由于繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)的(de)(de)(de)內(nei)部(bu)部(bu)分(fen)是電(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)路,很(hen)容(rong)易受到強(qiang)電(dian)(dian)(dian)場(chang)和(he)強(qiang)磁場(chang)的(de)(de)(de)干擾(rao),殼體接地屏蔽有利于改善繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)的(de)(de)(de)工作環境(jing),微機(ji)(ji)(ji)保護(hu)(hu)應提高(gao)繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)的(de)(de)(de)可靠性。為(wei)了保證微機(ji)(ji)(ji)繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)的(de)(de)(de)可靠性,應通過抑制干擾(rao)源、阻斷耦(ou)合(he)通道、提高(gao)敏感電(dian)(dian)(dian)路的(de)(de)(de)抗干擾(rao)能力、采(cai)用自動檢測(ce)(ce)技術和(he)容(rong)錯設計(ji)來保證微機(ji)(ji)(ji)繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)的(de)(de)(de)可靠性。以確保繼電(dian)(dian)(dian)保護(hu)(hu)測(ce)(ce)試(shi)儀(yi)裝置停止運行(xing)。
繼(ji)電保護(hu)測試儀的日常維護(hu)應嚴格(ge)執行,養成良(liang)好的習慣,注意每次使用后(hou)的清洗、維護(hu)和(he)停電:
1、值班(ban)人(ren)員(yuan)對繼電保(bao)護測(ce)試儀(yi)進行定期檢查和檢查,并做好記(ji)錄尤為(wei)必要;
2、做好微型繼電保護測試儀(yi)的收尾工作,收尾工作必須由兩(liang)人進(jin)行(xing),防止(zhi)誤(wu)碰運行(xing)設(she)(she)備(bei),與帶電設(she)(she)備(bei)保持安全距離,避免(mian)人身觸電和二(er)次回路短路及接地事故;
3、每周記錄一次繼電(dian)保護測試儀的(de)電(dian)流(liu)和電(dian)壓(ya)采樣值,記錄差動保護的(de)差動電(dian)流(liu)值;
4、定期對繼(ji)電保護測試儀端子排進(jin)行紅外測溫。能盡快檢測到接(jie)觸不良發熱(re);
5、定(ding)期對(dui)繼電保(bao)護測試儀打(da)印機(ji)進行檢查和(he)打(da)印。防止(zhi)數據丟(diu)失;
6、專業人員每月對繼電保護(hu)測(ce)試儀進(jin)行(xing)檢(jian)查(cha),查(cha)看是否有(you)故障,并通過多種方式檢(jian)查(cha)準確度誤差(cha)。以及故障發生后(hou)是否及時進(jin)行(xing)故障分析;
繼(ji)電(dian)保護測(ce)試儀防電(dian)磁(ci)干擾措施:
在變電(dian)(dian)(dian)站試(shi)(shi)(shi)驗(yan)中,用(yong)(yong)微機保(bao)(bao)護(hu)(hu)代(dai)替(ti)電(dian)(dian)(dian)磁保(bao)(bao)護(hu)(hu)時,繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)必(bi)須(xu)(xu)采(cai)取防(fang)止電(dian)(dian)(dian)磁干擾(rao)的(de)(de)(de)技術(shu)措施,即嚴格執行繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)的(de)(de)(de)安(an)裝條件,安(an)裝電(dian)(dian)(dian)纜有屏蔽(bi)層,兩端屏蔽(bi)層必(bi)須(xu)(xu)接地(di),這樣做的(de)(de)(de)目的(de)(de)(de)是(shi)防(fang)止電(dian)(dian)(dian)路(lu)太長。當一(yi)端接地(di)時,另一(yi)端會因(yin)電(dian)(dian)(dian)磁干擾(rao)而產生電(dian)(dian)(dian)壓(ya)和電(dian)(dian)(dian)流(liu),導致微機繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)被拒或誤操作。為了降低繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)的(de)(de)(de)故障率(lv)(lv)和誤差率(lv)(lv),必(bi)須(xu)(xu)對繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)進(jin)行優化設計,合(he)理(li)制造(zao)和使用(yong)(yong)高質(zhi)量的(de)(de)(de)元器件,同時,應采(cai)用(yong)(yong)屏蔽(bi)隔離技術(shu)來(lai)保(bao)(bao)證繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)的(de)(de)(de)可靠性(xing),從而提(ti)高繼(ji)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)測(ce)(ce)(ce)試(shi)(shi)(shi)儀(yi)(yi)(yi)的(de)(de)(de)抗(kang)干擾(rao)能力。