電壓互感器(qi)在三相電路中常(chang)用的接線方式一共(gong)有四(si)種：

        1．一個(ge)單相電壓互(hu)感(gan)器的接線，用于對稱的三相電路，二次側可接儀表和繼(ji)電器。

        2．兩(liang)個(ge)單相電(dian)壓互感器(qi)的(de)V/V形接線(xian)，可測量線(xian)電(dian)壓，但不能測相電(dian)壓，它廣泛應用(yong)在20kV以下(xia)中性點不接地或經(jing)消弧(hu)線(xian)圖接地的(de)電(dian)網中。

        3．三個單相(xiang)電(dian)(dian)壓(ya)互感器(qi)接(jie)成Y0/Y0形(xing)，可供(gong)給要(yao)(yao)求測量線電(dian)(dian)壓(ya)的(de)儀表(biao)和繼(ji)電(dian)(dian)器(qi)，以及要(yao)(yao)求供(gong)給相(xiang)電(dian)(dian)壓(ya)的(de)絕(jue)緣監察電(dian)(dian)壓(ya)表(biao)。

        4．一(yi)臺三(san)相(xiang)(xiang)五芯柱(zhu)電(dian)(dian)(dian)(dian)(dian)壓(ya)互感器接(jie)(jie)成(cheng)(cheng)Y0/Y0/Δ（開口(kou)三(san)角形(xing)），接(jie)(jie)成(cheng)(cheng)Y0形(xing)的(de)二次線(xian)圈(quan)供(gong)電(dian)(dian)(dian)(dian)(dian)給(gei)(gei)儀(yi)表、繼電(dian)(dian)(dian)(dian)(dian)器及絕(jue)緣(yuan)監(jian)察電(dian)(dian)(dian)(dian)(dian)壓(ya)表等。輔助二次線(xian)圈(quan)接(jie)(jie)成(cheng)(cheng)開口(kou)三(san)角形(xing)，供(gong)電(dian)(dian)(dian)(dian)(dian)給(gei)(gei)絕(jue)緣(yuan)監(jian)察電(dian)(dian)(dian)(dian)(dian)壓(ya)繼電(dian)(dian)(dian)(dian)(dian)器。當三(san)相(xiang)(xiang)系統(tong)正(zheng)常工作時(shi)，三(san)相(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)平衡，開口(kou)三(san)角形(xing)兩(liang)端電(dian)(dian)(dian)(dian)(dian)壓(ya)為零。當某一(yi)相(xiang)(xiang)接(jie)(jie)地時(shi)，開口(kou)三(san)角形(xing)兩(liang)端出(chu)現零序電(dian)(dian)(dian)(dian)(dian)壓(ya)，使絕(jue)緣(yuan)監(jian)察電(dian)(dian)(dian)(dian)(dian)壓(ya)繼電(dian)(dian)(dian)(dian)(dian)器動(dong)作，發出(chu)信號。

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