)(ci)(ci)側繞組(zu)的(de)(de)(de)電(dian)(dian)壓(ya)(ya)(ya)高(gao)(gao)低不(bu)等，匝(za)數(shu)(shu)多的(de)(de)(de)一(yi)邊電(dian)(dian)壓(ya)(ya)(ya)高(gao)(gao)，匝(za)數(shu)(shu)少的(de)(de)(de)一(yi)邊電(dian)(dian)壓(ya)(ya)(ya)低，這(zhe)就(jiu)(jiu)是三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)能夠改(gai)變(bian)(bian)電(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)道(dao)理。如果忽(hu)略三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)的(de)(de)(de)內損耗，可認為(wei)三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)二(er)(er)次(ci)(ci)(ci)輸出功(gong)率(lv)等于三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)一(yi)次(ci)(ci)(ci)輸入(ru)功(gong)率(lv)，即: U1I1=U2I2，式中I1、I2分(fen)別為(wei)三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)一(yi)次(ci)(ci)(ci)、二(er)(er)次(ci)(ci)(ci)電(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)有(you)效(xiao)值。由此(ci)可見，三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)一(yi)、二(er)(er)次(ci)(ci)(ci)電(dian)(dian)流(liu)(liu)(liu)之比與一(yi)、二(er)(er)次(ci)(ci)(ci)繞組(zu)的(de)(de)(de)匝(za)數(shu)(shu)比成反(fan)比。即三(san)相(xiang)(xiang)(xiang)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)匝(za)數(shu)(shu)多的(de)(de)(de)一(yi)側電(dian)(dian)流(liu)(liu)(liu)小，匝(za)數(shu)(shu)少的(de)(de)(de)一(yi)側電(dian)(dian)流(liu)(liu)(liu)大，也就(jiu)(jiu)是電(dian)(dian)壓(ya)(ya)(ya)高(gao)(gao)的(de)(de)(de)一(yi)側電(dian)(dian)流(liu)(liu)(liu)小，電(dian)(dian)壓(ya)(ya)(ya)低的(de)(de)(de)一(yi)側電(dian)(dian)流(liu)(liu)(liu)大。

例如:SFZ-10000/110表(biao)示三(san)(san)相(xiang)自然循環風冷有載(zai)調壓(ya)(ya)(ya)，額定(ding)容(rong)量(liang)為10000kVA，高壓(ya)(ya)(ya)繞(rao)組(zu)(zu)額定(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)1lOkV電(dian)(dian)(dian)(dian)力三(san)(san)相(xiang)變(bian)壓(ya)(ya)(ya)器(qi)。S9-160/10表(biao)示三(san)(san)相(xiang)油浸(jin)自憐式(shi)(shi)，雙繞(rao)組(zu)(zu)無(wu)(wu)勵磁調壓(ya)(ya)(ya)，額定(ding)容(rong)量(liang)l60kVA，高壓(ya)(ya)(ya)側繞(rao)組(zu)(zu)額定(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)為lOkV電(dian)(dian)(dian)(dian)力三(san)(san)相(xiang)變(bian)壓(ya)(ya)(ya)器(qi)。SC8-315/10表(biao)示三(san)(san)相(xiang)干式(shi)(shi)澆注(zhu)絕緣(yuan)，雙繞(rao)組(zu)(zu)無(wu)(wu)勵磁調壓(ya)(ya)(ya)，額定(ding)容(rong)量(liang)315kVA，高壓(ya)(ya)(ya)側繞(rao)組(zu)(zu)額定(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)為lOkV電(dian)(dian)(dian)(dian)力三(san)(san)相(xiang)變(bian)壓(ya)(ya)(ya)器(qi)。S11-M(R)-100/10表(biao)示三(san)(san)相(xiang)油浸(jin)自冷式(shi)(shi)，雙繞(rao)組(zu)(zu)無(wu)(wu)勵磁調壓(ya)(ya)(ya)，卷(juan)繞(rao)式(shi)(shi)鐵芯 (圓(yuan)截面)，密(mi)封(feng)式(shi)(shi)，額定(ding)容(rong)量(liang)l00kVA，高壓(ya)(ya)(ya)側繞(rao)組(zu)(zu)額定(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)為lOkV電(dian)(dian)(dian)(dian)力三(san)(san)相(xiang)變(bian)壓(ya)(ya)(ya)器(qi)。

