本目錄是上海(hai)蘇(su)特電氣有限公司為您精心選購的:
TFD-18發電機(ji)定子(zi)手包(bao)絕緣(yuan)測量(liang)桿
常規的預防性(xing)試驗一(yi)般很難發(fa)(fa)現汽輪發(fa)(fa)電(dian)機(ji)(ji)內(nei)冷定(ding)子(zi)(zi)線端部(bu)絕緣(yuan)的缺陷。直流加(jia)壓表面(mian)電(dian)位法試驗能(neng)有效地找出定(ding)子(zi)(zi)線圈端部(bu)的絕緣(yuan)缺陷。定(ding)子(zi)(zi)端部(bu)相間短路故障,造(zao)成很大的經(jing)濟損(sun)失,為此,電(dian)力工業(ye)部(bu)和(he)機(ji)(ji)械工業(ye)部(bu)下達了安生(sheng)技(ji)(1994)86號(hao)文(wen)(wen)件,規定(ding)了發(fa)(fa)電(dian)機(ji)(ji)端部(bu)手(shou)包絕緣(yuan)測量試驗為發(fa)(fa)電(dian)機(ji)(ji)的重要試驗項目之一(yi),TFD-18發(fa)(fa)電(dian)機(ji)(ji)定(ding)子(zi)(zi)端部(bu)表面(mian)電(dian)位測量桿是*86號(hao)文(wen)(wen)件精神的高(gao)科(ke)技(ji)產(chan)品,它(ta)的投入使用,極大地提高(gao)了發(fa)(fa)電(dian)機(ji)(ji)的檢修(xiu)效率。
別稱:電位差計,發電機電位差計,發電機表面電位測試儀,發電機電位外移測試儀,發(fa)(fa)電(dian)(dian)機定(ding)(ding)子手包絕(jue)緣測(ce)(ce)試(shi)儀,發(fa)(fa)電(dian)(dian)機表(biao)(biao)面(mian)電(dian)(dian)位測(ce)(ce)量桿(gan),發(fa)(fa)電(dian)(dian)機定(ding)(ding)子線圈端(duan)部表(biao)(biao)面(mian)電(dian)(dian)位測(ce)(ce)量儀. 發(fa)(fa)電(dian)(dian)機電(dian)(dian)位外移檢(jian)測(ce)(ce)儀,發(fa)(fa)電(dian)(dian)機定(ding)(ding)子端(duan)部絕(jue)緣測(ce)(ce)試(shi)儀,發(fa)(fa)電(dian)(dian)機手包絕(jue)緣測(ce)(ce)量桿(gan)
發(fa)電(dian)(dian)機(ji)定(ding)(ding)子(zi)端(duan)部(bu)絕緣(yuan)(yuan)(yuan)測(ce)試儀,是利用(yong)表(biao)面電(dian)(dian)位(wei)法(又稱(cheng)電(dian)(dian)位(wei)外移法)檢(jian)測(ce)發(fa)電(dian)(dian)機(ji)定(ding)(ding)子(zi)線(xian)棒絕緣(yuan)(yuan)(yuan)缺陷的絕緣(yuan)(yuan)(yuan)測(ce)試方(fang)法。通過檢(jian)測(ce)定(ding)(ding)子(zi)端(duan)部(bu)手(shou)包絕緣(yuan)(yuan)(yuan)的密實(shi)性(xing)及(ji)(ji)相對絕緣(yuan)(yuan)(yuan)強度。它(ta)可以彌補(bu)發(fa)電(dian)(dian)機(ji)定(ding)(ding)子(zi)繞(rao)組交(jiao)、直流耐壓試驗(yan)所發(fa)現不(bu)了的端(duan)部(bu)絕緣(yuan)(yuan)(yuan)缺陷的不(bu)足。可以發(fa)現引線(xian)包絕緣(yuan)(yuan)(yuan)不(bu)良,線(xian)圈鼻端(duan)絕緣(yuan)(yuan)(yuan)包扎(zha)(zha)缺陷,絕緣(yuan)(yuan)(yuan)盒填(tian)充(chong)泥填(tian)充(chong)不(bu)滿,綁扎(zha)(zha)滌玻繩固化不(bu)良及(ji)(ji)端(duan)部(bu)接頭處定(ding)(ding)子(zi)空心銅線(xian)焊接質量(liang)不(bu)良造成的滲透等缺陷。發(fa)電(dian)(dian)機(ji)定(ding)(ding)子(zi)線(xian)圈端(duan)部(bu)表(biao)面電(dian)(dian)位(wei)測(ce)量(liang)是一項新(xin)的試驗(yan)項目,線(xian)圈端(duan)部(bu)起到了監督作用(yong),進一步提高了發(fa)電(dian)(dian)機(ji)安(an)全運行的可靠(kao)性(xing)。
技術參數:
1.輸入電阻100M
2.測(ce)試電壓(ya):DC0-30KV
3.電壓精度:1.0%
試驗方法:
1 試(shi)驗標(biao)準發電(dian)(dian)機定(ding)子線(xian)圈端部絕緣判斷標(biao)準,是加(jia)2 倍的額定(ding)電(dian)(dian)壓,漏泄電(dian)(dian)流不大于1微(wei)安(an)
2 試(shi)驗儀器直流高壓(ya)發生裝置
3 測試原理將直流電壓加在定子線棒正常時由于線棒絕緣的體積電阻Ρρ 遠遠大于表面電阻ρσ , 對地電壓很低, 若某一線棒絕緣存在缺陷,它
的(de)電壓(ya)分布將發生明顯的(de)變化,絕(jue)緣存在缺陷時, Ρρ 減(jian)小,絕(jue)緣壓(ya)降也降低,致(zhi)使缺陷部位對(dui)地電壓(ya)增高(gao)。
4 測試方法將繞組三相引出線用導線短路連接,直流高壓發生器加2倍電壓
,用發電(dian)(dian)(dian)機電(dian)(dian)(dian)位(wei)外移試(shi)驗(yan)儀測試(shi)電(dian)(dian)(dian)壓和電(dian)(dian)(dian)流
5.發電(dian)機電(dian)位(wei)外移試(shi)驗儀接線圖
6.尾棒的地(di)線(xian)(xian)一(yi)定(ding)與高壓發(fa)生裝(zhuang)置的地(di)線(xian)(xian)接在一(yi)起。
注意事項:
1、錫(xi)箔紙纏包端部時,一定要包裹(guo)緊密,否則(ze)錫(xi)箔紙和絕緣表面會構(gou)成電(dian)(dian)(dian)容,測(ce)量桿接觸時會有(you)較(jiao)大的放電(dian)(dian)(dian)電(dian)(dian)(dian)流,造(zao)成誤判斷。
2、端部(bu)(bu)包(bao)裹時(shi)分為線棒側和引水管側,間隔大于3厘(li)米(mi),電位(wei)(wei)高時(shi)便(bian)于查找是哪一側的問(wen)題,其實zui主(zhu)要(yao)的點是根(gen)部(bu)(bu)和錐部(bu)(bu),中(zhong)間部(bu)(bu)位(wei)(wei)測量意義不大。
3、測量桿串接的微(wei)安表用(yong)數字式(shi)微(wei)安表,即便(bian)于讀數又(you)可電流大時保護表記。
4、端部接頭(tou)因為在在機殼下部,不易測量,提前(qian)用引線引出(chu)。
5、zui重要的(de)是記(ji)正確異常槽號,避免張冠李戴,切記(ji)切記(ji)!
6、發電機不(bu)通水的(de)情況下進(jin)行試驗,要求先將定子(zi)冷卻水*吹(chui)凈。