上海廠家授權(quán)銷售電流互感器歡迎咨詢上海喆和機(jī)電科技供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="上海喆和供應(yīng)西門子電流互感器。被測互感器與標(biāo)準(zhǔn)互感器的二次電流差一般采用互感器校驗儀進(jìn)行量。直接從互感器校驗儀上讀出比值差fx(%)，相位差δx(’)。由于互感器校驗儀測的是被測互感器與標(biāo)準(zhǔn)互感器電流差與二次電流的比值，所以對互感器校驗儀的"><meta name="keywords" content="上海廠家授權(quán)銷售電流互感器,電流互感器"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" 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src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167088129589451/6371670881295894516977483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="g8pwdfr" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167088129589451/6371670881295894516977483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="dtcfzjk" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>上海廠家授權(quán)銷售電流互感器,電流互感器</p><p><span>***更新：</span>2020-11-02 03:04:13</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="osz83r3" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海喆和機(jī)電科技有限公司</a></p><p><span>聯(lián)系人：</span>李小雅</p><p><span>郵箱: </span>shzh-sh@qq.com</p><p><span>電話: </span>13761188658</p><p><span>傳真: </span>021_53862782</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>021-53862782</p><p><span>地址: </span>上海市靜安區(qū)恒豐北路100號</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="udvmtvm" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="3xff3az" class="box"><p><p> 上海喆和供應(yīng)西門子電流互感器。 </p> <p> <br /> </p> <p> 被測互感器與標(biāo)準(zhǔn)互感器的二次電流差一般采用互感器校驗儀進(jìn)行量。直接從互感器校驗儀上讀出比值差fx(%)，相位差δx(’)。由于互感器校驗儀測的是被測互感器與標(biāo)準(zhǔn)互感器電流差與二次電流的比值，所以對互感器校驗儀的要求不高。要能校驗什么等級的互感器，基本由標(biāo)準(zhǔn)互感器決定。 </p> <p> 標(biāo)準(zhǔn)互感器是互感器校驗系統(tǒng)的關(guān)鍵**。對被測互感器進(jìn)行校驗，除了標(biāo)準(zhǔn)互感器、互感器校驗儀還要有給互感器提供一次電流的升流器，可以調(diào)節(jié)升流器電流的調(diào)壓器，及負(fù)載。折疊編輯本段運(yùn)行特性在電工手冊及各類教材中，對電流互感器二次開路運(yùn)行的結(jié)論是：“電流互感器二次開路產(chǎn)生幾百伏、lkV～10kV的危及人身安全的高壓；鐵芯嚴(yán)重發(fā)熱，燒壞電流互感器?！边@也是電力界公認(rèn)的法規(guī)。 </p> <p> 我們科技服務(wù)小組在檢修學(xué)校配電盤的一只無示數(shù)電流表時發(fā)現(xiàn)，上海廠家授權(quán)銷售電流互感器，與其相串聯(lián)電流互感器二次開路運(yùn)行，上海廠家授權(quán)銷售電流互感器，實測電壓為2.6V，恢復(fù)其原閉路接法，同時在主回路串入型號、變化相同的電流互感器，二次開路長期運(yùn)行，并不發(fā)熱，上海廠家授權(quán)銷售電流互感器。這說明：目前實際應(yīng)用的電流互感器運(yùn)行特性與一百多年來傳統(tǒng)的結(jié)論相比，有著不容忽視的重大差別。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 80*60II-P電流互感器.