剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)互感器(qi)(qi)與評估(gu)單元結合使用，以(yi)監(jian)控和保護(hu)(hu)電(dian)(dian)路。變壓器(qi)(qi)組成MFIW系列與MFR評估(gu)單元相結合，形(xing)成符合VDE 0660-101標準(zhun)的(de)(de)模塊化剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)裝置（MRCD）。具有(you)特征A的(de)(de)剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)互感器(qi)(qi)檢(jian)測正弦交流(liu)(liu)電(dian)(dian)流(liu)(liu)以(yi)及脈(mo)動直流(liu)(liu)剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)。變壓器(qi)(qi)覆(fu)蓋通(tong)向消(xiao)耗的(de)(de)所有(you)有(you)源導體，并使用其輸出信號來說(shuo)明流(liu)(liu)過(guo)它的(de)(de)所有(you)導體電(dian)(dian)流(liu)(liu)之(zhi)和的(de)(de)時間曲線(xian)(xian)。其輸出信號與剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)成比例(li)，在絕(jue)緣故障情況下或通(tong)過(guo)接(jie)地，剩(sheng)(sheng)余電(dian)(dian)流(liu)(liu)通(tong)過(guo)保護(hu)(hu)接(jie)地導線(xian)(xian)流(liu)(liu)回供電(dian)(dian)干線(xian)(xian)的(de)(de)接(jie)地點(dian)。