母線(xian)(xian)(xian)(xian)橋(qiao)，又稱橋(qiao)式接(jie)(jie)線(xian)(xian)(xian)(xian)，用(yong)跨接(jie)(jie)斷(duan)路(lu)(lu)器(qi)BCD把兩條電(dian)源(yuan)引入線(xian)(xian)(xian)(xian)與兩臺變(bian)壓(ya)器(qi)起來的(de)(de)(de)(de)(de)主接(jie)(jie)線(xian)(xian)(xian)(xian)。較分段單母線(xian)(xian)(xian)(xian)接(jie)(jie)線(xian)(xian)(xian)(xian)簡(jian)化，減少(shao)了斷(duan)路(lu)(lu)器(qi)的(de)(de)(de)(de)(de)數量。根(gen)據(ju)跨接(jie)(jie)橋(qiao)斷(duan)路(lu)(lu)器(qi)的(de)(de)(de)(de)(de)位置不(bu)同，分為內接(jie)(jie)線(xian)(xian)(xian)(xian)橋(qiao)和(he)外接(jie)(jie)線(xian)(xian)(xian)(xian)橋(qiao)。其中內接(jie)(jie)線(xian)(xian)(xian)(xian)橋(qiao)適用(yong)于(yu)線(xian)(xian)(xian)(xian)路(lu)(lu)較長，負荷曲線(xian)(xian)(xian)(xian)比較平穩的(de)(de)(de)(de)(de)變(bian)電(dian)位置；外接(jie)(jie)線(xian)(xian)(xian)(xian)橋(qiao)則適用(yong)于(yu)線(xian)(xian)(xian)(xian)路(lu)(lu)較短(duan)，負荷曲線(xian)(xian)(xian)(xian)變(bian)化較大的(de)(de)(de)(de)(de)變(bian)電(dian)位置。　母線(xian)(xian)(xian)(xian)橋(qiao)刷漆的(de)(de)(de)(de)(de)作用(yong)：絕緣、防(fang)腐、散(san)熱和(he)“相”的(de)(de)(de)(de)(de)標(biao)識。