你所在的位置：三(san)(san)(san)相(xiang)(xiang)(xiang)(xiang)電(dian)能(neng)(neng)表(biao)(biao)是由(you)單相(xiang)(xiang)(xiang)(xiang)電(dian)能(neng)(neng)表(biao)(biao)發(fa)展形成(cheng)的(de)，同樣是由(you)驅(qu)動(dong)元件(jian)、轉動(dong)元件(jian)、軸承、制動(dong)元件(jian)、計(ji)度器以及(ji)輔助部件(jian)組成(cheng)。三(san)(san)(san)相(xiang)(xiang)(xiang)(xiang)電(dian)能(neng)(neng)報表(biao)(biao)和單相(xiang)(xiang)(xiang)(xiang)電(dian)能(neng)(neng)表(biao)(biao)的(de)區別在于每個三(san)(san)(san)相(xiang)(xiang)(xiang)(xiang)電(dian)能(neng)(neng)表(biao)(biao)都有(you)兩組或(huo)者三(san)(san)(san)組驅(qu)動(dong)元件(jian)，它們形成(cheng)的(de)電(dian)磁(ci)力作用(yong)于同一(yi)個轉動(dong)元件(jian)上，并用(yong)一(yi)個計(ji)度器顯示三(san)(san)(san)相(xiang)(xiang)(xiang)(xiang)測(ce)定的(de)電(dian)能(neng)(neng)，所有(you)部件(jian)都安裝在同一(yi)個表(biao)(biao)殼內。
三(san)(san)相(xiang)(xiang)電(dian)(dian)(dian)能表(biao)分為三(san)(san)相(xiang)(xiang)三(san)(san)元(yuan)(yuan)(yuan)件(jian)和(he)三(san)(san)相(xiang)(xiang)兩(liang)元(yuan)(yuan)(yuan)件(jian)兩(liang)類(lei)。三(san)(san)相(xiang)(xiang)兩(liang)元(yuan)(yuan)(yuan)件(jian)電(dian)(dian)(dian)能表(biao)有(you)三(san)(san)組電(dian)(dian)(dian)磁驅(qu)動(dong)系統(tong)，共用(yong)一個轉動(dong)機(ji)構(gou)(gou)，其(qi)轉盤(pan)(pan)可能是三(san)(san)轉盤(pan)(pan)、雙轉盤(pan)(pan)或單轉盤(pan)(pan)。三(san)(san)相(xiang)(xiang)兩(liang)元(yuan)(yuan)(yuan)件(jian)電(dian)(dian)(dian)能表(biao)有(you)兩(liang)組驅(qu)動(dong)元(yuan)(yuan)(yuan)件(jian)，轉動(dong)元(yuan)(yuan)(yuan)件(jian)也有(you)雙轉盤(pan)(pan)和(he)單轉盤(pan)(pan)兩(liang)種結構(gou)(gou)，考慮到元(yuan)(yuan)(yuan)件(jian)之間電(dian)(dian)(dian)磁干擾的不良影響(xiang)，單轉盤(pan)(pan)的三(san)(san)相(xiang)(xiang)電(dian)(dian)(dian)能表(biao)已不多見了。
三相(xiang)電(dian)能表的(de)轉(zhuan)動(dong)元(yuan)件共用一(yi)(yi)個轉(zhuan)軸(zhou)，轉(zhuan)軸(zhou)上(shang)的(de)轉(zhuan)盤彼(bi)此平行(xing)地安裝(zhuang)在公(gong)共軸(zhou)上(shang)。三相(xiang)電(dian)能表的(de)驅動(dong)力矩(ju)(ju)等于各元(yuan)件驅動(dong)力矩(ju)(ju)之和。對于三元(yuan)件雙盤三相(xiang)電(dian)能表，其中(zhong)兩組驅動(dong)元(yuan)件產生的(de)驅動(dong)力矩(ju)(ju)將(jiang)作用在同一(yi)(yi)個轉(zhuan)盤上(shang)，第三組驅動(dong)元(yuan)件產生的(de)驅動(dong)力矩(ju)(ju)作用在另(ling)一(yi)(yi)個轉(zhuan)盤上(shang)。
影響三相(xiang)(xiang)電能(neng)(neng)(neng)(neng)表負載特性的因(yin)素比(bi)單(dan)相(xiang)(xiang)電能(neng)(neng)(neng)(neng)表多，而且(qie)比(bi)較復(fu)雜(za)。因(yin)此，三相(xiang)(xiang)電能(neng)(neng)(neng)(neng)表除了(le)具有與單(dan)相(xiang)(xiang)電能(neng)(neng)(neng)(neng)表相(xiang)(xiang)同的調(diao)整裝置外，每組(zu)驅動(dong)元(yuan)件還增加(jia)了(le)平衡調(diao)整裝置，用來分別調(diao)整各元(yuan)件的驅動(dong)力矩(ju)，使(shi)電能(neng)(neng)(neng)(neng)表在不(bu)平衡的負載下，不(bu)致產(chan)生太大的附加(jia)誤(wu)差；通常三轉盤(pan)電能(neng)(neng)(neng)(neng)表的誤(wu)差，要比(bi)雙轉盤(pan)的誤(wu)差小。