電(dian)流互(hu)(hu)感器(qi)(Current Transformer,簡稱(cheng)CT)和電(dian)壓(ya)互(hu)(hu)感器(qi)(Voltage Transformer,簡稱(cheng)VT)是(shi)電(dian)力系統中經常使用(yong)的兩(liang)種(zhong)互(hu)(hu)感器(qi)。雖然它(ta)們都(dou)是(shi)互(hu)(hu)感器(qi),但是(shi)由于其測量物理(li)量不同,所以它(ta)們之間有一些區(qu)別。
電(dian)(dian)流互感器主要用于(yu)變換大電(dian)(dian)流,輸出小電(dian)(dian)流進行(xing)測(ce)量。而電(dian)(dian)壓(ya)互感器則用于(yu)變換高(gao)電(dian)(dian)壓(ya)為低電(dian)(dian)壓(ya)以便于(yu)測(ce)量、保護(hu)等(deng)處(chu)理。CT在(zai)系統(tong)中的應用相對更加廣(guang)泛。
其次(ci),CT和VT在(zai)(zai)電(dian)氣參數方面也(ye)有所(suo)不同(tong)。在(zai)(zai)電(dian)流(liu)(liu)互感器中,輸出(chu)的(de)二次(ci)電(dian)流(liu)(liu)與輸入的(de)一次(ci)電(dian)流(liu)(liu)成正比,即二次(ci)電(dian)流(liu)(liu)是一次(ci)電(dian)流(liu)(liu)的(de)幾(ji)十倍,這個比例關系(xi)稱(cheng)為變比。而在(zai)(zai)電(dian)壓(ya)互感器中,輸出(chu)的(de)二次(ci)電(dian)壓(ya)與輸入的(de)一次(ci)電(dian)壓(ya)成正比,變比相對來說較小,通(tong)常是1:1或者1:100。
此外,CT和(he)VT還依(yi)據其形(xing)狀(zhuang)有所不同。電流互(hu)感(gan)器(qi)的形(xing)狀(zhuang)主(zhu)(zhu)要(yao)(yao)分(fen)為圓柱體、柱形(xing)、方形(xing)等,而電壓互(hu)感(gan)器(qi)的形(xing)狀(zhuang)主(zhu)(zhu)要(yao)(yao)分(fen)為繞組式和(he)母(mu)線式。在實際的電氣系(xi)統中,選擇(ze)不同的互(hu)感(gan)器(qi)類型(xing)和(he)形(xing)狀(zhuang),既要(yao)(yao)滿(man)足測量和(he)保護的需要(yao)(yao),又(you)要(yao)(yao)考慮到(dao)設(she)備成本、維護等因素。
綜上所述(shu),電(dian)(dian)流互(hu)感器(qi)(qi)和電(dian)(dian)壓互(hu)感器(qi)(qi)雖(sui)然都是互(hu)感器(qi)(qi),但是它們(men)(men)之間存在一(yi)些差別(bie)。電(dian)(dian)流互(hu)感器(qi)(qi)主要用(yong)(yong)于(yu)(yu)變(bian)換大電(dian)(dian)流為小(xiao)電(dian)(dian)流進(jin)行測(ce)量(liang),電(dian)(dian)壓互(hu)感器(qi)(qi)則用(yong)(yong)于(yu)(yu)變(bian)換高電(dian)(dian)壓為低電(dian)(dian)壓以便于(yu)(yu)測(ce)量(liang)、保護等(deng)處理。除此之外,它們(men)(men)還有形(xing)狀(zhuang)、電(dian)(dian)氣參數(shu)等(deng)方面的不(bu)同(tong)。