TFD-18發電機手包絕緣測量桿性能使用方法

常規(gui)的(de)預防性(xing)試(shi)驗(yan)(yan)一(yi)般(ban)很難發(fa)(fa)現汽輪發(fa)(fa)電(dian)(dian)(dian)機(ji)內冷定(ding)子線端(duan)(duan)部(bu)絕緣的(de)缺陷。直流(liu)加壓表面電(dian)(dian)(dian)位(wei)法試(shi)驗(yan)(yan)能有效地找(zhao)出定(ding)子線圈端(duan)(duan)部(bu)的(de)絕緣缺陷。定(ding)子端(duan)(duan)部(bu)相間(jian)短(duan)路故障，造成很大的(de)經濟損(sun)失(shi)，為(wei)此(ci)，電(dian)(dian)(dian)力工業部(bu)和機(ji)械工業部(bu)下達(da)了(le)安生技（1994）86號文件(jian)(jian)，規(gui)定(ding)了(le)發(fa)(fa)電(dian)(dian)(dian)機(ji)端(duan)(duan)部(bu)手包絕緣測量(liang)試(shi)驗(yan)(yan)為(wei)發(fa)(fa)電(dian)(dian)(dian)機(ji)的(de)重要試(shi)驗(yan)(yan)項目(mu)之一(yi)，TFD-18發(fa)(fa)電(dian)(dian)(dian)機(ji)定(ding)子端(duan)(duan)部(bu)表面電(dian)(dian)(dian)位(wei)測量(liang)桿是*86號文件(jian)(jian)精(jing)神的(de)高(gao)科技產品(pin)，它的(de)投(tou)入使用，極(ji)大地提高(gao)了(le)發(fa)(fa)電(dian)(dian)(dian)機(ji)的(de)檢(jian)修效率。

別(bie)稱(cheng)：電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)差計，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)差計，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)表(biao)面電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)測(ce)(ce)試(shi)儀(yi)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)外(wai)移(yi)測(ce)(ce)試(shi)儀(yi)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)定(ding)子(zi)(zi)手包絕緣測(ce)(ce)試(shi)儀(yi)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)表(biao)面電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)測(ce)(ce)量桿(gan)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)定(ding)子(zi)(zi)線圈端部(bu)表(biao)面電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)測(ce)(ce)量儀(yi). 發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)外(wai)移(yi)檢測(ce)(ce)儀(yi)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)定(ding)子(zi)(zi)端部(bu)絕緣測(ce)(ce)試(shi)儀(yi)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)手包絕緣測(ce)(ce)量桿(gan)

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(shu)入電阻100M

 2．測試電壓：DC0-30KV

 3．電壓精度：1.0%

TFD-18發電機手包絕緣測量桿試驗方法：

1 試驗(yan)標(biao)(biao)準(zhun)發電(dian)(dian)機(ji)定子線圈端(duan)部絕緣判斷(duan)標(biao)(biao)準(zhun)，是加2 倍(bei)的額定電(dian)(dian)壓，漏泄電(dian)(dian)流不大于1微安

2 試驗(yan)儀(yi)器直(zhi)流高(gao)壓(ya)發生(sheng)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
的電(dian)壓(ya)分布將發生(sheng)明顯的變化,絕緣存在缺(que)陷時, Ρρ 減小,絕緣壓(ya)降也降低(di),致使缺(que)陷部位對地電(dian)壓(ya)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(yi)測試電壓和電流(liu)

5．發電機電位外移試驗儀(yi)接線圖

6．尾棒(bang)的地線(xian)(xian)一定與高(gao)壓發生裝置的地線(xian)(xian)接(jie)在一起。

注意事項：

1、錫箔紙(zhi)纏包(bao)端部時(shi)，一定(ding)要包(bao)裹(guo)緊密(mi)，否則錫箔紙(zhi)和絕緣(yuan)表面會(hui)構成電容，測量桿接觸時(shi)會(hui)有較大的放電電流(liu),造成誤判(pan)斷。

2、端部(bu)(bu)(bu)包裹(guo)時分為線棒側和引(yin)水(shui)管側，間(jian)隔大(da)于3厘米，電(dian)位(wei)高(gao)時便于查找是哪一側的(de)問題(ti)，其實zui主要(yao)的(de)點是根(gen)部(bu)(bu)(bu)和錐部(bu)(bu)(bu)，中間(jian)部(bu)(bu)(bu)位(wei)測量意(yi)義不大(da)。

3、測(ce)量桿串接的微安表(biao)(biao)用數字(zi)式微安表(biao)(biao)，即便于讀(du)數又可電流(liu)大時(shi)保護表(biao)(biao)記(ji)。

4、端部(bu)接(jie)頭因為在在機殼下部(bu)，不易測量(liang)，提前(qian)用引(yin)線引(yin)出(chu)。

5、zui重要的是(shi)記正(zheng)確異常槽號，避免張冠李戴，切記切記！

6、發電機不通水的情況下(xia)進行(xing)試驗，要求先將定子冷卻水*吹凈。