單(dan)相有(you)功電(dian)(dian)度(du)(du)表(biao)(biao)(biao)（簡(jian)稱：單(dan)相電(dian)(dian)度(du)(du)表(biao)(biao)(biao)）由接線(xian)(xian)端(duan)(duan)(duan)子(zi)(zi)(zi)、電(dian)(dian)流(liu)線(xian)(xian)圈(quan)、電(dian)(dian)壓(ya)線(xian)(xian)圈(quan)、計量轉(zhuan)盤、計數器構成(cheng)，只(zhi)(zhi)要電(dian)(dian)流(liu)線(xian)(xian)圈(quan)通過電(dian)(dian)流(liu)，同(tong)時(shi)電(dian)(dian)壓(ya)線(xian)(xian)圈(quan)加有(you)電(dian)(dian)壓(ya)，轉(zhuan)盤就(jiu)受到電(dian)(dian)磁力(li)而轉(zhuan)動……單(dan)相電(dian)(dian)度(du)(du)表(biao)(biao)(biao)共有(you)5個接線(xian)(xian)端(duan)(duan)(duan)子(zi)(zi)(zi)，其中有(you)兩個端(duan)(duan)(duan)子(zi)(zi)(zi)在表(biao)(biao)(biao)的(de)(de)內(nei)部(bu)用(yong)連片短(duan)接，所以，單(dan)相電(dian)(dian)度(du)(du)表(biao)(biao)(biao)的(de)(de)外接端(duan)(duan)(duan)子(zi)(zi)(zi)只(zhi)(zhi)有(you)4個，即1、2、3、4號端(duan)(duan)(duan)子(zi)(zi)(zi)。由于電(dian)(dian)度(du)(du)表(biao)(biao)(biao)的(de)(de)型號不同(tong)，各類(lei)型的(de)(de)電(dian)(dian)表(biao)(biao)(biao)在鉛封蓋內(nei)都有(you)4各端(duan)(duan)(duan)子(zi)(zi)(zi)的(de)(de)接線(xian)(xian)圖。

家用電表接(jie)線原理(li)圖如下：

直接接入法：

如果負(fu)載的(de)功率在電度表允許的(de)范圍內，即(ji)流過電度表電流線(xian)(xian)圈的(de)電流不至(zhi)于導致線(xian)(xian)圈燒毀，那么就(jiu)采用直接(jie)接(jie)入法(fa)。

單相(xiang)電(dian)度表(biao)共有四個接線端子，從左至右按1、2、3、4編號。

接(jie)(jie)線(xian)(xian)(xian)一般有兩種(zhong)一般是(shi)1、3接(jie)(jie)進線(xian)(xian)(xian)，2、4接(jie)(jie)出線(xian)(xian)(xian)；另一種(zhong)是(shi)按1、2接(jie)(jie)進線(xian)(xian)(xian)，3、4接(jie)(jie)出線(xian)(xian)(xian)。無論何種(zhong)接(jie)(jie)法，相線(xian)(xian)(xian)（火線(xian)(xian)(xian)）必須(xu)接(jie)(jie)入(ru)電(dian)表的(de)電(dian)流線(xian)(xian)(xian)圈的(de)端子。由(you)于(yu)有些電(dian)表的(de)接(jie)(jie)線(xian)(xian)(xian)特殊(shu)，具體的(de)接(jie)(jie)線(xian)(xian)(xian)方法需(xu)要(yao)參照接(jie)(jie)線(xian)(xian)(xian)端子蓋板上的(de)接(jie)(jie)線(xian)(xian)(xian)圖去接(jie)(jie)。

經互感器接入法：

在(zai)用單相(xiang)電(dian)(dian)度(du)表測量(liang)大(da)電(dian)(dian)流的單相(xiang)電(dian)(dian)路的用電(dian)(dian)量(liang)時，應使用電(dian)(dian)流互感器(qi)(qi)進行電(dian)(dian)流變換，電(dian)(dian)流互感器(qi)(qi)接(jie)電(dian)(dian)度(du)表的電(dian)(dian)流線圈。接(jie)法有(you)兩種：

（1）單相電度表(biao)內5和(he)1端未斷開時(shi)的接法。

由于表內短接片沒有斷開，所(suo)以互(hu)感(gan)器的K2端子禁止接地。

以上(shang)就是電表(biao)的接法，以及家用(yong)電表(biao)接線圖(tu)。小編(bian)提醒大(da)家，家用(yong)電表(biao)在接線的時候要注意安全哦！