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        1. 上海乾思生物科技有限公司
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          水泵跳閘故障排除的幾種方法

          時間:2011/11/24閱讀:634
          分享:
          乾思生物編輯整理:
          水泵跳閘故障排除的幾種方法:
          水泵跳閘故障的排除方法 
              1:故障現(xiàn)象:某電廠125 mw機(jī)組自投產(chǎn)以來,給水泵偶爾會發(fā)生一合閘即跳閘的問題,并無任何信號繼電器掉牌。在排除了開關(guān)機(jī)構(gòu)故障后,按常規(guī)方法檢查電纜、二次回路接線和各繼電器及其定值都正常,再次啟動又往往成功。后懷疑是dcs系統(tǒng)軟故障造成的,但改在控制盤上操作,仍會出現(xiàn)此現(xiàn)象。 
              2:試驗查找原因:為查清此現(xiàn)象的原因,觀察開關(guān)合閘過程中各表計的變化情況,以確認(rèn)是何原因使水泵跳閘。試驗其中電壓表監(jiān)視微機(jī)跳閘回路,毫安表監(jiān)視差動繼電器1cj、2cj動作情況,電流表監(jiān)視熱工保護(hù)回路。接好表計后,啟動給水泵,經(jīng)過一段時間的試驗,終于有一次一啟動就水泵跳閘,同時觀察到毫安表的指針偏轉(zhuǎn)了一下,其它監(jiān)視表計沒有反應(yīng),新?lián)Q上的xjl-0025/31型集成塊式信號繼電器1xj亦動作掉牌,表明是由差動保護(hù)動作導(dǎo)致水泵跳閘。
              3:根源分析:差動保護(hù)動作,首先懷疑被保護(hù)設(shè)備內(nèi)部有故障。通過常規(guī)檢查,給水泵電機(jī)及其電纜正常,差動繼電器校驗正常,電流互感器極性連接正確。在排除設(shè)備故障和接線錯誤的原因后,差動保護(hù)在電機(jī)啟動過程中動作,表明在這過程中差動回路的差電流超過差動繼電器整定值。正常情況下引起差動回路差電流的原因主要有兩點(diǎn):一是電機(jī)首尾兩側(cè)的電流互感器變比誤差不同,存在一個很小的差電流,這個差電流小于電機(jī)額定電流id的5%。二是首尾兩側(cè)電流互感器二次負(fù)荷的差別也會引起其變比的差別,從而存在一個差電流。在給水泵電機(jī)差動保護(hù)回路中的電流互感器負(fù)荷差別只是二次電纜長度的不同,大約相差50 m,并且在額定電流下,差動繼電器的功率消耗不大于3 va,二次負(fù)載并不重。檢查發(fā)現(xiàn)給水泵電機(jī)差動保護(hù)用的首尾側(cè)電流互感器型號均為lmzbj-10,b級15倍額定電流,變比600/5,容量40 va,完滿足二次負(fù)載的要求。
              以上水泵跳閘的分析是基于正常運(yùn)行的條件下,在電機(jī)啟動時,情況又有所不同。電機(jī)啟動時電流很大,首尾兩側(cè)的電流互感器可能飽和,此時由于各電流互感器磁化特性不一致,二次差電流可能很大。根據(jù)阿城繼電器廠的lcd-12型差動繼電器整定說明,繼電器的動作電流整定值izd=△i1×kk×in/n=0.06×3×356/120=0.534a(式中:△i1—首、尾端電流互感器正常運(yùn)行時的zui大誤差,0.04~0.06;kk—可靠系數(shù),2~3;in—電機(jī)額定電流;n—電流互感器變比)。應(yīng)整定在1.0a的位置。在使用b級互感器的情況下,差動繼電器動作電流整定在1.,制動系數(shù)為0.4時,差動保護(hù)在電機(jī)啟動時仍偶爾會動作,是由于b級電流互感器磁化特性飽和點(diǎn)較低,抗飽和能力較低,不能滿足差動繼電器的要求。通常要求差動保護(hù)回路的電流互感器采用d級,d級互感器的飽和點(diǎn)高一些,沒那么容易飽和,可以減小電機(jī)啟動時流過差動回路的差電流。在更換為d級的電流互感器,同時把差動繼電器動作電流整定在1.0a,制動系數(shù)為0.4后,再沒出現(xiàn)過開關(guān)一合閘即水泵跳閘的故障。 

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