07DC92

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描述

07DC92

定子繞組槽內(nèi)有接地點(diǎn)的尋找和處理
? ? 定子繞組槽內(nèi)接地,一般多發(fā)生在槽口。由于槽絕緣紙?jiān)诓劭趬|偏、損壞,或在槽口因下線、劃線不慎,將漆包線放到槽絕緣紙的下面,或在打入槽楔時(shí)將槽絕緣紙擠破,因而造成接地故障。
? ? 對(duì)于這種故障,首先要判定電機(jī)繞組是否受潮,如果是受潮就對(duì)電機(jī)進(jìn)行烘烤,結(jié)果無效,則判斷為有接地故障。
? ? 尋找接地點(diǎn)的方法有如下幾點(diǎn):
? ? 1、仔細(xì)檢查引出線和槽子兩端,發(fā)現(xiàn)引出線完好,槽子兩端槽口絕緣均無損壞,電機(jī)內(nèi)外很干凈,各處無灰塵及油污,這說明接地點(diǎn)在槽內(nèi)。
? ? 2、解開定子繞組的Y型連接點(diǎn),分別測量各相對(duì)地絕緣電阻,查出有接地故障的相。
? ? 3、用一臺(tái)單相調(diào)壓器,其輸出端的相線接到有接地故障相的一端引出線上,零線接電機(jī)機(jī)殼,然后將調(diào)壓器從零開始升壓,至槽內(nèi)冒煙,這是立即將調(diào)壓器輸出電壓將為零并切斷電源,冒煙處就是接地點(diǎn)。整個(gè)操作過程都要注意安全,要將電機(jī)放在一塊絕緣墊上,切斷電源前人身不能接觸電機(jī)。
? ? 處理方法是:把有接地槽的槽楔小心去除,然后將電機(jī)放入烘箱內(nèi)加熱,烘軟繞組,然后仔細(xì)將槽內(nèi)線匝取出,檢查各導(dǎo)線絕緣。絕緣被破壞的要涂漆、烘干,然后重新在槽內(nèi)放置槽絕緣紙,再將所取出的線匝放入槽內(nèi),打入槽楔,繞組浸漆、烘干。
? ? 如發(fā)現(xiàn)漆包線已被燒斷,要將兩根斷線頭分別拉到繞組的端部,然后找一根線徑相同的漆包線放入槽內(nèi),在繞組兩端部接線。接頭要絞合錫焊、涂漆、烘干,再套上絕緣套管。捆扎端部時(shí),要注意捆扎接頭。
定子繞組匝間短路故障的判斷
? ? 定子繞組匝間短路故障,一般是通過測量三相繞組的直流電阻來判斷的。但容量較大的電機(jī)定子繞組直流電阻很小,加上儀表精度及測量誤差等關(guān)系的影響,不易得出正確的判斷,但可以采用如下辦法來判斷。
? ? 不分解電機(jī),用一臺(tái)容量適當(dāng)?shù)膯蜗嘧择钫{(diào)壓器,從零開始逐步升壓,向其中一相通入低壓交流電。同時(shí),用一只鉗形電流表測量電流,使電流上升到電機(jī)額定電流的1/3左右。然后停止升壓,用萬用表分別測量其它兩相感應(yīng)電壓,如果某一相有匝間短路故障,它的感應(yīng)電壓就比另一相低。然后調(diào)換一相通電,用同樣的方法測量其它兩相的感應(yīng)電壓。根據(jù)感應(yīng)電壓是否相同,可判斷出是否有匝間短路故障

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,福克斯波羅、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。