140CPS12400

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描述

140CPS12400
若不止一臺(tái)變壓器時(shí),運(yùn)行方式往往只允許1-2臺(tái)接地運(yùn)行,設(shè)計(jì)采用中性點(diǎn)零序電流繼電器與經(jīng)相鄰變壓器中性點(diǎn)零序電流繼電器控制的零序電壓繼電器配合使用的變壓器保護(hù)方案,保護(hù)回路設(shè)計(jì)先跳中性點(diǎn)不接地變壓器,然后中性點(diǎn)跳直接接地的變壓器,以防止不接地系統(tǒng)故障點(diǎn)的間歇性弧光過(guò)電壓危及電氣設(shè)備的安全。為避免全廠(chǎng)所有變壓器全部被切的嚴(yán)重后果,保護(hù)時(shí)間應(yīng)逐級(jí)配合,先斷開(kāi)母聯(lián)或分?jǐn)嗦菲?,再?jīng)零序電壓元件跳開(kāi)中心點(diǎn)不接地主變,最后經(jīng)零序電流元件跳開(kāi)中性點(diǎn)接地主變。對(duì)中性點(diǎn)有可能直接接地運(yùn)行,也有可能不接地運(yùn)行的主變,因失去接地中性點(diǎn)引起的電壓升高,應(yīng)裝設(shè)相應(yīng)的保護(hù)裝置。在直接接地時(shí)用零序電流保護(hù)。在中性點(diǎn)不接地時(shí)用零序電壓保護(hù)或裝設(shè)放電間隙保護(hù),放到間隙保護(hù)起到過(guò)電壓保護(hù)的作用,當(dāng)放電間隙被擊穿形成零序電流通路時(shí),利用接在放電間隙回路的零序電流保護(hù),切除該變壓器。變壓器采用放電間隙保護(hù),放電間隙裝于變壓器中性點(diǎn)與地線(xiàn)之間、有棒形、球形、角形等多種形式,實(shí)際安裝中可以棒形用得最多,零序電壓保護(hù)動(dòng)作電壓按發(fā)生單相接地故障時(shí)保護(hù)安裝處可能出現(xiàn)最大零序電壓整定。對(duì)變壓器高壓側(cè)中性點(diǎn)直接接地的自耦變壓器和三繞組變壓器采用零序過(guò)電流保護(hù),取自變壓器中性點(diǎn)的零序CT安裝無(wú)方向零序保護(hù),在主變兩側(cè)分別裝上零序保護(hù),了為滿(mǎn)足選擇性可增設(shè)零序方向元件。方向元件用各斷路器側(cè)CT的自產(chǎn)零序電流。主變中性點(diǎn)零序電流互感器的極性接線(xiàn)可以將中性點(diǎn)零序電流保護(hù)指向本側(cè)母線(xiàn)或主變側(cè)。采用斷路器處的零序電流保護(hù),和一般高中壓側(cè)方向指向各自的母線(xiàn),但當(dāng)中壓側(cè)不無(wú)源時(shí),高壓側(cè)零序方向可指向主變。指向母線(xiàn)保護(hù)的范圍以為斷路器電流互感器安裝處開(kāi)始,需要與線(xiàn)路零序保護(hù)配合。指向主變變壓器,需要主變壓器另一側(cè)出線(xiàn)的接地保護(hù)相配合。采用主變中性點(diǎn)處地零序電流保護(hù),則保護(hù)范圍比斷路器處零序電流保護(hù)比要寬一些。小浪底目前運(yùn)行的主變中性點(diǎn)零序電流保護(hù)無(wú)方向,這樣的整定配合比較清晰方便,一是限制跳開(kāi)母聯(lián)斷路器,二是限制跳開(kāi)本側(cè)開(kāi)關(guān)。

產(chǎn)品承
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(shì)價(jià)格,大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門(mén)子,摩托羅拉,安川。力士樂(lè)。ACSO,橫河等進(jìn)口品牌。 專(zhuān)業(yè)銷(xiāo)售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
? 專(zhuān)業(yè)銷(xiāo)售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家

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PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣,選擇放心,售后無(wú)憂(yōu)大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營(yíng):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(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè),ACSO,力士樂(lè)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(cè)”(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(lèi)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(cè)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(lái)也就簡(jiǎn)單了。