定(ding)點(dian)(dian)(dian)是電(dian)(dian)(dian)(dian)纜故(gu)(gu)(gu)障(zhang)測試(shi)(shi)中的(de)(de)(de)(de)最為關鍵的(de)(de)(de)(de)一(yi)步(bu)，現在越來越多的(de)(de)(de)(de)使用交聯電(dian)(dian)(dian)(dian)纜，而交聯電(dian)(dian)(dian)(dian)纜的(de)(de)(de)(de)故(gu)(gu)(gu)障(zhang)大部分為封閉故(gu)(gu)(gu)障(zhang)，故(gu)(gu)(gu)障(zhang)點(dian)(dian)(dian)的(de)(de)(de)(de)放(fang)電(dian)(dian)(dian)(dian)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)往(wang)(wang)往(wang)(wang)在十幾米甚至幾十米都有(you)(you)幾乎一(yi)樣大的(de)(de)(de)(de)響(xiang)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)，這給定(ding)點(dian)(dian)(dian)帶來了很大的(de)(de)(de)(de)困難，靠傳(chuan)統的(de)(de)(de)(de)聽聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)法及機械表(biao)頭(tou)擺動來判斷故(gu)(gu)(gu)障(zhang)點(dian)(dian)(dian)顯(xian)然已滿足不了電(dian)(dian)(dian)(dian)纜故(gu)(gu)(gu)障(zhang)測試(shi)(shi)要求(qiu)。另外在實際定(ding)點(dian)(dian)(dian)中，由于測試(shi)(shi)人遠離測試(shi)(shi)端，當尚未(wei)聽到由故(gu)(gu)(gu)障(zhang)點(dian)(dian)(dian)傳(chuan)出(chu)的(de)(de)(de)(de)地(di)震波(bo)時(shi)，心情往(wang)(wang)往(wang)(wang)會急(ji)躁起來，甚至會懷疑放(fang)電(dian)(dian)(dian)(dian)設備沒有(you)(you)工作。有(you)(you)時(shi)在有(you)(you)脈沖(chong)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)源的(de)(de)(de)(de)干(gan)擾背景中往(wang)(wang)往(wang)(wang)需要知道自己聽到的(de)(de)(de)(de)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)是否與(yu)(yu)放(fang)電(dian)(dian)(dian)(dian)設備的(de)(de)(de)(de)放(fang)電(dian)(dian)(dian)(dian)周(zhou)期同(tong)(tong)步(bu)，LDSC聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)磁數(shu)顯(xian)同(tong)(tong)步(bu)定(ding)點(dian)(dian)(dian)儀(yi)可(ke)同(tong)(tong)時(shi)接(jie)收(shou)放(fang)電(dian)(dian)(dian)(dian)時(shi)產(chan)生的(de)(de)(de)(de)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)及電(dian)(dian)(dian)(dian)磁波(bo)，并通過信(xin)號(hao)處(chu)理(li)計算出(chu)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)與(yu)(yu)電(dian)(dian)(dian)(dian)磁波(bo)的(de)(de)(de)(de)時(shi)間差。同(tong)(tong)時(shi)儀(yi)器(qi)還可(ke)將(jiang)接(jie)收(shou)到聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)與(yu)(yu)電(dian)(dian)(dian)(dian)磁波(bo)并以一(yi)定(ding)形式顯(xian)示出(chu)來，根據上述(shu)所接(jie)收(shou)的(de)(de)(de)(de)信(xin)號(hao)可(ke)以比較容易地(di)確定(ding)電(dian)(dian)(dian)(dian)纜故(gu)(gu)(gu)障(zhang)點(dian)(dian)(dian)，此種(zhong)方法叫聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)磁同(tong)(tong)步(bu)法。聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)磁同(tong)(tong)步(bu)法可(ke)以測試(shi)(shi)除金(jin)屬性短路(lu)以外的(de)(de)(de)(de)所有(you)(you)加高壓脈沖(chong)信(xin)號(hao)后(hou)故(gu)(gu)(gu)障(zhang)點(dian)(dian)(dian)能發出(chu)放(fang)電(dian)(dian)(dian)(dian)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)音的(de)(de)(de)(de)故(gu)(gu)(gu)障(zhang)。

操作步驟如下：

⑴、聲磁同步定點儀由定點主(zhu)機、定位(wei)傳(chuan)感器(qi)、耳機三(san)部分組成。

⑵、只有知道(dao)了電(dian)(dian)纜的(de)(de)走(zou)向，才能找到故障點，路徑信號來(lai)源于放(fang)電(dian)(dian)產生(sheng)的(de)(de)電(dian)(dian)磁(ci)波(bo)，每(mei)放(fang)一(yi)次(ci)電(dian)(dian)，路徑信號也同(tong)步刷新一(yi)次(ci)，定點的(de)(de)時(shi)候，我們可以把高(gao)壓發生(sheng)器的(de)(de)放(fang)電(dian)(dian)頻率適當的(de)(de)提高(gao)到2-3秒(miao)放(fang)一(yi)次(ci)電(dian)(dian)，提高(gao)找路徑的(de)(de)效率。

