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#f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>上海電流互感器歡迎來電,電流互感器</p><p><span>***更新：</span>2020-11-18 06:04:30</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="l77pqdf" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海喆和機電科技有限公司</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: </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="3d28ar3" class="page-proshow02"><p class="title">詳細說明</p><div id="qjl2wya" class="box"><p><p> 上海喆和供應西門子電流互感器。 </p> <p> <br /> </p> <p> 被測互感器與標準互感器的二次電流差一般采用互感器校驗儀進行量。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準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，基本由標準互感器決定。 </p> <p> 標準互感器是互感器校驗系統(tǒng)的關(guān)鍵**。對被測互感器進行校驗，除了標準互感器、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，及負載。折疊編輯本段運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；鐵芯嚴重發(fā)熱，燒壞電流互感器?！边@也是電力界公認的法規(guī)。 </p> <p> 我們科技服務小組在檢修學校配電盤的一只無示數(shù)電流表時發(fā)現(xiàn)，與其相串聯(lián)電流互感器二次開路運行，實測電壓為2.6V，恢復其原閉路接法，上海電流互感器歡迎來電，同時在主回路串入型號、變化相同的電流互感器，二次開路長期運行，上海電流互感器歡迎來電，并不發(fā)熱。這說明：目前實際應用的電流互感器運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，上海電流互感器歡迎來電。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.上海電流互感器歡迎來電</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海電流互感器歡迎來電,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087691485417/6371670876914854172826101.png"></div><p style="text-indent:25px">對于保護用電流互感器的裝設(shè)地點應按盡量消除主保護裝置的不保護區(qū)來設(shè)置。例如：若有兩組電流互感器，且位置允許時，應設(shè)在斷路器兩側(cè)，使斷路器處于交叉保護范圍之中6）為了防止支柱式電流互感器套管閃絡造成母線故障，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布置在發(fā)電機定子繞組的出線側(cè)。為了便于分析和在發(fā)電機并入系統(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)電機中性點側(cè)。接線方式電流互感器的接線方式按其所接負載的運行要求確定。**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，副邊電流應按比例變化，而且原、副邊電壓（或電流）應該同相位。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KNI2>I1時，比差為正，反之為負。上海電流互感器歡迎來電上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 130*50II電流互感器.</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海電流互感器歡迎來電,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087771928659/6371670877719286596119342.png"></div><p> 兩者的使用發(fā)展方向由于電磁式電流互感器存在的易飽和、非線性及頻帶窄等問題，電子式電流互感器逐漸興起。電子式電流互感器一般具有抗磁飽和、低功耗、寬頻帶等優(yōu)點。國內(nèi)具有代表性的電子式互感器有AnyWay變頻電壓傳感器、AnyWay變頻電流傳感器和變頻功率傳感器，其中，AnyWay變頻功率傳感器屬于電壓、電流組合式互感器。該互感器的主要特點如下1、采用前端數(shù)字化技術(shù)，光纖傳輸，電磁兼容性好。2、幅頻特性和相頻特性好，在寬幅值、頻率、相位范圍內(nèi)均可獲得較高的測量精度。3、屬于數(shù)字式傳感器，二次儀表不會引入誤差，傳感器誤差就是系統(tǒng)誤差。 </p> <p> 額定電壓電流互感器額定電壓應大于裝設(shè)點線路額定電壓 [7] 。變比應根據(jù)一次負荷計算電流IC選擇電流互感器變比。電流互感器一次側(cè)額定電流標準比（如20、30、40、50、75、100、150、2×a/C）等多種規(guī)格，二次側(cè)額定電流通常為1A或5A。