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      互感(gan)器又稱為儀用變(bian)壓(ya)(ya)器，是電(dian)(dian)流互感(gan)器和(he)電(dian)(dian)壓(ya)(ya)互感(gan)器的統(tong)稱。能將(jiang)高電(dian)(dian)壓(ya)(ya)變(bian)成低(di)電(dian)(dian)壓(ya)(ya)、大電(dian)(dian)流變(bian)成小電(dian)(dian)流，用于(yu)量(liang)測或(huo)保(bao)護系(xi)統(tong)。其功(gong)能主要是將(jiang)高電(dian)(dian)壓(ya)(ya)或(huo)大電(dian)(dian)流按比例變(bian)換成標準(zhun)低(di)電(dian)(dian)壓(ya)(ya)（100V）或(huo)標準(zhun)小電(dian)(dian)流（5A或(huo)1A，均指(zhi)額定值），以便實現測量(liang)儀表、保(bao)護設備(bei)及(ji)自(zi)動控制設備(bei)的標  準(zhun)化、小型化。同時互感(gan)器還可用來隔(ge)開高電(dian)(dian)壓(ya)(ya)系(xi)統(tong)，以保(bao)證人身(shen)和(he)設備(bei)的安全。