標題：帶電電纜識別儀

產品概述

產品介(jie)紹：

帶電電纜識別儀，由信號發生器和接收識別鉗及指示表三部分組成，用接收識別鉗信號檢測器時其它電纜線上檢測到的信號則要小很多且方向相反，通過電表指示幅度及方向，很容易判定被測電纜。

工作原理：

電(dian)(dian)(dian)(dian)纜(lan)(lan)識(shi)別儀，發(fa)生器將周期性(xing)的(de)單(dan)極(ji)性(xing)電(dian)(dian)(dian)(dian)壓脈(mo)沖饋(kui)入要(yao)識(shi)別的(de)電(dian)(dian)(dian)(dian)纜(lan)(lan)中(zhong)，該電(dian)(dian)(dian)(dian)纜(lan)(lan)需要(yao)在遠端(duan)接地，以保(bao)證(zheng)有足夠(gou)大的(de)電(dian)(dian)(dian)(dian)流流過電(dian)(dian)(dian)(dian)纜(lan)(lan)。該系統要(yao)設計成返回電(dian)(dian)(dian)(dian)流不要(yao)從(cong)同(tong)一(yi)電(dian)(dian)(dian)(dian)纜(lan)(lan)中(zhong)返回，能做到(dao)這一(yi)點，饋(kui)入電(dian)(dian)(dian)(dian)纜(lan)(lan)中(zhong)的(de)脈(mo)沖電(dian)(dian)(dian)(dian)流的(de)方向可做為一(yi)明顯的(de)識(shi)別標準，流出去的(de)電(dian)(dian)(dian)(dian)流僅從(cong)這一(yi)根(gen)電(dian)(dian)(dian)(dian)纜(lan)(lan)通(tong)過，所有其它鄰近電(dian)(dian)(dian)(dian)纜(lan)(lan)中(zhong)流過的(de)都是返回電(dian)(dian)(dian)(dian)流，但它們的(de)極(ji)性(xing)相反。

接收(shou)機(ji)的(de)(de)任務是探(tan)測(ce)流(liu)(liu)過電(dian)(dian)(dian)(dian)纜(lan)電(dian)(dian)(dian)(dian)流(liu)(liu)方向(xiang)以及它的(de)(de)大(da)小。為(wei)達到這一目的(de)(de)，電(dian)(dian)(dian)(dian)流(liu)(liu)卡(ka)(ka)(ka)鉗(qian)被(bei)用(yong)作傳感器，它帶有(you)(you)一放大(da)器并(bing)串聯在電(dian)(dian)(dian)(dian)路中(zhong)，卡(ka)(ka)(ka)鉗(qian)鉗(qian)住(zhu)被(bei)測(ce)電(dian)(dian)(dian)(dian)纜(lan)，電(dian)(dian)(dian)(dian)流(liu)(liu)流(liu)(liu)過電(dian)(dian)(dian)(dian)纜(lan)產(chan)生的(de)(de)磁場在卡(ka)(ka)(ka)鉗(qian)的(de)(de)線(xian)圈(quan)中(zhong)感應出電(dian)(dian)(dian)(dian)壓(ya)，該電(dian)(dian)(dian)(dian)壓(ya)極性(xing)由電(dian)(dian)(dian)(dian)流(liu)(liu)方向(xiang)和卡(ka)(ka)(ka)鉗(qian)線(xian)圈(quan)的(de)(de)方向(xiang)決定。為(wei)了得到明(ming)顯有(you)(you)電(dian)(dian)(dian)(dian)流(liu)(liu)方向(xiang)的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)極性(xing)，對(dui)一束(shu)電(dian)(dian)(dian)(dian)纜(lan)中(zhong)所有(you)(you)電(dian)(dian)(dian)(dian)纜(lan)進行(xing)測(ce)試都采取(qu)相同正確的(de)(de)繞組方向(xiang)，這就(jiu)是卡(ka)(ka)(ka)鉗(qian)上標有(you)(you)箭頭的(de)(de)原因。卡(ka)(ka)(ka)鉗(qian)上箭頭的(de)(de)方向(xiang)應指(zhi)向(xiang)電(dian)(dian)(dian)(dian)纜(lan)遠端，卡(ka)(ka)(ka)鉗(qian)線(xian)圈(quan)中(zhong)感應的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)在表頭中(zhong)顯示出來，如(ru)果卡(ka)(ka)(ka)鉗(qian)按上述方式連接，指(zhi)針(zhen)擺動方向(xiang)可顯示電(dian)(dian)(dian)(dian)流(liu)(liu)方向(xiang)，即只有(you)(you)電(dian)(dian)(dian)(dian)流(liu)(liu)流(liu)(liu)出的(de)(de)這根電(dian)(dian)(dian)(dian)纜(lan)指(zhi)針(zhen)向(xiang)右偏，這根就(jiu)是要找的(de)(de)電(dian)(dian)(dian)(dian)纜(lan)。所有(you)(you)其它電(dian)(dian)(dian)(dian)纜(lan)只流(liu)(liu)過返回電(dian)(dian)(dian)(dian)流(liu)(liu)，指(zhi)針(zhen)向(xiang)左偏、或無脈(mo)動電(dian)(dian)(dian)(dian)流(liu)(liu)，指(zhi)針(zhen)不偏轉(zhuan)。接收(shou)機(ji)上的(de)(de)放大(da)調(diao)節器可調(diao)整(zheng)信(xin)號強度。