其中2×a/C表示同一臺產(chǎn)品有兩種電流比，通過改變產(chǎn)品的連接片接線方式實現(xiàn)，當串聯(lián)時，電流比為a/c，并聯(lián)時電流比為2×a/C。一般情況下，計量用電流互感器變流比的選擇應使其一次額定電流I1n不小于線路中的負荷電流（即計算IC）。如線路中負荷計算電流為350A，則電流互感器的變流比應選擇400/5 </p><p> 上海喆和銷售西門子電流互感器ALH-0.66系列 </p> <p> 測量用電流互感器的精度等級±1%，另外還有。保護用電流互感器的精度等級5P/10P，10P標示復合誤差不超過10%。折疊保護用電流互感器保護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，向繼電裝置提供信號切斷故障電路，以保護供電系統(tǒng)的安全。保護用微型電流互感器的工作條件與測量用互感器完全不同，保護用互感器只是在比正常電流大幾倍幾十倍的電流時才開始有效的工作。保護用互感器主要要求：1.絕緣可靠，2.足夠大的準確限值系數(shù)，3.足夠的熱穩(wěn)定性和動穩(wěn)定性。保護用互感器在額定負荷下能夠滿足準確級的要求比較大一次電流叫額定準確限值一次電流。準確限值系數(shù)就是額定準確限值一次電流與額定一次電流比。當一次電流足夠大時鐵芯就會飽和起不到反映一次電流的作用，準確限值系數(shù)就是表示這種特性。保護用互感器準確等級5P、10P，表示在額定準確限值一次電流時的允許誤差5%、10%線路發(fā)生故障時的沖擊電流產(chǎn)生熱和電磁力，保護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，稱額定短時熱電流。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="上海電流互感器歡迎來電,電流互感器" src="http://tyunfile.71360.com/UpLoadFile/shcmzdh/2020/2/637167087973056246/6371670879730562466968566.png"></div><p> 對于沒有采取補償措施的電流互感器，比差為負值，角差為正值，比差的***值和角差均隨電流增大而減小。采用補償?shù)霓k法可以減小互感器的誤差。一般通過在互感器上加繞附加繞組或增添附加鐵心，以及接入相應的電阻、電感、電容元件來補償。常用的補償法有匝數(shù)補償、分數(shù)匝補償、小鐵心補償、并聯(lián)電容補償?shù)取Ｐｒ灧椒ㄔ谶M行電流互感器誤差試驗之前，通常需要檢查極性和退磁等試驗。極性檢查電流互感器一次繞組標志為P1、P2，二次繞組標志為S1、S2。若P1、S1是同名端，則這種標志叫減極性。一次電流從P1進，二次電流從S1出。極性檢查很簡單，除了可以在互感器校驗儀上進行檢查外，還可以使用直流檢查法。退磁檢查電流互感器在電流突然下降的情況下，互感器鐵芯可能產(chǎn)生剩磁。如電流互感器在大電流情況下突然切斷電源、二次繞組突然開路等。互感器鐵芯有剩磁，使鐵芯磁導率下降，影響互感器性能。長期使用后的互感器都應該退磁?；ジ衅鳈z驗前也要退磁。退磁就是通過一次或二次繞組以交變的勵磁電流，給鐵芯以交變的磁場。從0開始逐漸加大交變的磁場(勵磁電流)使鐵芯達到飽和狀態(tài)，然后再慢慢減小勵磁電流到零，以消除剩磁。上海喆和定制銷售西門子APT（原上海二工）ALH-0.66 180II電流互感器.上海電流互感器歡迎來電</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電流互感器.上海電流互感器歡迎來電</p><p> 電氣調(diào)試是電力工作中一項重要的內(nèi)容，在電氣調(diào)試工作中，二次回路檢查又是一項重要的調(diào)試內(nèi)容，它是關(guān)系到電力系統(tǒng)的測量、保護、通訊等功能能否發(fā)揮作用的前提。在二次回路中，電流互感器的接線是否正確又是電流二次回路是否正確的基礎(chǔ)，所以電流互感器的接線正確性非常重要。很多電氣調(diào)試人員對它沒有深刻的理解，經(jīng)常搞錯，造成諸如差動保護誤動作、電度表反轉(zhuǎn)等。下面對這個問題做一個***、細致的論述。電氣調(diào)試是電力工作中一項重要的內(nèi)容，在電氣調(diào)試工作中，二次回路檢查又是一項重要的調(diào)試內(nèi)容，它是關(guān)系到電力系統(tǒng)的測量、保護、通訊等功能能否發(fā)揮作用的前提。在二次回路中，電流互感器的接線是否正確又是電流二次回路是否正確的基礎(chǔ)，所以電流互感器的接線正確性非常重要。很多電氣調(diào)試人員對它沒有深刻的理解，經(jīng)常搞錯，造成諸如差動保護誤動作、電度表反轉(zhuǎn)等。下面對這個問題做一個***、細致的論述。電流互感器的結(jié)構(gòu)較為簡單，由相互絕緣的一次繞組、二次繞組、鐵心以及構(gòu)架、殼體、接線端子等組成。其工作原理與變壓器基本相同，一次繞組的匝數(shù)(N1)較少，直接串聯(lián)于電源線路中，一次負荷電流。上海電流互感器歡迎來電</p><p style="text-indent:25px">上海喆和機電科技有限公司致力于電工電氣，以科技創(chuàng)新實現(xiàn)***管理的追求。公司自創(chuàng)立以來，投身于編程控制器，光電傳感器，變頻器，軟啟動器，是電工電氣的主力軍。上海喆和機電科始終以本分踏實的精神和必勝的信念，影響并帶動團隊取得成功。上海喆和機電科創(chuàng)始人李小雅，始終關(guān)注客戶，創(chuàng)新科技，竭誠為客戶提供良好的服務。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2038580.html</p></div></div></div></div></div><div id="237acov" 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