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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>上海實(shí)力特賣電流互感器貨期短,電流互感器</p><p><span>***更新：</span>2020-09-27 09:05:18</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="foldaht" 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(hào)</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="d2mo8d8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="mfrjgnk" class="box"><p><p> 電流互感器ε%誤差曲線校驗(yàn)步驟：⑴按照保護(hù)裝置類型計(jì)算流過電流互感器的一次電流倍數(shù)⑵根據(jù)電流互感器的型號(hào)、變比和一次電流倍數(shù)，在10%誤差曲線上確定電流互感器的允許二次負(fù)荷⑶按照對(duì)電流互感器二次負(fù)荷**嚴(yán)重的短路類型，計(jì)算電流互感器的實(shí)際二次負(fù)荷⑷比較實(shí)際二次負(fù)荷與允許二次負(fù)荷。如實(shí)際二次負(fù)荷小于允許二次負(fù)荷，表示電流互感器的誤差不超過10%誤差：1）增大連接導(dǎo)線截面或縮短連接導(dǎo)線長(zhǎng)度，以減小實(shí)際二次負(fù)荷2）選擇比較大的電流互感器，減小一次電流倍數(shù)，增大允許二次負(fù)荷3）將電流互感器的二次繞組串聯(lián)起來，使允許二次負(fù)荷增大一倍。動(dòng)、熱穩(wěn)定度需校驗(yàn)電流互感器的動(dòng)穩(wěn)定度和熱穩(wěn)定度[9]，廠家的產(chǎn)品技術(shù)參數(shù)中都給出了動(dòng)穩(wěn)定倍數(shù)Kes和熱穩(wěn)定倍數(shù)Kt，因此按下列公式分別校驗(yàn)動(dòng)穩(wěn)定和熱定度即可。1）動(dòng)穩(wěn)定度校驗(yàn)Kes×I1N≥2）熱穩(wěn)定度校驗(yàn)（KtI1n)2t≥I⑶∞tima式中，t為熱穩(wěn)定電流時(shí)間。額定容量電流互感器二次額定容量要大于實(shí)際二次負(fù)載，實(shí)際二次負(fù)載應(yīng)為25～**二次額定容量。容量決定二次側(cè)負(fù)載阻抗，上海實(shí)力特賣電流互感器貨期短，負(fù)載阻抗又影響測(cè)量或控制精度。負(fù)載阻抗主要受測(cè)量?jī)x表和繼電器線圈電阻，上海實(shí)力特賣電流互感器貨期短、電抗及接線接觸電阻、二次連接導(dǎo)線電阻的影響，上海實(shí)力特賣電流互感器貨期短。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 120III-P電流互感器.上海實(shí)力特賣電流互感器貨期短</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海實(shí)力特賣電流互感器貨期短,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167088041488527/6371670880414885276367966.png"></div><p> 電流互感器的常見問題往往與制造缺點(diǎn)有關(guān)，具體如下：電流互感器的絕緣很厚，有的絕緣包繞松散，絕緣層間有皺折，加之真空處理不良，浸漬不完全而造成含氣空腔，從而易引起局部放電故障[12]電容屏尺寸與排列不符合設(shè)計(jì)要求，電流互感器故障原因統(tǒng)計(jì)[13]甚至少放電容屏，電容極板不光滑平整，甚至錯(cuò)位或斷裂，使其均壓特性破壞。因此，當(dāng)局部固體絕緣沿面的電場(chǎng)強(qiáng)度達(dá)到一定數(shù)值時(shí)，就會(huì)造成局部放電。上述局部放電的直接后果是使絕緣油裂解，在絕緣層間生成大量的x臘，介損增大。這種放電是有累積效應(yīng)的，任其發(fā)展下去，油中氣體分析將可能出現(xiàn)電弧放電的特征。由于絕緣材料不清潔或含濕高，可能在其表面產(chǎn)生沿面放電。這種情況多見于一次端子引線沿墊塊表面放電某些連接松動(dòng)或金屬件電位懸浮將導(dǎo)致火花放電，例如一次繞組支持螺母松動(dòng)，造成一次繞組屏蔽鋁箔電位懸浮，末屏引線接觸或焊接不良甚至斷線，均會(huì)引起此類故障。次連接夾板、螺栓、螺母松動(dòng)，末屏接地螺母松動(dòng)，抽頭緊固螺母松動(dòng)等，均可能使接觸電阻增大，從而導(dǎo)致局部過熱故障。此外，現(xiàn)場(chǎng)維護(hù)管理不當(dāng)也應(yīng)引起重視。例如，互感器進(jìn)水受潮，雖然可能與制造廠的密封結(jié)構(gòu)和密封材料有關(guān)，但是。