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<p><strong>10KV/35KV電力電纜耐壓試驗(yàn)的意義和方法</strong><br/></p><p><br/></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">變頻串聯(lián)諧振耐壓試驗(yàn)由于其*的優(yōu)勢(shì)得到了廣泛的應(yīng)用，由于現(xiàn)代社會(huì)以及城市的發(fā)展，對(duì)高壓電力電纜的需求不斷增長(zhǎng)，導(dǎo)致了我國(guó)電網(wǎng)改造工程增多。高壓電纜是電網(wǎng)改造以及大型供電樞紐中的主要應(yīng)用品種，其具有輸送容量大、電性能好、維護(hù)方便等優(yōu)勢(shì)。在現(xiàn)如今的供電企業(yè)中，變頻串聯(lián)諧振耐壓試驗(yàn)是未來(lái)電力電纜耐壓試驗(yàn)中的重要方式，由此可見(jiàn)變頻串聯(lián)諧振耐壓試驗(yàn)具有一定的現(xiàn)實(shí)意義。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">一、電力電纜耐壓試驗(yàn)的意義</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">電力電纜在使用過(guò)程中容易受到各種因素的影響，導(dǎo)致出現(xiàn)故障、短路等問(wèn)題，這些問(wèn)題都與絕緣部分缺損有一定的關(guān)系，其主要由下述幾方面引起的：</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">①滿負(fù)荷運(yùn)行。在一般情況下，電纜溫度上升8℃，絕緣壽命就會(huì)下降，若處于滿負(fù)荷運(yùn)行狀態(tài)，就會(huì)導(dǎo)致處于高溫狀態(tài)，導(dǎo)致絕緣使用壽命縮短。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">②外力沖擊。這主要是電纜鋪設(shè)過(guò)程中受到施工技術(shù)的影響。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">③受潮。由于雨水具有導(dǎo)電作用，會(huì)導(dǎo)致介質(zhì)損耗增多，進(jìn)而導(dǎo)致絕緣發(fā)熱，促使絕緣壽命縮短。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">④接觸不良。這主要是由于電纜制作工藝技術(shù)水平低，接頭沒(méi)有壓實(shí)、加熱不充分等導(dǎo)致的電纜接頭絕緣降低。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">⑤腐蝕作用。風(fēng)力侵蝕、雨水侵蝕以及地下電纜的酸堿腐蝕都會(huì)導(dǎo)致電纜絕緣降低。因此，檢測(cè)電力電纜有*或異常存在具有重要的現(xiàn)實(shí)意義。耐壓試驗(yàn)就是以尋找電纜存在的故障為目的的一種檢驗(yàn)方式。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">二、目前電力電纜耐壓試驗(yàn)的主要方法</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">1.超低頻耐壓試驗(yàn)</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">超低頻(0.1Hz)耐壓試驗(yàn)方法早出現(xiàn)于1980年，其主要是用于觀察電纜運(yùn)行是否存在絕緣缺損的一種無(wú)損試驗(yàn)方法，并且該方法經(jīng)過(guò)大量的研究室試驗(yàn)以及現(xiàn)場(chǎng)試驗(yàn)，中試控股證實(shí)超低頻耐壓試驗(yàn)在中低壓電力電纜耐壓試驗(yàn)中有較好的應(yīng)用效果。該方法利用的原理是將50Hz交流電通過(guò)整流與濾波轉(zhuǎn)變?yōu)橹绷麟妷海俳?jīng)由逆變電路，將直流電壓轉(zhuǎn)變?yōu)?kHz交流電壓，再通過(guò)0.1Hz正弦振蕩器完成調(diào)幅處理，當(dāng)經(jīng)過(guò)調(diào)幅后，1kHz交流電壓等幅波就會(huì)轉(zhuǎn)變?yōu)?.1Hz變化條幅波。其主要是基于高壓變壓器與電壓倍增電路之間形成的高電壓，其主要表現(xiàn)為正弦波，并經(jīng)由壓敏電阻器進(jìn)行調(diào)解，從而使高交流電壓負(fù)載輸出為0.1Hz高壓正弦波形。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">超低頻耐壓試驗(yàn)的優(yōu)勢(shì)主要在于：</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">①無(wú)損壞；</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">②準(zhǔn)確性高；</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">③設(shè)備體積小，易于攜帶。但是該方法的輸出電壓等級(jí)較低，主要還是在中低壓電纜耐壓試驗(yàn)中使用。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">2.調(diào)感式工頻串聯(lián)諧振試驗(yàn)</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">該方法主要是利用電抗器的感抗作用以及被測(cè)電纜電容的容抗在50Hz工頻環(huán)境中會(huì)產(chǎn)生諧振的工作原理，此過(guò)程中會(huì)產(chǎn)生高電壓。