電(dian)力電(dian)纜(lan)(lan)(lan)(lan)架設(she)、遷移(yi)維護以及故障(zhang)處理(li)中將某一特點電(dian)纜(lan)(lan)(lan)(lan)從一束電(dian)纜(lan)(lan)(lan)(lan)中識別出來，稱電(dian)纜(lan)(lan)(lan)(lan)識別儀。給需(xu)要識別電(dian)纜(lan)(lan)(lan)(lan)發射一種(zhong)特殊信(xin)號，接(jie)收機接(jie)受信(xin)號的原理(li)識別要找的電(dian)纜(lan)(lan)(lan)(lan)。

發生器(qi)發射(she)出(chu)周期性(xing)(xing)的(de)脈沖，饋(kui)入到(dao)被(bei)使(shi)用的(de)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)中(zhong)，為(wei)保(bao)證有(you)足(zu)夠電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)流(liu)(liu)(liu)過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，被(bei)測試電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)需遠端接(jie)地。被(bei)測電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)不(bu)能從同(tong)(tong)一(yi)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)返回(hui)，即可(ke)從饋(kui)入電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)中(zhong)的(de)明線脈沖電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)方(fang)向識(shi)別電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)。反之，相鄰電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)將(jiang)(jiang)返回(hui)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，極性(xing)(xing)相反。電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)幅(fu)度也是(shi)識(shi)別特征(zheng)，流(liu)(liu)(liu)出(chu)去的(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)只通過(guo)一(yi)根(gen)線，返回(hui)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)可(ke)通過(guo)幾根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，表示(shi)流(liu)(liu)(liu)出(chu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)比低(di)流(liu)(liu)(liu)進(jin)其他電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)發回(hui)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)大。接(jie)收器(qi)將(jiang)(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)方(fang)向和大小(xiao)接(jie)收，電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)傳(chuan)(chuan)感器(qi)用來作為(wei)傳(chuan)(chuan)感器(qi)，串(chuan)聯(lian)一(yi)個放大器(qi)在電(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)，傳(chuan)(chuan)感器(qi)鉗(qian)住(zhu)被(bei)測電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)流(liu)(liu)(liu)過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)將(jiang)(jiang)產生磁場，在傳(chuan)(chuan)感器(qi)的(de)線圈(quan)(quan)中(zhong)感應(ying)電(dian)(dian)(dian)(dian)(dian)(dian)壓，該電(dian)(dian)(dian)(dian)(dian)(dian)壓極性(xing)(xing)由電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)方(fang)向和傳(chuan)(chuan)感器(qi)線圈(quan)(quan)的(de)方(fang)向決定。顯示(shi)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)方(fang)向的(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓極性(xing)(xing)，將(jiang)(jiang)一(yi)束電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)所(suo)在電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)進(jin)行(xing)相同(tong)(tong)方(fang)向測試，傳(chuan)(chuan)感器(qi)線圈(quan)(quan)中(zhong)感應(ying)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓表頭顯示(shi)出(chu)來，傳(chuan)(chuan)感器(qi)連接(jie)方(fang)式(shi)不(bu)變(bian)，所(suo)有(you)指針偏向一(yi)邊(bian)或無脈動電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)只流(liu)(liu)(liu)過(guo)返回(hui)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。

通過重要(yao)的(de)電流方向和電流幅度作為判斷指標(biao)，雙重判斷指標(biao)更(geng)準確識別電纜。