DP620

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描述

DP620

在中性點不接地的供電系統(tǒng)中發(fā)生單相對地,非故障相對地電壓可能升高為1.732倍相電壓(即線電壓),由于電容的倍壓效益,接地點的間歇性電弧可能在電網(wǎng)中引起更高的過電壓,使非故障相的絕緣薄弱點被擊穿,造成兩相短路,尤其電纜線路會因電弧發(fā)熱得不到及時散發(fā)而爆炸。而對于一些中性點不接地系統(tǒng),在發(fā)生單相漏電時,因為沒有泄露回路或回路電阻過大,而設(shè)備仍可以正常運(yùn)行的原因,而因接地電流很小,問題不容易暴露,而當(dāng)漏電電流一旦與接地良好的金屬連接,就有火花放電等現(xiàn)象發(fā)生,系統(tǒng)就出現(xiàn)工作不正?,F(xiàn)象。因此對于這些小電流接地系統(tǒng)發(fā)生單相漏電時,不允許長時間運(yùn)行,應(yīng)盡快查出漏電部位并采取保護(hù)。
而對于中性點接地的供電系統(tǒng),當(dāng)發(fā)生單相接地故障時,接地點與供電設(shè)備接地點之間就會形成回路,接地電流很大,這種系統(tǒng)被稱做大電流接地系統(tǒng),而兩個接地點的阻值越小,接地電流就越大。所以對于中性點接地系統(tǒng),中性點直接接地運(yùn)行方式下應(yīng)做到以下三點:①所有用電設(shè)備在正常情況下不帶電的金屬部分,都必須采用保護(hù)接零或保護(hù)接地;②在三相四線制的同一低壓配電系統(tǒng)中,保護(hù)接零和保護(hù)接地不能混用,即一部分采用保護(hù)接零,而另一部分采用保護(hù)接地,但若在同一臺設(shè)備上同時采用保護(hù)接零和保護(hù)接地則是允許的,因為其安全效果更好;③要求中性線必須重復(fù)接地,因為在中性線斷開的情況下,接零設(shè)備外殼上都帶有220V的對地電壓,這是絕不允許的。?而我個人認(rèn)為,有了這些很好的接地理論及體系,在設(shè)計及施工過程中,要實現(xiàn)徹底的接地保護(hù),有兩個工作重點也是不容忽視的,第一部分接地裝置的安裝,它們必須確保接地阻值在設(shè)計范圍之內(nèi),具備安全、可靠的優(yōu)點,而且需要通過定期的測量確定接地可靠性;
第二部分就是引下線及接閃器,設(shè)備、金屬結(jié)構(gòu)及用電裝置殼體等與接地網(wǎng)的可靠、正確連接。因為有可能一點疏忽就可能對設(shè)備及人生的接地保護(hù)上失敗。例如,我們通常所有的接地連接在一起,構(gòu)成一張嚴(yán)密的網(wǎng),而各種設(shè)備與他們連接的點不同也是有很大區(qū)別的。如果你認(rèn)為,所有的接地都連接在一起,而選擇儀表接地時想就近,選擇了一根防雷引下線作為儀表系統(tǒng)接地的引入點,在發(fā)生雷擊過電流時,就有可能因大的雷擊過電流及強(qiáng)的電磁感應(yīng)對儀表設(shè)備及PLC等一些接地要求很嚴(yán)格的精密設(shè)備贊成損壞。所以接地連接需要我們一定按設(shè)計及規(guī)范施工。通常情況下,對于單個建筑物,從接地極、接地網(wǎng)(底下暗敷部分)到等電位接地板,需要將接地網(wǎng)引上點都接到此點,再由此往各個設(shè)備及及需要接地保護(hù)的部位連接,這樣避免電器漏電或雷擊過電流給人造成傷害,也避免給其他設(shè)備造成損壞。漏電流直接由接地線通過等電位接地板對地放電,從而達(dá)到接地的目的。

產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,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
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
? 專業(yè)銷售進(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? 國內(nèi)實力庫存商家

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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

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? 國內(nèi)實力庫存商家


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。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(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(最好是有個物理回路驗證,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)會一種至于其它的學(xué)習(xí)起來也就簡單了。