上海廠家授權(quán)銷售電流互感器</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海廠家授權(quán)銷售電流互感器,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167088129589451/6371670881295894516977483.png"></div><p style="text-indent:25px">對于保護(hù)用電流互感器的裝設(shè)地點應(yīng)按盡量消除主保護(hù)裝置的不保護(hù)區(qū)來設(shè)置。例如：若有兩組電流互感器，且位置允許時，應(yīng)設(shè)在斷路器兩側(cè)，使斷路器處于交叉保護(hù)范圍之中6）為了防止支柱式電流互感器套管閃絡(luò)造成母線故障，電流互感器通常布置在斷路器的出線或變壓器側(cè)7）為了減輕發(fā)電機(jī)內(nèi)部故障時的損傷，用于自動調(diào)節(jié)勵磁裝置的電流互感器應(yīng)布置在發(fā)電機(jī)定子繞組的出線側(cè)。為了便于分析和在發(fā)電機(jī)并入系統(tǒng)前發(fā)現(xiàn)內(nèi)部故障，用于測量儀表的電流互感器宜裝在發(fā)電機(jī)中性點側(cè)。接線方式電流互感器的接線方式按其所接負(fù)載的運(yùn)行要求確定。**常用的接線方式為單相、三相星形和不完全星形三種，分別如圖4a、圖4b和圖4c。電流互感器接線方式額定變比和誤差：電流互感器的額定變比KN指電流互感器的額定電流比。即：KN=I1N/I2N電流互感器原邊電流在一定范圍內(nèi)變動時，一般規(guī)定為10～120%I1N，副邊電流應(yīng)按比例變化，而且原、副邊電壓（或電流）應(yīng)該同相位。但由于互感器存在內(nèi)阻抗、勵磁電流和損耗等因素而使比值及相位出現(xiàn)誤差，分別稱為比差和角差。比差為經(jīng)折算后的二次電流與一次電流量值大小之差對后者之比，即fI 為電流互感器的比差。當(dāng)KNI2>I1時，比差為正，反之為負(fù)。上海定制電流互感器源頭直供上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 60III電流互感器.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海廠家授權(quán)銷售電流互感器,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087771928659/6371670877719286596119342.png"></div><p> 上海喆和定制銷售西門子電流互感器。主要技術(shù)要求額定容量：額定二次電流通過二次額定負(fù)荷時所消耗的視在功率。額定容量可以用視在功率，也可以用二次額定負(fù)荷阻抗Ω表示。一次額定電流：允許通過電流互感器一次繞組的用電負(fù)荷電流。用于電力系統(tǒng)的電流互感器一次額定電流為5～25000A，用于試驗設(shè)備的精密電流互感器為～50000A。電流互感器可在一次額定電流下長期運(yùn)行，負(fù)荷電流超過額定電流值時叫做過負(fù)荷，電流互感器長期過負(fù)荷運(yùn)行，會燒壞繞組或減少使用壽命。二次額定電流：允許通過電流互感器二次繞組的一次感應(yīng)電流。額定電流比（變比）：一次額定電流與二次額定電流之比。額定電壓：一次繞組長期對地能夠承受的額定電壓（有效值以kV為單位），應(yīng)不低于所接線路的額定相電壓。電流互感器的額定電壓分為，3，6，10，35，110，220，330，500kV等幾種電壓等級。10%倍數(shù)：在指定的二次負(fù)荷和任意功率因數(shù)下，電流互感器的電流誤差為－10%時，一次電流對其額定值的倍數(shù)。10%倍數(shù)是與繼電保護(hù)有關(guān)的技術(shù)指標(biāo)。準(zhǔn)確度等級：表示互感器本身誤差（比差和角差）的等級。電流互感器的準(zhǔn)確度等級分為～1多種級別，與原來相比準(zhǔn)確度提高很大。 </p><p style="text-indent:25px"> 上海喆和銷售電流互感器。對于電流互感器退磁，一次繞組開路，二次繞組通以工頻電流，從零開始逐漸增加到一定的電流值(該電流值與互感器的設(shè)計測量上限有關(guān)，一般為額定電流的20-50%左右。可以這樣判斷，如果電流突然急劇變大，此時表示鐵芯以進(jìn)入磁飽和階段)。然后再將電流緩慢降為零，如此重復(fù)2-3次。在斷開電源前，應(yīng)將一次繞組短接，才斷開電源。鐵芯退磁完成。此方法稱開路退磁法。對于有些電流互感器，由于二次繞組的匝數(shù)都比較多。若采用開路退磁法，開路的繞組可能產(chǎn)生高電壓。因此可以在二次繞組接上較大的電阻(額定阻抗的10-20倍)。一次繞組通以電流，從零漸變到互感器一次繞組的允許的額定電流，再漸變到零，如此重復(fù)2-3次。