SH15-M-50/10表示(shi)(shi)三(san)(san)相(xiang)(xiang)(xiang)油浸自(zi)冷式(shi)(shi)，雙繞(rao)(rao)組(zu)無勵磁調(diao)壓(ya)(ya)(ya)(ya)(ya)，非晶態合金鐵(tie)芯，密(mi)封式(shi)(shi)，額定容(rong)量5OkVA，高(gao)(gao)壓(ya)(ya)(ya)(ya)(ya)側繞(rao)(rao)組(zu)額定電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)為lOkVA的(de)(de)電(dian)(dian)力三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)。電(dian)(dian)力三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)可(ke)以(yi)按(an)繞(rao)(rao)組(zu)藕合方式(shi)(shi)、相(xiang)(xiang)(xiang)數、冷卻方式(shi)(shi)、繞(rao)(rao)組(zu)數、繞(rao)(rao)組(zu)導線材(cai)質和調(diao)壓(ya)(ya)(ya)(ya)(ya)方式(shi)(shi)分(fen)類(lei)。但(dan)是，這種分(fen)類(lei)還(huan)不足以(yi)表達三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)的(de)(de)全部特(te)(te)(te)征，所(suo)以(yi)在(zai)三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)型(xing)號中除(chu)要把分(fen)類(lei)特(te)(te)(te)征表達出來外，還(huan)需標記其額定容(rong)量和高(gao)(gao)壓(ya)(ya)(ya)(ya)(ya)繞(rao)(rao)組(zu)額定電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)等級。圖2一(yi)5是電(dian)(dian)力三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)型(xing)號的(de)(de)表示(shi)(shi)方式(shi)(shi)。一(yi)些新型(xing)的(de)(de)特(te)(te)(te)殊(shu)結構的(de)(de)配電(dian)(dian)三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)，如非晶態合金鐵(tie)芯、卷(juan)繞(rao)(rao)式(shi)(shi)鐵(tie)芯和密(mi)封式(shi)(shi)三(san)(san)相(xiang)(xiang)(xiang)變壓(ya)(ya)(ya)(ya)(ya)器(qi)，在(zai)型(xing)號中分(fen)別加以(yi)H、R和M表示(shi)(shi)。

三(san)相(xiang)變(bian)壓(ya)器(qi)(qi)分單相(xiang)和三(san)相(xiang)兩種，一般均制成三(san)相(xiang)三(san)相(xiang)變(bian)壓(ya)器(qi)(qi)以(yi)直接滿足(zu)輸(shu)配電(dian)的要求。小型(xing)(xing)三(san)相(xiang)變(bian)壓(ya)器(qi)(qi)有制成單相(xiang)的，特(te)大(da)型(xing)(xing)三(san)相(xiang)變(bian)壓(ya)器(qi)(qi)做成單相(xiang)后，組(zu)成三(san)相(xiang)三(san)相(xiang)變(bian)壓(ya)器(qi)(qi)組(zu)，以(yi)滿足(zu)運(yun)輸(shu)的要求。

三相變(bian)(bian)壓(ya)(ya)器(qi)的(de)(de)額(e)定頻率(lv)即是所設(she)計的(de)(de)運(yun)行頻率(lv)，我國為(wei)5OHz。額(e)定電(dian)壓(ya)(ya)是指三相變(bian)(bian)壓(ya)(ya)器(qi)線電(dian)壓(ya)(ya) (有(you)效值)，它應與所連接的(de)(de)輸變(bian)(bian)電(dian)線路(lu)電(dian)壓(ya)(ya)相符合。我國輸變(bian)(bian)電(dian)線路(lu)的(de)(de)電(dian)壓(ya)(ya)等級 (即線路(lu)終端(duan)電(dian)壓(ya)(ya))為(wei)0.38、(3、6)、10、35、(63)、110、220、330、500(kV)。故(gu)連接于線路(lu)終端(duan)的(de)(de)三相變(bian)(bian)壓(ya)(ya)器(qi) (稱(cheng)為(wei)降壓(ya)(ya)三相變(bian)(bian)壓(ya)(ya)器(qi))其一次側額(e)定電(dian)壓(ya)(ya)與上列數值相同。