外形尺寸：

主機外型尺寸：400mm×270mm×210mm

接收機外型尺寸：155mm×205mm×50mm

工作(zuo)方(fang)法：

帶電電纜識別儀，電纜識別儀信號發生器由交流電源供電，它對已斷電的、要識別的電纜加上固定周期單極性的直流脈沖。發生器輸出線連在電纜芯線和接地點或地釘上，該電纜線鎧裝與大地斷開，芯線在遠端與接地點或地釘相連，該回路可傳導脈沖電流，它可由識別儀上的表頭讀出，電流大小由環路電阻決定，環路電阻應盡可能小。識別儀接線圖如圖所示

發射(she)機與接(jie)(jie)收(shou)機開(kai)始正常工作后，傳(chuan)感(gan)器線圈中感(gan)應的電(dian)(dian)壓在接(jie)(jie)收(shou)機表頭(tou)中顯(xian)示(shi)(shi)出(chu)來，表頭(tou)指針擺動(dong)方向可顯(xian)示(shi)(shi)電(dian)(dian)流方向，即只(zhi)有電(dian)(dian)流流出(chu)的這根電(dian)(dian)纜指針向右偏并且(qie)擺幅(fu)較(jiao)大，這根就是要找的電(dian)(dian)纜。所有其它(ta)電(dian)(dian)纜只(zhi)流過(guo)返回(hui)電(dian)(dian)流，指針向左偏并且(qie)擺幅(fu)極小(xiao)。接(jie)(jie)收(shou)機上的輸出(chu)調節旋鈕可調整信號強度。

技術指(zhi)標：

1.儀器供(gong)電(dian)

電(dian)纜識別儀主機由(you)交(jiao)流220V供電(dian)。

2.傳感器

傳感器是一電(dian)(dian)流變換器，鉗口內(nei)部尺寸為120mm。當電(dian)(dian)流流過測試電(dian)(dian)纜，在傳感器內(nei)感應(ying)出電(dian)(dian)壓(ya)，電(dian)(dian)壓(ya)幅度由電(dian)(dian)流強度決定(ding)(ding)，其極性由電(dian)(dian)流方向決定(ding)(ding)。

3.安全測(ce)試

一定要進行(xing)以下(xia)安全測試，以避免(mian)造成(cheng)人員傷亡或損(sun)壞(huai)電(dian)纜識別儀及其它設(she)備。使用電(dian)纜識別儀時，要對被(bei)測電(dian)纜進行(xing)帶(dai)電(dian)檢查，并(bing)確保(bao)該電(dian)纜處于無電(dian)狀態。

將儀(yi)器接入被測電(dian)(dian)纜(lan)(lan)前(qian)，要(yao)對(dui)其附近末加保護(hu)的儀(yi)器或電(dian)(dian)纜(lan)(lan)進行(xing)安全檢(jian)查，并(bing)將這(zhe)些帶電(dian)(dian)部分(fen)用絕緣材(cai)料(liao)進行(xing)安全保護(hu)。