⑶、打開定(ding)(ding)點儀，選(xuan)擇“聲磁”菜單，向(xiang)(xiang)故障點前進方向(xiang)(xiang)走(zou)(zou)15米(mi)左右，在電(dian)纜上方順時針(zhen)方向(xiang)(xiang)調節路徑增(zeng)益(yi)，增(zeng)益(yi)一(yi)般(ban)先(xian)調30度左右，如果(guo)路徑顯示是藍色圓形標，表(biao)示我(wo)們在電(dian)纜的(de)右側(ce)，如果(guo)顯示的(de)是橙色的(de)圖形，表(biao)示我(wo)們在電(dian)纜的(de)左側(ce)，路徑誤差(cha)在10厘米(mi)左右，通過(guo)這樣左右走(zou)(zou)動來確定(ding)(ding)路徑。如果(guo)增(zeng)益(yi)調的(de)過(guo)大，信號(hao)過(guo)強，走(zou)(zou)偏12米(mi)左右才沒有信號(hao)。如果(guo)增(zeng)益(yi)適合，走(zou)(zou)偏3-4米(mi)就沒有信號(hao)。

⑷、有些低(di)壓電(dian)纜(lan)加高壓時整(zheng)條都(dou)有“啪(pa)(pa)啪(pa)(pa)”的(de)(de)放電(dian)聲音，一般的(de)(de)操作人員無法判斷(duan)哪個(ge)(ge)才(cai)是真(zhen)正的(de)(de)故(gu)障(zhang)點發出的(de)(de)聲音，只有多年經驗(yan)的(de)(de)才(cai)能判斷(duan)。我們儀器(qi)徹底(di)的(de)(de)解決了這個(ge)(ge)問(wen)題，通過聲磁同步(bu)告訴你故(gu)障(zhang)點距離，真(zhen)正的(de)(de)故(gu)障(zhang)點是會產生震動波形。

⑸、在接近故(gu)障(zhang)(zhang)(zhang)點(dian)(dian)時，定點(dian)(dian)儀就會顯示故(gu)障(zhang)(zhang)(zhang)距(ju)離(li)及震(zhen)動(dong)波形(xing)，如果故(gu)障(zhang)(zhang)(zhang)距(ju)離(li)只(zhi)(zhi)顯示一(yi)次(ci)(ci)之后就沒有新(xin)的(de)(de)數據出(chu)現，這個(ge)點(dian)(dian)就不是(shi)(shi)故(gu)障(zhang)(zhang)(zhang)點(dian)(dian)，是(shi)(shi)人為的(de)(de)移(yi)動(dong)傳感器產(chan)生的(de)(de)，只(zhi)(zhi)要高壓每閃絡一(yi)次(ci)(ci)，故(gu)障(zhang)(zhang)(zhang)距(ju)離(li)也(ye)跟著刷新(xin)一(yi)次(ci)(ci)，這才(cai)是(shi)(shi)真(zhen)正的(de)(de)故(gu)障(zhang)(zhang)(zhang)點(dian)(dian)。故(gu)障(zhang)(zhang)(zhang)距(ju)離(li)隨著故(gu)障(zhang)(zhang)(zhang)點(dian)(dian)距(ju)離(li)變化而變，震(zhen)動(dong)波越(yue)是(shi)(shi)靠近故(gu)障(zhang)(zhang)(zhang)點(dian)(dian)，震(zhen)動(dong)的(de)(de)幅值就越(yue)大(da)。

⑹、電纜故障在定(ding)位的時候，我們要(yao)腳步(bu)放(fang)(fang)慢，走(zou)在電纜上方或(huo)邊緣，定(ding)點儀(yi)的傳(chuan)感器要(yao)輕(qing)放(fang)(fang)，耳機聲(sheng)(sheng)音適當調大些，仔細分辨耳機傳(chuan)出來(lai)(lai)的聲(sheng)(sheng)音，要(yao)有耐心，靜下心來(lai)(lai)聽。如果(guo)聽到了有節奏的放(fang)(fang)電聲(sheng)(sheng)音，再根據儀(yi)器聲(sheng)(sheng)磁同步(bu)顯(xian)示提示，那(nei)肯定(ding)就是故障點了。

電纜故障(zhang)是多種的，呈(cheng)現的波形也是多樣的，只要(yao)我們接線(xian)方式正(zheng)確，注意(yi)細節，仔細判斷，通過后(hou)期(qi)經驗(yan)的積累，故障(zhang)點(dian)就會很(hen)快(kuai)找到(dao)。

武漢龍電電氣專業生產電纜故障測試儀，從事于電力行業多年(nian)，旗(qi)下產品(pin)品(pin)質(zhi)一流，歡迎廣大(da)客戶(hu)前(qian)來選購。