考慮線路的(de)(de)電(dian)(dian)壓(ya)(ya)降，線路始(shi)(shi)端 (電(dian)(dian)源端)電(dian)(dian)壓(ya)(ya)將高于等(deng)(deng)級電(dian)(dian)壓(ya)(ya)，35kV以(yi)下的(de)(de)要(yao)高5%，35kV及以(yi)上的(de)(de)高10%，即(ji)線路始(shi)(shi)端電(dian)(dian)壓(ya)(ya)為0.4、(3.15、6.3)、10.5、38.5(69)、121、242、363、550(kV)。故連接于線路始(shi)(shi)端的(de)(de)三相(xiang)變壓(ya)(ya)器 (即(ji)升壓(ya)(ya)三相(xiang)變壓(ya)(ya)器)，其二次側額(e)定電(dian)(dian)壓(ya)(ya)與上列數值相(xiang)同(tong)。三相(xiang)變壓(ya)(ya)器產品系(xi)列是(shi)以(yi)高壓(ya)(ya)的(de)(de)電(dian)(dian)壓(ya)(ya)等(deng)(deng)級區(qu)分的(de)(de)，為1OkV及以(yi)下，2OkV、35kV、(66kV)、1lOkV系(xi)列和22OkV系(xi)列等(deng)(deng)。

在三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)銘牌所規定(ding)(ding)的(de)額(e)定(ding)(ding)狀態下，三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)二(er)次側的(de)輸出能力(kVA)。對于三(san)(san)相(xiang)(xiang)(xiang)(xiang)三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)，額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)是(shi)三(san)(san)相(xiang)(xiang)(xiang)(xiang)容(rong)(rong)(rong)量(liang)之和。三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)與(yu)繞(rao)(rao)組(zu)(zu)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)有(you)所區別:雙繞(rao)(rao)組(zu)(zu)三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)的(de)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)即為繞(rao)(rao)組(zu)(zu)的(de)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang);多繞(rao)(rao)組(zu)(zu)三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)應(ying)對每個(ge)繞(rao)(rao)組(zu)(zu)的(de)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)加以(yi)規定(ding)(ding)，其額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)為最(zui)大的(de)繞(rao)(rao)組(zu)(zu)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang);當(dang)三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)容(rong)(rong)(rong)量(liang)由冷卻方式而變(bian)更時，則額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)是(shi)指最(zui)大的(de)容(rong)(rong)(rong)量(liang)。三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)額(e)定(ding)(ding)容(rong)(rong)(rong)量(liang)的(de)大小(xiao)與(yu)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)等級也是(shi)密切相(xiang)(xiang)(xiang)(xiang)關(guan)的(de)。電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)低(di)、容(rong)(rong)(rong)量(liang)大時電(dian)流(liu)大，損(sun)耗增大;電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)高、容(rong)(rong)(rong)量(liang)小(xiao)時絕緣比例過大，三(san)(san)相(xiang)(xiang)(xiang)(xiang)變(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)尺寸相(xiang)(xiang)(xiang)(xiang)對增大。因此，電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)低(di)的(de)容(rong)(rong)(rong)量(liang)必(bi)小(xiao)，電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)高的(de)容(rong)(rong)(rong)量(liang)必(bi)大。

三相(xiang)(xiang)(xiang)變壓器(qi)的(de)(de)額定電(dian)流(liu)為(wei)通過(guo)繞組(zu)(zu)線(xian)端的(de)(de)電(dian)流(liu)，即為(wei)線(xian)電(dian)流(liu) (有(you)效值(zhi))。它(ta)的(de)(de)大小等于(yu)繞組(zu)(zu)的(de)(de)額定容(rong)量除以該(gai)繞組(zu)(zu)的(de)(de)額定電(dian)壓及相(xiang)(xiang)(xiang)應(ying)的(de)(de)相(xiang)(xiang)(xiang)系數 (單相(xiang)(xiang)(xiang)為(wei)l，三相(xiang)(xiang)(xiang)為(wei)3)。 

