直流(liu)(liu)系(xi)(xi)統(tong)接地(di)(di)(di)是(shi)一(yi)種易發(fa)生且對電(dian)(dian)力(li)系(xi)(xi)統(tong)危(wei)害(hai)較(jiao)大的故(gu)障。直流(liu)(liu)系(xi)(xi)統(tong)正極(ji)(ji)接地(di)(di)(di)，可(ke)能(neng)(neng)造成(cheng)繼(ji)電(dian)(dian)保(bao)護(hu)誤動(dong)，因為(wei)跳閘線圈(quan)接直流(liu)(liu)電(dian)(dian)源負極(ji)(ji)，系(xi)(xi)統(tong)再(zai)(zai)有一(yi)點接地(di)(di)(di)或(huo)(huo)絕緣(yuan)不良(liang)，可(ke)能(neng)(neng)引起保(bao)護(hu)誤動(dong)；直流(liu)(liu)系(xi)(xi)統(tong)負極(ji)(ji)接地(di)(di)(di)，系(xi)(xi)統(tong)再(zai)(zai)有一(yi)點接地(di)(di)(di)或(huo)(huo)絕緣(yuan)不良(liang)，可(ke)將(jiang)跳閘回(hui)路(lu)或(huo)(huo)合(he)閘回(hui)路(lu)短(duan)路(lu)，造成(cheng)保(bao)護(hu)拒(ju)動(dong)，此(ci)時系(xi)(xi)統(tong)發(fa)生故(gu)障，保(bao)護(hu)的拒(ju)動(dong)必然導致(zhi)系(xi)(xi)統(tong)事故(gu)擴大，同(tong)時還(huan)可(ke)能(neng)(neng)燒壞繼(ji)電(dian)(dian)器的觸點或(huo)(huo)燒保(bao)險。
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