由于接有負(fù)載鐵芯可能不能完全退磁。由于一次繞組的額定電流有限制，過大的話可能燒壞一次繞組。如果接有負(fù)載的二次繞組產(chǎn)生電壓不是過高的話，可以加大二次繞組的負(fù)載電阻。這樣可以提高退磁效果。3、電流互感器誤差試驗互感器誤差試驗一般采用被測互感器與標(biāo)準(zhǔn)互感器進(jìn)行比較，兩互感器的二次電流差即為被測互感器誤差。此種檢驗方法稱比較法。標(biāo)準(zhǔn)互感器要求比被測互感器高出二個等級，此時標(biāo)準(zhǔn)互感器誤差可忽略不計。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 M8-I電流互感器.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海廠家授權(quán)銷售電流互感器,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087835529280/6371670878355292804681260.png"></div><p> 上海喆和定制西門子電流互感器 ALH-0.66系列。 </p> <p> 準(zhǔn)確級選擇的原則：計費(fèi)計量用的電流互感器其準(zhǔn)確級不低于0．5級；用于監(jiān)視各進(jìn)出線回路中負(fù)荷電流大小的電流表應(yīng)選用1．0—3．0級電流互感器。為了保證準(zhǔn)確度誤差不超過規(guī)定值，一般還校驗電流互感器二次負(fù)荷（伏安），互感器二次負(fù)荷S2不大于額定負(fù)荷S2n，所選準(zhǔn)確度才能得到保證。準(zhǔn)確度校驗公式：S2≤S2n。二次回路的負(fù)荷l：取決于二次回路的阻抗Z2的值，則：S2=I2n2︱Z2︱≈I2n2（∑︱Zi︱+ RWl+RXC）或S2V1≈∑Si+I2n2（RWl+RXC）式中，Si、Zi為二次回路中的儀表、繼電器線圈的額定負(fù)荷和阻抗，RXC為二次回路中所有接頭、觸點的接觸電阻，一般取0．1Ω，RWL為二次回路導(dǎo)線電阻，計算公式化為：RWL=LC/（r×S）。式中，r為導(dǎo)線的導(dǎo)電率，銅線r=53m/（Ωmm2），鋁線r=32m（Ωmm2），S為導(dǎo)線截面積（mm2），LC為導(dǎo)線的計算長度（m）。設(shè)互感器到儀表單向長度為L1，則：L1互感器為星形接LC=L1兩相V形接線2L1一相式接線繼電保護(hù)用的電流互感器的準(zhǔn)確度常用的有5P和l0P。保護(hù)級的準(zhǔn)確度是以額定準(zhǔn)確限值一次電流下的電流互感器額定復(fù)合誤差ε%來標(biāo)稱的（如5P對應(yīng)的ε%=5%）。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 D15-I電流互感器.上海廠家授權(quán)銷售電流互感器</p><p style="text-indent:25px">上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 80II-P電流互感器.上海廠家授權(quán)銷售電流互感器</p><p> 上海喆和供應(yīng)西門子APT電流互感器ALH-0.66系列。上海喆和在對電流互感器進(jìn)行檢修時發(fā)現(xiàn)，即使互感器的二次線圈開路運(yùn)行，也不會造成設(shè)備損害。這一現(xiàn)象與傳統(tǒng)的電工手冊及各類教材所提出的電流互感器二次開路產(chǎn)生幾百伏以上、危及人身安全的高壓，鐵芯嚴(yán)重發(fā)熱，燒壞電流互感器并不一致。為了解決這一問題，弄清電流互感器的運(yùn)行參數(shù)，作者進(jìn)行了一系列的實驗，在進(jìn)行了大量調(diào)查實驗基礎(chǔ)上，得出了令人信服的結(jié)論。 </p> <p> 上海喆和發(fā)現(xiàn)，目前生產(chǎn)和應(yīng)用的電流互感器的發(fā)熱特性與傳統(tǒng)結(jié)論截然不同：其二次開路狀態(tài)工作時，一般不會過熱；只有極少數(shù)型號功耗增大，發(fā)熱嚴(yán)重，但在正常工作電流下，也不會燒壞設(shè)備。至于二次開路電壓，則始終在低壓范圍內(nèi)波動。上海喆和在對數(shù)十種型號的電流互感器進(jìn)行實驗測定的基礎(chǔ)上，得出結(jié)論，二次開路時具有恒壓源和恒流源兩種電路的特性，可以穩(wěn)定、可靠地用作自動控制功率型信號源。這種突破傳統(tǒng)的電路運(yùn)用方式，可廣泛應(yīng)用于自動化控制設(shè)計，產(chǎn)生良好的經(jīng)濟(jì)效益和社會效益。 </p> <p> 從實際出發(fā)，不迷信傳統(tǒng)觀念，利用科學(xué)手段突破舊有框框，大膽創(chuàng)新，才能在科技事業(yè)中取得成績。上海廠家授權(quán)銷售電流互感器</p><p 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