單相三相變壓器額定電流為: 三相三相變壓器繞組為Y連接時，線電流為繞組電流；D連接時線電流等于1.732繞組電流。
三(san)(san)相(xiang)(xiang)(xiang)變(bian)壓器同(tong)側繞組是按一定形(xing)(xing)(xing)式(shi)連接(jie)(jie)(jie)的(de)。三(san)(san)相(xiang)(xiang)(xiang)三(san)(san)相(xiang)(xiang)(xiang)變(bian)壓器或組成(cheng)(cheng)三(san)(san)相(xiang)(xiang)(xiang)三(san)(san)相(xiang)(xiang)(xiang)變(bian)壓器組的(de)單(dan)相(xiang)(xiang)(xiang)三(san)(san)相(xiang)(xiang)(xiang)變(bian)壓器，則可以連接(jie)(jie)(jie)為星(xing)形(xing)(xing)(xing)、三(san)(san)角(jiao)形(xing)(xing)(xing)等。星(xing)形(xing)(xing)(xing)聯(lian)接(jie)(jie)(jie)是各相(xiang)(xiang)(xiang)線圈的(de)一端(duan)(duan)接(jie)(jie)(jie)成(cheng)(cheng)一個公共點(dian) (中性(xing)點(dian))，其余接(jie)(jie)(jie)端(duan)(duan)子接(jie)(jie)(jie)到相(xiang)(xiang)(xiang)應的(de)線端(duan)(duan)上;三(san)(san)角(jiao)形(xing)(xing)(xing)聯(lian)接(jie)(jie)(jie)是三(san)(san)個相(xiang)(xiang)(xiang)線圈互相(xiang)(xiang)(xiang)串(chuan)聯(lian)形(xing)(xing)(xing)成(cheng)(cheng)閉(bi)合回路，由串(chuan)聯(lian)處接(jie)(jie)(jie)至相(xiang)(xiang)(xiang)應的(de)線端(duan)(duan)。

星形、三角形、曲折形等聯接(jie)(jie)，現在對于高壓(ya)(ya)(ya)(ya)繞(rao)組(zu)(zu)分別(bie)(bie)用(yong)符(fu)號y、D、Z表(biao)示;對于中壓(ya)(ya)(ya)(ya)和(he)低(di)壓(ya)(ya)(ya)(ya)繞(rao)組(zu)(zu)分別(bie)(bie)用(yong)符(fu)號y、d、z表(biao)示。有中性點引(yin)出時(shi)則分別(bie)(bie)用(yong)符(fu)號YN、ZN和(he)yn、zn表(biao)示。三相變壓(ya)(ya)(ya)(ya)器按高壓(ya)(ya)(ya)(ya)、中壓(ya)(ya)(ya)(ya)和(he)低(di)壓(ya)(ya)(ya)(ya)繞(rao)組(zu)(zu)聯接(jie)(jie)的順序組(zu)(zu)合起來就是繞(rao)組(zu)(zu)的聯接(jie)(jie)組(zu)(zu)，例如:三相變壓(ya)(ya)(ya)(ya)器按高壓(ya)(ya)(ya)(ya)為D、低(di)壓(ya)(ya)(ya)(ya)為yn聯接(jie)(jie)，則繞(rao)組(zu)(zu)聯接(jie)(jie)組(zu)(zu)為Dyn(Dyn11);

三相變壓器接在電網上運行時，三相變壓器二次側電壓將由于種種原因發生變化，影響用電設備的工常運行。因此三相變壓器應具備一定的調壓能力。根據三相變壓器的工作原理，當高、低壓繞組的匝數比變化時，三相變壓器二次側電壓也隨之變動，采用改變三相變壓器匝數比即可達到調壓的目的。三相變壓器調壓方式通常分為無勵磁調壓和有載調壓兩種方式。當二次側不帶負載，一次側又與電網斷開時的調壓為無勵磁調壓，在二次側帶負載下的調壓為有載調壓。
　　　　

當三(san)相變壓(ya)(ya)(ya)(ya)器二次(ci)繞(rao)(rao)組(zu)開路，一次(ci)繞(rao)(rao)組(zu)施(shi)(shi)(shi)加(jia)額定頻率(lv)的(de)額定電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)時(shi)，一次(ci)繞(rao)(rao)組(zu)中所流過的(de)電(dian)(dian)(dian)(dian)流稱空載(zai)電(dian)(dian)(dian)(dian)流I0, 三(san)相變壓(ya)(ya)(ya)(ya)器空載(zai)合閘時(shi)有較大的(de)沖擊電(dian)(dian)(dian)(dian)流。當三(san)相變壓(ya)(ya)(ya)(ya)器二次(ci)側短路，一次(ci)側施(shi)(shi)(shi)加(jia)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)使其電(dian)(dian)(dian)(dian)流達到額定值，此時(shi)所施(shi)(shi)(shi)加(jia)的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)稱為阻抗電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)UZ，三(san)相變壓(ya)(ya)(ya)(ya)器從(cong)電(dian)(dian)(dian)(dian)源(yuan)吸取的(de)功率(lv)即(ji)為短路損耗。以阻抗電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)與(yu)額定電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)UN之比的(de)百分數表示。

