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水泵故障(zhang)現象：發(fa)電(dian)(dian)(dian)廠(chang)125mw機組自投產以(yi)來(lai)，水(shui)泵偶(ou)爾(er)會(hui)發(fa)生一合閘(zha)即跳(tiao)閘(zha)的問題(ti)，并無任何信號(hao)繼電(dian)(dian)(dian)器(qi)掉(diao)牌。在排除了開關機構故障(zhang)后(hou)，按常規方法檢(jian)查(cha)(cha)電(dian)(dian)(dian)纜、二(er)次(ci)回(hui)路接(jie)線(xian)和各(ge)繼電(dian)(dian)(dian)器(qi)及其(qi)(qi)定(ding)值(zhi)都正常，再次(ci)啟動(dong)(dong)(dong)(dong)又往(wang)往(wang)成功。后(hou)懷疑是(shi)(shi)dcs系統軟(ruan)故障(zhang)造(zao)成的，但改(gai)在控制盤(pan)上操(cao)作(zuo)，仍會(hui)出現此現象。試(shi)驗(yan)查(cha)(cha)找(zhao)原(yuan)(yuan)因：為查(cha)(cha)清楚(chu)此現象的原(yuan)(yuan)因，觀察(cha)(cha)開關合閘(zha)過程中(zhong)各(ge)表(biao)(biao)(biao)(biao)(biao)計的變化情況(kuang)，以(yi)確認是(shi)(shi)何原(yuan)(yuan)因使其(qi)(qi)跳(tiao)閘(zha)。試(shi)驗(yan)其(qi)(qi)中(zhong)電(dian)(dian)(dian)壓表(biao)(biao)(biao)(biao)(biao)監視(shi)微機跳(tiao)閘(zha)回(hui)路，毫(hao)安表(biao)(biao)(biao)(biao)(biao)監視(shi)差動(dong)(dong)(dong)(dong)繼電(dian)(dian)(dian)器(qi)1cj、2cj動(dong)(dong)(dong)(dong)作(zuo)情況(kuang)，電(dian)(dian)(dian)流表(biao)(biao)(biao)(biao)(biao)監視(shi)熱工保護回(hui)路。接(jie)好表(biao)(biao)(biao)(biao)(biao)計后(hou)，啟動(dong)(dong)(dong)(dong)給水(shui)泵，經過一段時(shi)(shi)間的試(shi)驗(yan)，終于有一次(ci)水(shui)泵一啟動(dong)(dong)(dong)(dong)即跳(tiao)閘(zha)，同時(shi)(shi)觀察(cha)(cha)到毫(hao)安表(biao)(biao)(biao)(biao)(biao)的指針偏(pian)轉了一下(xia)，其(qi)(qi)它監視(shi)表(biao)(biao)(biao)(biao)(biao)計沒有反應，新換(huan)上的xjl-0025/31型(xing)集成塊(kuai)式信號(hao)繼電(dian)(dian)(dian)器(qi)1xj亦動(dong)(dong)(dong)(dong)作(zuo)掉(diao)牌，表(biao)(biao)(biao)(biao)(biao)明是(shi)(shi)由差動(dong)(dong)(dong)(dong)保護動(dong)(dong)(dong)(dong)作(zuo)導致跳(tiao)閘(zha)。

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