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<li id="khwbikeckeb" class="left_nav_xl"><a href="/SonList-1384347.html" title="LCR數(shù)字電橋系列">LCR數(shù)字電橋系列</a></li> </div> </ul> <li><a href="/ParentList-1408385.html" title="同高電子" onmouseover="showsubmenu('同高電子')" class="on">同高電子</a></li> <ul> <div class="khwbikeckeb" id="submenu_同高電子" style="display:none"> <li id="khwbikeckeb" class="left_nav_xl"><a href="/SonList-1408386.html" title="壓敏電阻測試儀">壓敏電阻測試儀</a></li> </div> </ul> </ul> </div> <div id="khwbikeckeb" class="page-right"> <div id="khwbikeckeb" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > 電纜故障點(diǎn)的幾種實(shí)用測定方法</div> <div id="khwbikeckeb" class="page-news"> <div id="khwbikeckeb" class="newshowheader"> <h1 class="nd_title">電纜故障點(diǎn)的幾種實(shí)用測定方法</h1> <div id="khwbikeckeb" class="article-info"> <span> 瀏覽：</span> 1437<span id="khwbikeckeb" class="split">|</span> <span id="publishtime">更新時(shí)間：2024-04-14</span> <span id="khwbikeckeb" class="split">|</span> </div> </div> <div id="khwbikeckeb" class="page-newshow"> <p><span style="font-size: 16px;"><strong><span style="font-family:宋體">電纜故障點(diǎn)的幾種實(shí)用測定方法</span></strong></span><br/></p><p><span style="font-family: 宋體; font-size: 16px;">一、電纜故障的品種與判別不管是高壓電纜或者低壓電纜，在動(dòng)土裝配、運(yùn)行進(jìn)程中時(shí)常因短路、過載荷運(yùn)行、盡緣老化或者外力敗壞等緣由形成故障。電纜故障分成接地、短路、斷線二類。</span></p><p><span style="font-family: 宋體; font-size: 16px;">三芯電纜故障范例首要有以次幾上面：</span></p><p><span style="font-family: 宋體; font-size: 16px;">一芯或者兩芯接觸；二相芯線間短路；三相芯線*短路；一相芯線斷線或者多相斷線。關(guān)于直接短路或者斷線故障用萬用表可直接丈量判別，關(guān)于非直接短路和接池故障，用兆歐表遙測芯線間絕緣電阻或者芯線對于地絕緣電阻，依據(jù)其阻值可斷定故障范例。電纜故障檢測儀</span></p><p><span style="font-family: 宋體; font-size: 16px;">二、電纜故障點(diǎn)的查找辦法</span></p><p><span style="font-family: 宋體; font-size: 16px;">1、測聲法叫做測聲法便是依據(jù)故障電纜放電的聲響進(jìn)行查找，該辦法關(guān)于高壓電纜芯線對于涂層閃絡(luò)放電較為有用。此辦法所用設(shè)備為直流耐壓實(shí)驗(yàn)機(jī)。電路接線如圖1所示，內(nèi)中SYB為高壓實(shí)驗(yàn)變壓器，C為高壓容電器，ZL為高壓整組硅堆，R為限流電阻，Q為放電球間隙，L為電纜芯線。當(dāng)容電器C充電到定然電壓值時(shí)，球間隙對于電纜故障芯線放電，在故障處電纜芯線對于涂層放電產(chǎn)生"滋、滋"的火花放電聲，再在雜噪音響zui小的時(shí)分，憑借聾啞助聽器或者醫(yī)用聽診器等音頻縮小設(shè)備進(jìn)行查找。查找時(shí)，將電唱頭切近天空，沿電纜動(dòng)向漸漸挪動(dòng)，當(dāng)聽見"滋、滋"放電聲zui大時(shí)，該處即為故障點(diǎn)。運(yùn)用該辦法定然要注意保險(xiǎn)，在實(shí)驗(yàn)設(shè)備端和電纜結(jié)尾應(yīng)設(shè)代表監(jiān)督。</span></p><p><span style="font-family: 宋體; font-size: 16px;">2、電橋法電橋法便是雙臂電橋測出電纜芯線的直流電阻值，再丈量電纜實(shí)踐長短，依照電纜長短與電阻的反比例關(guān)系，打算的故障點(diǎn)。