直(zhi)流(liu)(liu)系(xi)統(tong)(tong)接(jie)(jie)(jie)地(di)是(shi)一種易(yi)發(fa)生(sheng)且對電(dian)(dian)力(li)系(xi)統(tong)(tong)危(wei)害較大的(de)故障。直(zhi)流(liu)(liu)系(xi)統(tong)(tong)正極接(jie)(jie)(jie)地(di)，可(ke)(ke)能(neng)造成繼電(dian)(dian)保(bao)(bao)(bao)護(hu)誤(wu)動(dong)，因為跳閘線(xian)圈接(jie)(jie)(jie)直(zhi)流(liu)(liu)電(dian)(dian)源負極，系(xi)統(tong)(tong)再有一點(dian)接(jie)(jie)(jie)地(di)或(huo)絕(jue)緣不良，可(ke)(ke)能(neng)引起(qi)保(bao)(bao)(bao)護(hu)誤(wu)動(dong)；直(zhi)流(liu)(liu)系(xi)統(tong)(tong)負極接(jie)(jie)(jie)地(di)，系(xi)統(tong)(tong)再有一點(dian)接(jie)(jie)(jie)地(di)或(huo)絕(jue)緣不良，可(ke)(ke)將跳閘回(hui)路或(huo)合閘回(hui)路短路，造成保(bao)(bao)(bao)護(hu)拒(ju)(ju)動(dong)，此時(shi)系(xi)統(tong)(tong)發(fa)生(sheng)故障，保(bao)(bao)(bao)護(hu)的(de)拒(ju)(ju)動(dong)必然導致系(xi)統(tong)(tong)事故擴大，同時(shi)還可(ke)(ke)能(neng)燒壞繼電(dian)(dian)器的(de)觸點(dian)或(huo)燒保(bao)(bao)(bao)險(xian)。
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