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塑殼斷路(lu)器(qi)是用來分配電能(neng)(neng)和(he)保護線路(lu)及電源設備受過載、短路(lu)、 欠電壓等故(gu)障的(de)損壞，而的(de)基(ji)本(ben)、的(de)重要的(de)功(gong)能(neng)(neng)是正確動(dong)作并迅(xun)速切(qie)除電網故(gu)障，塑殼斷路(lu)器(qi)的(de)操動(dong)失靈通(tong)常(chang)表現為以下兩(liang)種(zhong)形式：拖動(dong)和(he)誤動(dong)。若斷路(lu)器(qi)發生拖動(dong)或誤動(dong)，將(jiang)對(dui)電網構成(cheng)嚴重威脅，擴大事故(gu)影響(xiang)范圍，可(ke)能(neng)(neng)還會造成(cheng)全(quan)廠停電。

操動失靈(ling)的原因：

1.操動(dong)機(ji)構缺陷。

操動(dong)機(ji)構(gou)(gou)(gou)包括電磁機(ji)構(gou)(gou)(gou)、彈(dan)簧機(ji)構(gou)(gou)(gou)和液壓(ya)機(ji)構(gou)(gou)(gou)。對電磁與彈(dan)簧機(ji)構(gou)(gou)(gou)，其機(ji)構(gou)(gou)(gou)機(ji)械(xie)(xie)故障的主(zhu)要原因是(shi)卡澀不靈活。另一(yi)個原因是(shi)鎖扣調整(zheng)不當(dang)。對液壓(ya)機(ji)構(gou)(gou)(gou)，其機(ji)械(xie)(xie)故障主(zhu)要是(shi)密封不良造成(cheng)的，因此保證高油壓(ya)部位密封可(ke)靠(kao)是(shi)特別重要的。

2．塑殼斷路器(qi)本(ben)體的(de)機械(xie)缺陷

造成(cheng)斷路器(qi)本(ben)體操動失靈的缺(que)陷，其中包括瓷瓶損壞、連接部位(wei)松動,零部件(jian)損壞和(he)異物(wu)卡澀等。

3．操作（控(kong)制）電源缺(que)陷

在(zai)操(cao)(cao)作電(dian)(dian)(dian)(dian)源缺(que)陷中，操(cao)(cao)作電(dian)(dian)(dian)(dian)壓(ya)(ya)不足是的(de)(de)常見的(de)(de)缺(que)陷。其原因多(duo)半是由于電(dian)(dian)(dian)(dian)站采用交流電(dian)(dian)(dian)(dian)源經硅整(zheng)流后作操(cao)(cao)作電(dian)(dian)(dian)(dian)源，在(zai)系統發生故障(zhang)時，電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓(ya)(ya)大幅度降(jiang)低(di)，或雖有蓄電(dian)(dian)(dian)(dian)池組，但操(cao)(cao)作電(dian)(dian)(dian)(dian)源至斷(duan)(duan)路器(qi)處連線壓(ya)(ya)降(jiang)太(tai)大，使實際操(cao)(cao)作電(dian)(dian)(dian)(dian)壓(ya)(ya)低(di)于規定的(de)(de)下(xia)限。例如(ru)某變電(dian)(dian)(dian)(dian)所(suo)因一條配電(dian)(dian)(dian)(dian)線路發生故障(zhang)，斷(duan)(duan)路器(qi)在(zai)重合時爆炸(zha)。

相應(ying)的預防措施：

1.定期維護電磁與彈簧機構，防止出現卡(ka)澀、零部件損(sun)壞。

2.擰緊鎖扣處的(de)螺(luo)(luo)釘(ding)(ding)，防止螺(luo)(luo)釘(ding)(ding)松動、變位等故障。

3.保證高油壓部位的密封性

4.檢查輔助開(kai)關、微動(dong)(dong)開(kai)關是否完好，防止輔助開(kai)關不(bu)切換或接觸不(bu)良而造成操作線圈燒壞和(he)拒動(dong)(dong)。

5.及時檢修、更換(huan)鏈接部位(wei)零件

6.新建變電(dian)(dian)(dian)站建議采用蓄電(dian)(dian)(dian)池和儲(chu)能(neng)式作為操作電(dian)(dian)(dian)源。