MD-3000電纜故障定位儀是(shi)公司開發出(chu)的新(xin)一代探測電纜故(gu)障(zhang)定位儀。采用了先進的DSP數(shu)字信號(hao)處理器、數(shu)字濾波(bo)，重點(dian)突出(chu)了抗噪聲功能、進一提高檢測儀(yi)(yi)的整機(ji)靈敏度、聽音清晰度及儀(yi)(yi)器(qi)自(zi)動判斷能(neng)力，儀(yi)(yi)器(qi)性能(neng)穩(wen)定(ding)、質量可靠、全中文菜單(dan)操作簡便(bian)。采用技術、自(zi)主知識產(chan)權是(shi)目前先進的電纜(lan)故障定(ding)位(wei)儀(yi)(yi)。
電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)測(ce)(ce)(ce)試(shi)(shi)中粗測(ce)(ce)(ce)距(ju)離是(shi)很容易的(de)(de)(de)。如果用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)測(ce)(ce)(ce)試(shi)(shi)儀主(zhu)(zhu)機(ji)來粗測(ce)(ce)(ce)的(de)(de)(de)話，一般只(zhi)要(yao)數分鐘便(bian)可測(ce)(ce)(ce)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)點(dian)至測(ce)(ce)(ce)試(shi)(shi)端的(de)(de)(de)粗略(lve)距(ju)離，而且粗測(ce)(ce)(ce)誤差(cha)一般不會超過幾(ji)十米。因此，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)粗測(ce)(ce)(ce)距(ju)離已(yi)不是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)尋(xun)測(ce)(ce)(ce)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)的(de)(de)(de)主(zhu)(zhu)要(yao)矛盾(dun)。大(da)(da)(da)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)測(ce)(ce)(ce)試(shi)(shi)實(shi)踐證明：電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)定(ding)點(dian)方面(mian)的(de)(de)(de)問題已(yi)成為快速尋(xun)測(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)的(de)(de)(de)主(zhu)(zhu)要(yao)矛盾(dun)。即(ji)具體(ti)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)定(ding)點(dian)則是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)測(ce)(ce)(ce)試(shi)(shi)中的(de)(de)(de)為關鍵的(de)(de)(de)一步，現在(zai)越來越多的(de)(de)(de)使用交(jiao)聯電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)，而交(jiao)聯電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)大(da)(da)(da)部分為封閉(bi)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)點(dian)的(de)(de)(de)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)聲往(wang)往(wang)在(zai)十幾(ji)米甚(shen)至幾(ji)十米都(dou)有幾(ji)乎一樣(yang)大(da)(da)(da)的(de)(de)(de)響聲，這給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)定(ding)點(dian)帶來了(le)很大(da)(da)(da)的(de)(de)(de)困難，另外(wai)在(zai)實(shi)際電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)定(ding)點(dian)中，由(you)于測(ce)(ce)(ce)試(shi)(shi)人(ren)遠離測(ce)(ce)(ce)試(shi)(shi)端，當尚未聽到(dao)由(you)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)故(gu)(gu)(gu)(gu)(gu)(gu)障(zhang)(zhang)(zhang)點(dian)傳出的(de)(de)(de)地震波時(shi)，心(xin)情往(wang)往(wang)會急燥起來，甚(shen)至會懷(huai)疑高(gao)壓放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)設備沒有工作(zuo)。有時(shi)在(zai)有脈沖聲源的(de)(de)(de)干擾背景中往(wang)往(wang)需要(yao)知道(dao)自己(ji)聽到(dao)的(de)(de)(de)聲波是(shi)否(fou)與(yu)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)設備的(de)(de)(de)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)周期同(tong)步，否(fou)則就無(wu)法作(zuo)出后的(de)(de)(de)判(pan)斷。