三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)負(fu)(fu)(fu)載(zai)(zai)運行時，由于三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)內部的(de)(de)(de)阻抗(kang)壓(ya)(ya)降，二次電(dian)(dian)(dian)壓(ya)(ya)將隨負(fu)(fu)(fu)載(zai)(zai)電(dian)(dian)(dian)流和(he)負(fu)(fu)(fu)載(zai)(zai)功(gong)率(lv)(lv)(lv)因(yin)數(shu)的(de)(de)(de)改變而改變。電(dian)(dian)(dian)壓(ya)(ya)調整率(lv)(lv)(lv)即說明三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)二次電(dian)(dian)(dian)壓(ya)(ya)變化(hua)的(de)(de)(de)程度大小(xiao)，為衡量三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)供電(dian)(dian)(dian)質量的(de)(de)(de)數(shu)據，其定義為:在(zai)給定負(fu)(fu)(fu)載(zai)(zai)功(gong)率(lv)(lv)(lv)因(yin)數(shu)下 (一(yi)般取0.8)二次空載(zai)(zai)電(dian)(dian)(dian)壓(ya)(ya)U2N和(he)二次負(fu)(fu)(fu)載(zai)(zai)電(dian)(dian)(dian)壓(ya)(ya)U2之差(cha)與二次額定電(dian)(dian)(dian)壓(ya)(ya)U2N的(de)(de)(de)比。三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)的(de)(de)(de)效(xiao)率(lv)(lv)(lv)η為輸(shu)出的(de)(de)(de)有功(gong)功(gong)率(lv)(lv)(lv)與輸(shu)入的(de)(de)(de)有功(gong)功(gong)率(lv)(lv)(lv)之比的(de)(de)(de)百分數(shu)。通常中小(xiao)型(xing)三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)的(de)(de)(de)效(xiao)率(lv)(lv)(lv)約為90%以(yi)上，大型(xing)三(san)(san)(san)(san)相變壓(ya)(ya)器(qi)的(de)(de)(de)效(xiao)率(lv)(lv)(lv)在(zai)95%以(yi)上。

三相變(bian)(bian)壓(ya)器(qi)(qi)的(de)(de)溫(wen)(wen)(wen)(wen)(wen)升(sheng)，對(dui)于(yu)空氣(qi)冷(leng)(leng)卻三相變(bian)(bian)壓(ya)器(qi)(qi)是指(zhi)測量部(bu)位的(de)(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)與(yu)冷(leng)(leng)卻空氣(qi)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)之(zhi)差(cha);對(dui)于(yu)水冷(leng)(leng)卻三相變(bian)(bian)壓(ya)器(qi)(qi)是指(zhi)測量部(bu)位的(de)(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)與(yu)冷(leng)(leng)卻器(qi)(qi)入口處水溫(wen)(wen)(wen)(wen)(wen)之(zhi)差(cha)。油(you)(you)浸式三相變(bian)(bian)壓(ya)器(qi)(qi)繞組和頂層(ceng)油(you)(you)溫(wen)(wen)(wen)(wen)(wen)升(sheng)限值(zhi):因為A級絕(jue)(jue)緣(yuan)在980C時產生的(de)(de)絕(jue)(jue)緣(yuan)損壞為正(zheng)常損壞，而保(bao)證(zheng)三相變(bian)(bian)壓(ya)器(qi)(qi)正(zheng)常壽(shou)命的(de)(de)年平均(jun)氣(qi)溫(wen)(wen)(wen)(wen)(wen)是2O0C，繞組最(zui)熱點與(yu)其平均(jun)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)之(zhi)差(cha)為130C，所(suo)以繞組溫(wen)(wen)(wen)(wen)(wen)升(sheng)限值(zhi)為98-20-13二65K。油(you)(you)正(zheng)常運(yun)行(xing)的(de)(de)最(zui)高(gao)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)為950C，最(zui)高(gao)氣(qi)溫(wen)(wen)(wen)(wen)(wen)為400C，所(suo)以頂層(ceng)油(you)(you)溫(wen)(wen)(wen)(wen)(wen)升(sheng)限值(zhi)為95-40=55K。(2)冷(leng)(leng)卻方式  三相變(bian)(bian)壓(ya)器(qi)(qi)的(de)(de)冷(leng)(leng)卻方式有多種，如干式自冷(leng)(leng)、油(you)(you)浸風(feng)冷(leng)(leng)等，各種方式適(shi)用(yong)于(yu)不同種類的(de)(de)三相變(bian)(bian)壓(ya)器(qi)(qi)。