AB&80026-044-06

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描述

AB&80026-044-06

電流速斷保護(hù)、顧名思義、就是指電流發(fā)生變化或超過預(yù)先設(shè)置的保護(hù)定值范圍時(shí),而瞬間動(dòng)作的電流保護(hù)。書面定義為:對(duì)于反應(yīng)短路電流幅度增大而瞬間動(dòng)作的電流保護(hù),稱為電流速斷保護(hù),為了保證其微機(jī)保護(hù)裝置選擇性,一般只能保護(hù)線路的一路分,假定每天線路上均裝有電流速斷保護(hù),當(dāng)線路上發(fā)生故障時(shí),希望保護(hù)能瞬間動(dòng)作,他的保護(hù)范圍最好能達(dá)到本線路長的100%,但是這種愿望能否實(shí)現(xiàn),需要作具體分析。
為了解決這個(gè)矛盾可以有兩種方法,通常都是優(yōu)先保證動(dòng)作的選擇性,即從保護(hù)裝置啟動(dòng)參數(shù)的整定上保證下一條線路出口短路時(shí)不啟動(dòng),在微機(jī)保護(hù)技術(shù)中,這又稱為按躲開下一條線路出口處短路條件整定,另一種辦法是在個(gè)別情況下,當(dāng)快速切除故障是首要條件時(shí),用自動(dòng)重合閘來糾正這種無選擇性動(dòng)作。
電網(wǎng)中電氣設(shè)備發(fā)生故障時(shí),短路電流很大,根據(jù)繼電器的基本動(dòng)作原理可知,如果預(yù)先通過計(jì)算,將此短路電流整定為繼電器的動(dòng)作電流,就可對(duì)故障設(shè)備進(jìn)行保護(hù)。過電流保護(hù)和電流速斷保護(hù)正是根據(jù)這個(gè)原理而實(shí)現(xiàn)的。為了保證動(dòng)作的選擇性,根據(jù)短路電流的特點(diǎn)(故障點(diǎn)越靠近電源,則短路電流越大),過電流保護(hù)是帶有動(dòng)作時(shí)限的,而電流速斷保護(hù)則不帶動(dòng)作時(shí)限,即當(dāng)短路發(fā)生時(shí),它立即動(dòng)作而切斷故障,故它沒有時(shí)限特性,常用來和過流保護(hù)配合使用。速斷保護(hù)不能保護(hù)線路全長,只能有選擇性地保護(hù)線路一部分,余下部分為速斷保護(hù)的死區(qū)。為避免上述情況,速斷保護(hù)也可做成略帶時(shí)限,稱為時(shí)限電流速斷保護(hù)。它和無時(shí)限電流速斷配合,以消除電流速斷保護(hù)的動(dòng)作死區(qū)。

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(shì)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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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(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)起來也就簡單了。