直流(liu)(liu)系(xi)統(tong)(tong)接(jie)(jie)地(di)是一種(zhong)易發生且對電(dian)力系(xi)統(tong)(tong)危(wei)害較(jiao)大的(de)故(gu)(gu)障。直流(liu)(liu)系(xi)統(tong)(tong)正極(ji)接(jie)(jie)地(di)，可(ke)能造成(cheng)繼(ji)電(dian)保(bao)護誤動，因為跳(tiao)閘(zha)線圈接(jie)(jie)直流(liu)(liu)電(dian)源負極(ji)，系(xi)統(tong)(tong)再有一點(dian)接(jie)(jie)地(di)或(huo)絕緣(yuan)不良，可(ke)能引起保(bao)護誤動；直流(liu)(liu)系(xi)統(tong)(tong)負極(ji)接(jie)(jie)地(di)，系(xi)統(tong)(tong)再有一點(dian)接(jie)(jie)地(di)或(huo)絕緣(yuan)不良，可(ke)將跳(tiao)閘(zha)回(hui)路或(huo)合閘(zha)回(hui)路短路，造成(cheng)保(bao)護拒動，此時(shi)系(xi)統(tong)(tong)發生故(gu)(gu)障，保(bao)護的(de)拒動必然導致系(xi)統(tong)(tong)事故(gu)(gu)擴大，同時(shi)還可(ke)能燒壞繼(ji)電(dian)器(qi)的(de)觸點(dian)或(huo)燒保(bao)險。
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