A-B 1785-BCM

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描述

A-B 1785-BCM

在10kV中性點(diǎn)不接地系統(tǒng)中,為了監(jiān)視系統(tǒng)中各相對地的絕緣狀況以及計(jì)量和保護(hù)的需要,在每個(gè)變電站的母線上均裝有電磁式電壓互感器。當(dāng)系統(tǒng)發(fā)生單相接地故障時(shí),將產(chǎn)生較高的諧振過電壓,影響系統(tǒng)設(shè)備的絕緣性能和使用壽命,進(jìn)而出現(xiàn)更頻繁的故障。

在中性點(diǎn)不接地系統(tǒng)中,當(dāng)其中一相出現(xiàn)金屬性接地時(shí),就會(huì)產(chǎn)生激磁涌流,導(dǎo)致電壓互感器鐵芯飽和。如A相接地,則Uan的電壓為零,非接地相Ubn、Ucn的電壓表指示為100V線電壓。電壓互感器開口三角兩端出現(xiàn)約100V電壓(正常時(shí)只有約3V),這個(gè)電壓將起動(dòng)絕緣檢查繼電器發(fā)出接地信號(hào)并報(bào)警。當(dāng)發(fā)生非金屬性短路接地時(shí),即高電阻、電弧、樹竹等單相接地。如A相發(fā)生接地,則Uan的電壓低于正常相電壓,Ubn、Ucn電壓則大于58V,且小于100V,電壓互感器開口三角處兩端有約70V電壓,達(dá)到絕緣檢查繼電器起動(dòng)值,發(fā)出接地信號(hào)并報(bào)警。電壓互感器二次側(cè)熔斷器熔斷或接觸不良時(shí),中央信號(hào)屏發(fā)出“電壓回路斷線”的預(yù)告信號(hào),同時(shí)光字牌亮,警鈴響。查電壓表可發(fā)現(xiàn):未熔斷相電壓表指示不變,熔斷相的電壓表指示降低或?yàn)榱恪S龅竭@種情況,可檢查電壓互感器二次回路接頭(端子排)處有無松動(dòng)、斷頭、電壓切換回路有無接觸不良等現(xiàn)象和電壓互感器二次熔斷器是否完好,找到松動(dòng)、斷線處應(yīng)立即處理;若更換熔斷器后再次熔斷,應(yīng)查明原因,不可隨意將其熔絲增大。?電壓互感器當(dāng)線路帶電設(shè)備上某點(diǎn)發(fā)生金屬接地時(shí),接地相電壓為零,而正常相的對地電壓值升高到原來的√3倍,產(chǎn)生嚴(yán)重的中性點(diǎn)位移。電壓互感器中性點(diǎn)位移電壓與接地相電壓大小相等,方向相反。如果把線路斷開后,接地仍未消除,則考慮是否與變電站內(nèi)設(shè)備有關(guān),如變壓器、電壓互感器、避雷器、斷路器等接地。

電壓互感器中性點(diǎn)不接地系統(tǒng)電壓不平衡,有可能是電壓互感器高壓側(cè)熔絲熔斷而造成熔斷相電壓降低。由于電壓互感器還好有一定的感應(yīng)電壓,所以其電壓并不為零。而其余兩相為正常電壓,同時(shí)由于斷相造成三相電壓不平衡,故開口三角繞組也會(huì)反映出不平衡電壓,即零序電壓。如:U相高壓熔絲熔斷,零序電壓為32V左右,故能啟動(dòng)接地裝置,發(fā)出接地告警信號(hào)。
電壓互感器二次側(cè)熔絲熔斷時(shí),與一次側(cè)熔絲熔斷情況不一樣,由于一次側(cè)三相電壓仍然平衡,所以開口三角繞組沒有零序電壓,因而不會(huì)發(fā)出接地告警信號(hào),其他現(xiàn)象與一次側(cè)熔絲熔斷后的情況相同。綜上所述,設(shè)備在運(yùn)行過程中,各種電壓不平衡情況,應(yīng)該做到分析判斷準(zhǔn)確,處理及時(shí),才能保障設(shè)備的安全運(yùn)行。對接地信號(hào)不消失的情況,應(yīng)該引起運(yùn)行人員的充分注意,否則會(huì)誤認(rèn)為誤發(fā)信息造成錯(cuò)誤判斷而延誤了故障排除。

產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價(jià)格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個(gè)大概,以便學(xué)習(xí)編程時(shí)查找);
2、由位控邏輯入手,逐漸增加定時(shí)、計(jì)數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個(gè)物理回路驗(yàn)證,比如變頻器+電機(jī)+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時(shí)也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會(huì)一種至于其它的學(xué)習(xí)起來也就簡單了。