描述
使三相调压器的输出电压由零值逐渐升高，当电流达到电动机额定电流时即停止升压，此时的电压称为短路电压。额定电压为380V的电动机，其短路电压一般为75–90伏。短路电压的大小，反映漏电抗的大小。短路电压过高，表示漏电抗太大，这是定子绕组匝数过多造成的；短路电压过低，说明漏电抗太小，这是定子绕组匝数过少引起的。
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