上海二工電流互感器ALH-0.66 100III上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 40II電流互感器.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海實(shí)力特賣電流互感器貨期短,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087771928659/6371670877719286596119342.png"></div><p style="text-indent:25px"> 上海喆和供應(yīng)西門子APT電流互感器在變流實(shí)驗(yàn)臺(tái)上對(duì)每種電流互感器，一次測(cè)注入額定電流的0．1，0．2，…，1倍的電流。二次以開路和閉路兩種方式運(yùn)行，測(cè)得一次電壓和一次電流，可以求出一次測(cè)在二次開、閉路情況下的阻抗，其數(shù)值很小。例如一次阻抗額定的44號(hào)3015LQG系列電流互感器，當(dāng)一次測(cè)加30A電流，二次開路，一次電壓為3V，則一次阻抗為0．1Ω。在二次閉路條件下，一次電壓為0．5V，一次阻抗為O．017Ω,。其余電流互感器隨變化的增大。一次阻抗變得很小，其中以母線穿心式的電流互感器**小。同理利用二次伏安特性，可以直接求出除母線穿心式電流互感器以外的其他各類電流互感器在一次開路或閉路情況下的二次阻抗。對(duì)母線穿心式電流互感器一次開路情況下，二次阻抗可以直接利用二次伏安法求出。一次閉路情況下的二次阻抗必須加穿心短路環(huán)，所用短路環(huán)是多股細(xì)銅線組成的150mm2以上的單匝或多匝短路環(huán)，在滿足二次輸入安匝近似等于—?次安匝情況下，可求出母線穿心式電流互感器一次閉路情況下的二次阻抗。例如5號(hào)電流互感器，二次注入1～5A電流，一次加150mm2短路環(huán)后，其二次阻抗都是0．19Ω，近似等于銘牌標(biāo)定的負(fù)荷0．2Ω或5VA。</p><p style="text-indent:25px">對(duì)于保護(hù)用電流互感器的裝設(shè)地點(diǎn)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(shí)，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(shí)的損傷，用于自動(dòng)調(diào)節(jié)勵(lì)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(cè)量?jī)x表的電流互感器宜裝在發(fā)電機(jī)中性點(diǎn)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(dòng)時(shí)，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(lì)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(duì)后者之比，即fI 為電流互感器的比差。當(dāng)KNI2>I1時(shí)，比差為正，反之為負(fù)。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 220*50II電流互感器.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海實(shí)力特賣電流互感器貨期短,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087534940225/6371670875349402255061651.png"></div><p> 上海喆和銷售西門子電流互感器ALH-0.66系列 </p> <p> 測(cè)量用電流互感器的精度等級(jí)±1%，另外還有。保護(hù)用電流互感器的精度等級(jí)5P/10P，10P標(biāo)示復(fù)合誤差不超過10%。折疊保護(hù)用電流互感器保護(hù)用電流互感器主要與繼電裝置配合，在線路發(fā)生短路過載等故障時(shí)，向繼電裝置提供信號(hào)切斷故障電路，以保護(hù)供電系統(tǒng)的安全。保護(hù)用微型電流互感器的工作條件與測(cè)量用互感器完全不同，保護(hù)用互感器只是在比正常電流大幾倍幾十倍的電流時(shí)才開始有效的工作。保護(hù)用互感器主要要求：1.絕緣可靠，2.足夠大的準(zhǔn)確限值系數(shù)，3.足夠的熱穩(wěn)定性和動(dòng)穩(wěn)定性。保護(hù)用互感器在額定負(fù)荷下能夠滿足準(zhǔn)確級(jí)的要求比較大一次電流叫額定準(zhǔn)確限值一次電流。準(zhǔn)確限值系數(shù)就是額定準(zhǔn)確限值一次電流與額定一次電流比。當(dāng)一次電流足夠大時(shí)鐵芯就會(huì)飽和起不到反映一次電流的作用，準(zhǔn)確限值系數(shù)就是表示這種特性。