該辦法關(guān)于電纜芯線間直接短路或者短路點(diǎn)接觸電阻小于1Ω的故障，判別誤差正常不大于3m，關(guān)于故障點(diǎn)接觸電阻大于1Ω的故障，可采納加高電壓燒穿的辦法使電阻降至1Ω以次，再按此辦法丈量。丈量電路測出芯線a與b之間的電阻R1，則R1＝2RX＋R，內(nèi)中R為a相或者b相至故障點(diǎn)的一相電阻值，R為短接點(diǎn)的接觸電阻。再就電纜的另一端測出a’和b’芯線間的直流電阻值R2，則R2＝2R（L－X）＋R，式中R（L－X）為a’相和b’相芯線至故障點(diǎn)的一相電阻值。測完R1與R2后，再按圖3所示電路將b’與C’短接，測出b、c兩相芯線間的直流電阻值，則該阻值的1/2為每相芯線的電阻值，用RL示意。RL＝RX＋R（L－X），由此可得出故障點(diǎn)的接觸電阻值：R＝R1＋R2－2RL。因而，故障點(diǎn)兩側(cè)芯線的電阻值可用下式示意：RX＝（R1－R）/2，R（L－X）＝（R2－R）/2。RX、R（L－X）、RL三個(gè)數(shù)值肯定后，按對比公式即可求出故障點(diǎn)距電纜端頭的間隔X或者（L－X）：X＝（RX/RL）L，（L－X）＝（R（L－X）/RL）L，式中L為電纜的總長短。采納電橋法時(shí)應(yīng)保障丈量精密度，電橋聯(lián)接線要盡量短，經(jīng)徑要剩余大，與電纜芯線聯(lián)接要采納壓接或者焊摟，打算進(jìn)程中小數(shù)位要全副銷毀。</span></p><p><span style="font-family: 宋體; font-size: 16px;">3、電容電流測定法電纜在運(yùn)行中，芯線之間、芯線對于地都具有電容，該電容是勻稱散布的，電定量與電纜長短呈線性對比關(guān)系，電容電流測定法便是依據(jù)這一道理進(jìn)行測定的，關(guān)于電纜芯線斷線故障的測定無比。測量電路如圖4所示，運(yùn)用設(shè)備為1～2kVA單相調(diào)壓器一臺(tái)，0～30V、0.5級交流電壓表一只，0～100mA、0.5級交流毫安表一只。測量方法：</span></p><p><span style="font-family: 宋體; font-size: 16px;">（1）在電纜首端辨別測出每芯線的電容電流（應(yīng)維持強(qiáng)加電壓相同）Ia、Ib、Ic的數(shù)值。</span></p><p><span style="font-family: 宋體; font-size: 16px;">（2）在電纜的結(jié)尾再測量每相芯線的電容電流Ia’、Ib’、Ic’的數(shù)值，以核查完整芯線與斷線芯線的比容之比，開端可判別出斷線間隔相近點(diǎn)。</span></p><p><span style="font-family: 宋體; font-size: 16px;">（3）依據(jù)電定量打算公式C＝1/2πfU可知，在電壓U、頻次f一成不變時(shí)C與I成反比；由于工頻電壓的f（頻次）一成不變，測量時(shí)只需保障強(qiáng)加電壓一成不變，電容電流之比即為電定量之比。設(shè)電纜全長L，芯線斷線點(diǎn)間隔為x，則Ia/Ic＝L/x，x＝（Ic/Ia）L。測量進(jìn)程中，只需保障電壓一成不變，電流表讀數(shù)，電纜總長短測量準(zhǔn)確，其測定誤差比擬小。</span></p><p><span style="font-family: 宋體; font-size: 16px;">4、零洪水位法零洪水位法也便是洪水位比擬法，它順應(yīng)于長短較短的電纜芯線對于地故障，使用此辦法測量煩瑣準(zhǔn)確，不需求精細(xì)儀器和簡單打算，其接線如圖5所示。測量道理如次：將電纜故障芯線與等長的比擬導(dǎo)線并聯(lián)，在兩頭加壓E時(shí)，相等于在兩個(gè)并聯(lián)的勻稱電阻絲兩頭接了電源。這時(shí)，一條電阻絲上的任何小半和另一條電阻絲上的對于應(yīng)點(diǎn)之間蓄電池組測量儀的洪水位差必定為零。反之，洪水位差為零的零點(diǎn)必定是對于應(yīng)點(diǎn)，由于微伏表的陰極接地，與電纜故障點(diǎn)等洪水位，因?yàn)?，?dāng)微伏表的陽極在比擬導(dǎo)熱上挪動(dòng)至示值為零時(shí)的點(diǎn)與故障點(diǎn)等洪水位，即故障點(diǎn)的對于應(yīng)點(diǎn)。圖5中K為單相電閘開關(guān)，E為6V蓄電池組或者4節(jié)1號(hào)干電池組，G為直流微伏表，</span></p><p><span style="font-family: 宋體; font-size: 16px;">測量方法如次：</span></p><p><span style="font-family: 宋體; font-size: 16px;">（1）先在b和c相芯線上接上電池組E，再在天空上敷設(shè)一根與故障電纜長短相同的比擬導(dǎo)線S，該導(dǎo)線要用裸銅絲或者裸鋁線，其截面應(yīng)相同，使不得有兩頭討論。</span></p><p><span style="font-family: 宋體; font-size: 16px;">（2）將微伏表的陰極接地，陽極接一根較長的軟導(dǎo)線，導(dǎo)線另一端請求在敷設(shè)的比擬導(dǎo)線上滑行時(shí)能充足接觸。</span></p><p><span style="font-family: 宋體; font-size: 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