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別稱:電(dian)(dian)(dian)位差計,發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)位差計,發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)表(biao)面(mian)電(dian)(dian)(dian)位測(ce)(ce)(ce)試(shi)儀(yi)(yi),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)位外(wai)移(yi)測(ce)(ce)(ce)試(shi)儀(yi)(yi),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)定子手包絕(jue)緣(yuan)測(ce)(ce)(ce)試(shi)儀(yi)(yi),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)表(biao)面(mian)電(dian)(dian)(dian)位測(ce)(ce)(ce)量(liang)桿(gan),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)定子線圈端(duan)部表(biao)面(mian)電(dian)(dian)(dian)位測(ce)(ce)(ce)量(liang)儀(yi)(yi). 發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)位外(wai)移(yi)檢測(ce)(ce)(ce)儀(yi)(yi),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)定子端(duan)部絕(jue)緣(yuan)測(ce)(ce)(ce)試(shi)儀(yi)(yi),發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)(ji)手包絕(jue)緣(yuan)測(ce)(ce)(ce)量(liang)桿(gan)
TFD-18發電機定子手包(bao)絕(jue)緣測(ce)量桿
常規的(de)(de)(de)(de)預防性試(shi)驗(yan)一(yi)般很(hen)難發(fa)現汽(qi)輪發(fa)電(dian)(dian)(dian)機(ji)(ji)(ji)內冷定(ding)(ding)子(zi)線端(duan)(duan)部(bu)絕(jue)緣的(de)(de)(de)(de)缺陷。直流(liu)加壓表面電(dian)(dian)(dian)位法(fa)試(shi)驗(yan)能有(you)效(xiao)地(di)找出定(ding)(ding)子(zi)線圈(quan)端(duan)(duan)部(bu)的(de)(de)(de)(de)絕(jue)緣缺陷。定(ding)(ding)子(zi)端(duan)(duan)部(bu)相間短路故障,造成很(hen)大(da)的(de)(de)(de)(de)經濟損失,為此,電(dian)(dian)(dian)力(li)工業部(bu)和機(ji)(ji)(ji)械工業部(bu)下達了(le)(le)安生技(1994)86號文件(jian),規定(ding)(ding)了(le)(le)發(fa)電(dian)(dian)(dian)機(ji)(ji)(ji)端(duan)(duan)部(bu)手包絕(jue)緣測量(liang)試(shi)驗(yan)為發(fa)電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)(de)重(zhong)要試(shi)驗(yan)項目之(zhi)一(yi),TFD-18發(fa)電(dian)(dian)(dian)機(ji)(ji)(ji)定(ding)(ding)子(zi)端(duan)(duan)部(bu)表面電(dian)(dian)(dian)位測量(liang)桿是*86號文件(jian)精神(shen)的(de)(de)(de)(de)高(gao)科技產品,它(ta)的(de)(de)(de)(de)投入使(shi)用,極大(da)地(di)提高(gao)了(le)(le)發(fa)電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)(de)檢修效(xiao)率。
別(bie)稱:電(dian)位(wei)差(cha)計,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)電(dian)位(wei)差(cha)計,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)表面電(dian)位(wei)測(ce)試(shi)(shi)(shi)儀,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)電(dian)位(wei)外移測(ce)試(shi)(shi)(shi)儀,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)定(ding)子手包(bao)絕緣測(ce)試(shi)(shi)(shi)儀,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)表面電(dian)位(wei)測(ce)量(liang)(liang)桿,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)定(ding)子線(xian)圈端部表面電(dian)位(wei)測(ce)量(liang)(liang)儀. 發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)電(dian)位(wei)外移檢測(ce)儀,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)定(ding)子端部絕緣測(ce)試(shi)(shi)(shi)儀,發(fa)(fa)(fa)(fa)電(dian)機(ji)(ji)手包(bao)絕緣測(ce)量(liang)(liang)桿
發電機定子端部絕緣測試儀,是利用表面電位法(又稱電位外移法)檢測發電機定子線棒絕緣缺陷的絕緣測試方法。通過檢測定子端部手包絕緣的密實性及相對絕緣強度。它可以彌補發電機定子繞組交、直流耐壓試驗所發現不了的端部絕緣缺陷的不足。可以發現引線包絕緣不良,線圈鼻端絕緣包扎缺陷,絕緣盒填充泥填充不滿,綁扎滌玻繩固化不良及端部接頭處定子空心銅線焊接質量不良造成的滲透等缺陷。發電機定子線圈端部表面電位測量是一項新的試驗項目,線圈端部起到了監督作用,進一步提高了發電機安全運行的可靠性。
技術參數:
1.輸入電阻(zu)100M
2.測試電(dian)壓:DC0-30KV
3.電壓精度:1.0%
試驗方法:
1 試驗標準發電(dian)機定(ding)子線圈端部絕緣(yuan)判斷標準,是加2 倍的額定(ding)電(dian)壓,漏泄電(dian)流不大于1微(wei)安
2 試驗儀(yi)器(qi)直流高(gao)壓發生裝置(zhi)
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
的電(dian)壓分布將發生明顯的變化,絕緣存在缺(que)陷(xian)(xian)時(shi), Ρρ 減小,絕緣壓降(jiang)也降(jiang)低,致使(shi)缺(que)陷(xian)(xian)部位對地電(dian)壓增高。
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
,用發電機電位外移試驗儀測試電壓和電流
5.發電(dian)機電(dian)位外移試驗(yan)儀接線圖
6.尾(wei)棒的地線(xian)一定與高(gao)壓發生(sheng)裝置的地線(xian)接在一起。
注意事項:
1、錫箔紙纏包(bao)端部時(shi),一定要包(bao)裹緊(jin)密,否則錫箔紙和絕緣表(biao)面會(hui)構成電(dian)(dian)容,測量(liang)桿接觸時(shi)會(hui)有(you)較大的放電(dian)(dian)電(dian)(dian)流,造成誤(wu)判斷。
2、端部(bu)包(bao)裹時分為線(xian)棒側和引水管(guan)側,間(jian)(jian)隔大于(yu)(yu)3厘米,電位(wei)高時便于(yu)(yu)查(cha)找是(shi)哪一側的問題,其實zui主要(yao)的點是(shi)根(gen)部(bu)和錐部(bu),中(zhong)間(jian)(jian)部(bu)位(wei)測量意義(yi)不大。
3、測量桿串(chuan)接的(de)微安表用數字式微安表,即便于讀(du)數又可電(dian)流大時保護表記。
4、端部接頭因為在(zai)在(zai)機殼下部,不易測量,提前用引線引出(chu)。
5、zui重要(yao)的是記正確異(yi)常槽(cao)號(hao),避免張冠李戴,切(qie)記切(qie)記!
6、發電(dian)機不通水(shui)的情況下進行試(shi)驗,要求先將定子冷卻水(shui)*吹凈。