單相(xiang)(xiang)有功電(dian)(dian)(dian)度表（簡稱：單相(xiang)(xiang)電(dian)(dian)(dian)度表）由接(jie)線(xian)(xian)(xian)端(duan)(duan)子(zi)、電(dian)(dian)(dian)流線(xian)(xian)(xian)圈、電(dian)(dian)(dian)壓(ya)(ya)線(xian)(xian)(xian)圈、計量轉盤、計數器構成，只(zhi)要電(dian)(dian)(dian)流線(xian)(xian)(xian)圈通(tong)過電(dian)(dian)(dian)流，同時電(dian)(dian)(dian)壓(ya)(ya)線(xian)(xian)(xian)圈加有電(dian)(dian)(dian)壓(ya)(ya)，轉盤就受到電(dian)(dian)(dian)磁力(li)而(er)轉動……單相(xiang)(xiang)電(dian)(dian)(dian)度表共有5個接(jie)線(xian)(xian)(xian)端(duan)(duan)子(zi)，其中有兩個端(duan)(duan)子(zi)在表的(de)內部用連片短接(jie)，所以，單相(xiang)(xiang)電(dian)(dian)(dian)度表的(de)外接(jie)端(duan)(duan)子(zi)只(zhi)有4個，即1、2、3、4號(hao)(hao)端(duan)(duan)子(zi)。由于電(dian)(dian)(dian)度表的(de)型號(hao)(hao)不同，各類(lei)型的(de)電(dian)(dian)(dian)表在鉛封蓋內都(dou)有4各端(duan)(duan)子(zi)的(de)接(jie)線(xian)(xian)(xian)圖。

家用電表(biao)接線原理圖(tu)如(ru)下(xia)：

直接接入法：

如(ru)果負載的(de)功(gong)率在電(dian)(dian)度表允(yun)許的(de)范(fan)圍內，即(ji)流過電(dian)(dian)度表電(dian)(dian)流線(xian)圈(quan)的(de)電(dian)(dian)流不至(zhi)于導致線(xian)圈(quan)燒毀，那么就采(cai)用直接接入(ru)法。

單相電度表共有四個接線端(duan)子，從左至(zhi)右按(an)1、2、3、4編號。

接(jie)(jie)(jie)(jie)線(xian)(xian)(xian)(xian)一(yi)般有(you)(you)兩(liang)種(zhong)一(yi)般是1、3接(jie)(jie)(jie)(jie)進線(xian)(xian)(xian)(xian)，2、4接(jie)(jie)(jie)(jie)出線(xian)(xian)(xian)(xian)；另(ling)一(yi)種(zhong)是按1、2接(jie)(jie)(jie)(jie)進線(xian)(xian)(xian)(xian)，3、4接(jie)(jie)(jie)(jie)出線(xian)(xian)(xian)(xian)。無論何種(zhong)接(jie)(jie)(jie)(jie)法，相線(xian)(xian)(xian)(xian)（火線(xian)(xian)(xian)(xian)）必須接(jie)(jie)(jie)(jie)入(ru)電(dian)表的(de)電(dian)流線(xian)(xian)(xian)(xian)圈的(de)端(duan)子(zi)。由(you)于有(you)(you)些電(dian)表的(de)接(jie)(jie)(jie)(jie)線(xian)(xian)(xian)(xian)特(te)殊，具體的(de)接(jie)(jie)(jie)(jie)線(xian)(xian)(xian)(xian)方法需要參照接(jie)(jie)(jie)(jie)線(xian)(xian)(xian)(xian)端(duan)子(zi)蓋板上的(de)接(jie)(jie)(jie)(jie)線(xian)(xian)(xian)(xian)圖(tu)去接(jie)(jie)(jie)(jie)。

經互感器接入法：

在用(yong)單(dan)相電(dian)(dian)度表測量(liang)大電(dian)(dian)流(liu)(liu)的(de)單(dan)相電(dian)(dian)路的(de)用(yong)電(dian)(dian)量(liang)時，應(ying)使用(yong)電(dian)(dian)流(liu)(liu)互(hu)感器進行電(dian)(dian)流(liu)(liu)變換，電(dian)(dian)流(liu)(liu)互(hu)感器接電(dian)(dian)度表的(de)電(dian)(dian)流(liu)(liu)線圈。接法有兩種：

（1）單相電度(du)表內5和1端未斷(duan)開(kai)時的接法(fa)。

由于表內短接片沒有斷(duan)開，所以互感(gan)器的K2端子禁(jin)止接地。

以(yi)上就是電(dian)表的(de)接(jie)法，以(yi)及家(jia)用(yong)電(dian)表接(jie)線圖。小編(bian)提醒大家(jia)，家(jia)用(yong)電(dian)表在接(jie)線的(de)時候要(yao)注意安全哦(e)！