保護(hù)用互感器準(zhǔn)確等級(jí)5P、10P，表示在額定準(zhǔn)確限值一次電流時(shí)的允許誤差5%、10%線路發(fā)生故障時(shí)的沖擊電流產(chǎn)生熱和電磁力，保護(hù)用電流互感器必須承受。二次繞組短路情況下，電流互感器在一秒內(nèi)能承受而無損傷的一次電流有效值，稱額定短時(shí)熱電流。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 60*50II-P電流互感器.上?，F(xiàn)貨銷售電流互感器便宜</p><p style="text-indent:25px">上海喆和定制銷售西門子APT電流互感器ALH-0.66.上海實(shí)力特賣電流互感器貨期短</p><p> 上海喆和供應(yīng)西門子電流互感器。 </p> <p> <br /> </p> <p> 被測(cè)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(yàn)儀進(jìn)行量。直接從互感器校驗(yàn)儀上讀出比值差fx(%)，相位差δx(’)。由于互感器校驗(yàn)儀測(cè)的是被測(cè)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(duì)互感器校驗(yàn)儀的要求不高。要能校驗(yàn)什么等級(jí)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(yàn)系統(tǒng)的關(guān)鍵**。對(duì)被測(cè)互感器進(jìn)行校驗(yàn)，除了標(biāo)準(zhǔn)互感器、互感器校驗(yàn)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(cè)及各類教材中，對(duì)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。”這也是電力界公認(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(shí)發(fā)現(xiàn)，與其相串聯(lián)電流互感器二次開路運(yùn)行，實(shí)測(cè)電壓為2.6V，恢復(fù)其原閉路接法，同時(shí)在主回路串入型號(hào)、變化相同的電流互感器，二次開路長(zhǎng)期運(yùn)行，并不發(fā)熱。這說明：目前實(shí)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。上海實(shí)力特賣電流互感器貨期短</p><p style="text-indent:25px">上海喆和機(jī)電科技有限公司是一家從事機(jī)電科技領(lǐng)域內(nèi)的技術(shù)開發(fā)、技術(shù)咨詢、技術(shù)服務(wù)、技術(shù)轉(zhuǎn)讓,機(jī)電設(shè)備、五金交電、儀器儀表、電子產(chǎn)品、電子元器件、通訊設(shè)備(除衛(wèi)星電視廣播地面接收設(shè)施)、五金工具、橡塑制品、陶瓷制品、金屬材料、五金制品、包裝材料、建筑裝潢材料、化工原料及產(chǎn)品(除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、民用物品、易制毒化學(xué)品)、管道及配件、閥門的批發(fā)、零售?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目,經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營(yíng)活動(dòng)】的公司，致力于發(fā)展為創(chuàng)新務(wù)實(shí)、誠(chéng)實(shí)可信的企業(yè)。上海喆和機(jī)電科深耕行業(yè)多年，始終以客戶的需求為向?qū)?，為客戶提?**的編程控制器，光電傳感器，變頻器，軟啟動(dòng)器。上海喆和機(jī)電科繼續(xù)堅(jiān)定不移地走高質(zhì)量發(fā)展道路，既要實(shí)現(xiàn)基本面穩(wěn)定增長(zhǎng)，又要聚焦關(guān)鍵領(lǐng)域，實(shí)現(xiàn)轉(zhuǎn)型再突破。上海喆和機(jī)電科始終關(guān)注電工電氣行業(yè)。滿足市場(chǎng)需求，提高產(chǎn)品價(jià)值，是我們前行的力量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1441453.html</p></div></div></div></div></div><div id="mg8qax2" class="page-right twoColRt"><div id="vuqn7km" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div 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