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">調(diào)感式工頻串聯(lián)諧振試驗(yàn)的優(yōu)勢(shì)在于：</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">①輸出電流波形基本為正弦波;</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">②特異性高，只有在串聯(lián)諧振回路滿足了產(chǎn)生諧振的條件后，才會(huì)形成高電壓，而被測(cè)電纜一旦出現(xiàn)問(wèn)題，就會(huì)造成回路異常，就相當(dāng)于電纜短路，高電壓也會(huì)出現(xiàn)一致性降落，又由于電抗器能夠限制短路電流，從而保護(hù)裝置不受影響，從而不需要加裝電阻保護(hù)裝置。該試驗(yàn)方式的劣勢(shì)在于操作復(fù)雜、系統(tǒng)品質(zhì)因數(shù)不高、自動(dòng)化水平低、噪音大，導(dǎo)致其在實(shí)際中的應(yīng)用受到限制。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">3.變頻串聯(lián)諧振試驗(yàn)</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">變頻串聯(lián)諧振試驗(yàn)原理與上述調(diào)感式工頻串聯(lián)諧振試驗(yàn)原理相似，不同之處在于：變頻串聯(lián)諧振試驗(yàn)是通過(guò)調(diào)節(jié)變頻電源中的輸出電壓頻率實(shí)現(xiàn)試驗(yàn)回路產(chǎn)生諧振;而調(diào)感式工頻串聯(lián)諧振試驗(yàn)則是通過(guò)基于50Hz工頻下的調(diào)節(jié)電抗器產(chǎn)生的電感量實(shí)現(xiàn)試驗(yàn)回路產(chǎn)生諧振。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">變頻串聯(lián)諧振試驗(yàn)的優(yōu)點(diǎn)為：</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">當(dāng)試驗(yàn)所需電源容量低于被測(cè)電纜的電源容量時(shí)，能夠在遠(yuǎn)低于所需電源功率的情況下進(jìn)行試驗(yàn)，能夠有效提高現(xiàn)場(chǎng)試驗(yàn)的效率，并且能夠克服調(diào)感式工頻耐壓試驗(yàn)裝置中的缺點(diǎn)，使其能夠在實(shí)際生活中得到更加廣泛的應(yīng)用。此外，變頻串聯(lián)諧振試驗(yàn)的工作頻率僅為30～300Hz，能夠完善超低頻耐壓試驗(yàn)的頻率過(guò)低、損耗小導(dǎo)致與實(shí)際損耗量不符的問(wèn)題。因此，中試控股變頻串聯(lián)諧振耐壓試驗(yàn)所得結(jié)果為精密、全面和可靠的。</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">三、變頻串聯(lián)諧振耐壓試驗(yàn)設(shè)計(jì)</span></span></p><p style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: verdana, geneva, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px;">變頻串聯(lián)諧振耐壓試驗(yàn)主要包括變頻電源主電路、勵(lì)磁變壓器、諧振電抗器、電容分壓器、補(bǔ)償電容器等設(shè)備。國(guó)際大電網(wǎng)會(huì)議組織建議以30～300Hz為試驗(yàn)頻率范圍，但是由于實(shí)際生活中存在一些影響因素，可以20～300Hz為試驗(yàn)頻率范圍。我國(guó)額定工頻為50Hz，在預(yù)防性試驗(yàn)的工頻范圍為45～55Hz，這樣做的目的為了滿足對(duì)被測(cè)電纜絕緣下降進(jìn)行實(shí)時(shí)監(jiān)測(cè)的需求，因此才選擇比額定工頻范圍更大的頻率。實(shí)際試驗(yàn)中的接近工頻頻率為35～75Hz，這主要是在大量的試驗(yàn)與研究中發(fā)現(xiàn)工頻頻率在35～75Hz時(shí)，擊穿電壓可信度為95%，因此，中試控股在變頻串聯(lián)諧振耐壓試驗(yàn)中將接近工頻選擇35～75Hz為狀</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img79.chem17.com/2/20210801/637633997314627033556.jpg" title="5C67DE50AAD821EBA936B299A7FDCA8C.jpg" alt="5C67DE50AAD821EBA936B299A7FDCA8C.jpg"/></p><p><strong><br/></strong><br/></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-2730849.html">如何判斷電纜是否帶電，以及如何檢測(cè)電纜故障?</a></p> <p>下一篇：<a href="/Article-2730846.html">SB2231型直流電阻測(cè)試儀技術(shù)參數(shù)</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div id="iqaqewgi6e" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> <ul> <li><a href="/ParentList-1388067.html" onmouseover="showsubmenu('大電流發(fā)生器')" class="yj">大電流發(fā)生器</a> <div class="iqaqewgi6e" id="submenu_大電流發(fā)生器" style="display:none"> <ul> </ul> </div> </li> <li><a href="/ParentList-1384344.html" onmouseover="showsubmenu('LCR數(shù)字電橋')" class="yj">LCR數(shù)字電橋</a> <div class="iqaqewgi6e" 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