MD-3000電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)位儀采用(yong)本公司所*的(de)(de)(de)(de)電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)點新理論(lun)。是本公司根據新研究成果(guo)而(er)開發的(de)(de)(de)(de)具(ju)(ju)有(you)高(gao)(gao)抗干擾性，高(gao)(gao)靈敏度，新型的(de)(de)(de)(de)電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)點測試(shi)儀器(qi)。MD-3000電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)點儀器(qi)采用(yong)先進的(de)(de)(de)(de)模擬低(di)噪聲設(she)計和(he)(he)高(gao)(gao)性能濾波(bo)電(dian)(dian)(dian)路相結合，使MD-3000電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)點儀抗干擾性能有(you)了(le)大的(de)(de)(de)(de)提高(gao)(gao)，采用(yong)*設(she)計和(he)(he)*地裝配工藝使MD-3000電(dian)(dian)(dian)纜故障(zhang)定(ding)(ding)點儀具(ju)(ju)有(you)目前國內高(gao)(gao)水準(zhun)。對各類電(dian)(dian)(dian)纜故障(zhang)可地進行定(ding)(ding)點，特別是對交聯電(dian)(dian)(dian)纜和(he)(he)電(dian)(dian)(dian)纜封閉性電(dian)(dian)(dian)纜故障(zhang)具(ju)(ju)有(you)獨到的(de)(de)(de)(de)測試(shi)效果(guo)。是電(dian)(dian)(dian)纜故障(zhang)測試(shi)儀器(qi)中新的(de)(de)(de)(de)更新換代產品。
MD-3000電(dian)纜故(gu)障定(ding)位儀性能介紹:故(gu)障點放電(dian)時會產生聲波和(he)電(dian)磁波，聲波和(he)電(dian)磁波之(zhi)間又有一定(ding)的內(nei)在，利用好(hao)它們(men)(men)之(zhi)間的表(biao)象(xiang)及(ji)，可(ke)使我們(men)(men)準、快、易找到(dao)故(gu)障點。 
一、電磁波
本電纜故障定點儀可(ke)以接收電纜故障點放(fang)電產生的電磁波，并經數(shu)字處理、放(fang)大(da)通過液(ye)晶(jing)以光(guang)柱及數(shu)字方式連(lian)續(xu)顯示。
電纜故(gu)障(zhang)預定位：沿地(di)下電纜走(zou)向邊走(zou)邊觀(guan)察，信號突然減小(xiao)的(de)地(di)方就可(ke)能是故(gu)障(zhang)的(de)大致位置（一定區(qu)域(yu)內）。由于此項功能加入使得(de)故(gu)障(zhang)的(de)探測變的(de)簡單(dan)而迅速。
尋電纜(lan)(lan)(lan)路(lu)徑：沿地下電纜(lan)(lan)(lan)Z字(zi)型行走，信(xin)號大(da)處為電纜(lan)(lan)(lan)正上(shang)方，電纜(lan)(lan)(lan)兩邊(bian)信(xin)號減小。由(you)此可判斷電纜(lan)(lan)(lan)的大(da)致路(lu)徑。
二、聲波
電(dian)纜故(gu)障(zhang)點放電(dian)的(de)聲(sheng)波(bo)強度(du)以往都(dou)是通過(guo)耳機(ji)傳(chuan)到耳朵中并通過(guo)耳朵來判斷聲(sheng)音的(de)大(da)小(xiao)，而(er)耳朵的(de)分辨率不會很高，特別是現(xian)在的(de)交聯電(dian)纜放電(dian)聲(sheng)在一(yi)定范圍內(nei)幾乎一(yi)樣大(da)小(xiao)用(yong)耳朵是不容易區分的(de)，而(er)MD-3000電(dian)纜故(gu)障(zhang)定點儀可(ke)以時(shi)(shi)時(shi)(shi)記錄放電(dian)聲(sheng)波(bo)的(de)大(da)小(xiao)，通過(guo)儀器來判斷大(da)小(xiao)，大(da)得提高了可(ke)靠性和準確性。
本電(dian)(dian)纜(lan)(lan)故障(zhang)定點(dian)儀高(gao)增益(yi)的(de)(de)(de)(de)放(fang)(fang)大倍數（90Db）是保證電(dian)(dian)纜(lan)(lan)故障(zhang)測(ce)試準確(que)性的(de)(de)(de)(de)又一(yi)關鍵因(yin)素，測(ce)過電(dian)(dian)纜(lan)(lan)故障(zhang)的(de)(de)(de)(de)人都知(zhi)道碰到電(dian)(dian)纜(lan)(lan)封閉故障(zhang)時我們往往會束手無策，這是因(yin)為電(dian)(dian)纜(lan)(lan)故障(zhang)定點(dian)儀的(de)(de)(de)(de)放(fang)(fang)大倍數不(bu)夠（過去(qu)濾(lv)波技(ji)術不(bu)高(gao)，所以(yi)不(bu)敢將(jiang)定點(dian)儀過高(gao)的(de)(de)(de)(de)放(fang)(fang)大）。大提高(gao)了(le)放(fang)(fang)大倍數，并有(you)很好的(de)(de)(de)(de)濾(lv)波效果，濾(lv)波器的(de)(de)(de)(de)寬帶選擇可(ke)以(yi)有(you)效排除環境(jing)噪(zao)聲(sheng)的(de)(de)(de)(de)干擾（如風聲(sheng)、車(che)輛聲(sheng)等）。解決了(le)過去(qu)無法(fa)解決的(de)(de)(de)(de)難題。

三、電磁(ci)波與聲波
電(dian)(dian)纜(lan)故障點的放電(dian)(dian)除產生聲音信號外，同(tong)時也發出沿電(dian)(dian)纜(lan)擴散的電(dian)(dian)磁波。可以同(tong)步接收(shou)并顯示(shi)聲波及(ji)(ji)電(dian)(dian)磁波，并可測(ce)出聲波和電(dian)(dian)磁波信號的時間差并以此推(tui)算出拾音器(qi)到故障點的距離。對于穿管電(dian)(dian)纜(lan)及(ji)(ji)封閉性(xing)電(dian)(dian)纜(lan)故障定位有很好的效果。此種方法(fa)的優點是，電(dian)(dian)纜(lan)故障的定位與信號的強(qiang)度無(wu)關。