ABB EI813F 3BDH000022R1
1)用相电压矢量图画出Y/△接法的接线图
首先画出原边三相相电压矢量A、B、C,以原边A相相电压为基准,顺时针旋转到所要求的联接组。 Y/△-11的联接组别,顺时针旋转了330°后再画出次边a相的相电压矢量,此a相相电压矢量在原边A相与B相反方向-B的合成矢量上,由于原次边三相绕组A、B、C和a、b、c相对应,我们把次边a相绕组的头连接次边b相绕组尾,作为次边a相的输出线,由此在三角形接法中,只要确定了次边a相的连结,其他两相的头尾连接顺序和引出线就不会弄错。因此根据原次边相电压矢量便可画出Y/△-11组接线图。
2)用相电压矢量图来识别Y/Δ接法的联接组别
Y/△接法的联接组别,首先画出原边相电压矢量A、B、C,可以看出,次边a相绕组的尾连接C相绕组的头作为次边a相的输出线,由于次边a与原边A同相位,我们把次边a相相电压矢量画在原边相电压C和-A的中间,以原边A相为基准,顺时针旋转次边a相,它们之间的夹角为210°,由此这个接线图是Y/△-7组。
3)用相电压矢量图画出△/Y接法的接线图 首先画出次边a、b、c三相相电压矢量图,以次边a相相电压矢量为基准,逆时针旋转到所要求联接组,再根据此矢量图画出该组别的接线图。先画出△/Y-5组的矢量图,再逆时针旋转150°,画出原边A相相电压矢量,此A相相电压矢量上,因此根据此矢量图便可画出△/Y-5组的接线图可知,次边a、b、c三个头作为a、b、c三相的输出端,原边A的尾C的头,B的尾接A的头,C的尾接B的头分别作为A、B、C三相的输出端。
4)用相电压矢量图,识别△/Y接法的联接组别。
首先画出以次边a、b、c三相电压为基准的矢量图,再根据原边绕组的接法,只要将A相画在次边矢量上,以原边A相顺时针旋转到次边a相之间的夹角是多少,就知道该△/Y的接线图它属于第几组。识别图中△/Y的接线图它属于几组,根据上面的方法,画出次边a、b、c三相相电压矢量图,从接线图中可以看出原边A相绕组的头连接B相绕组的尾作为原边A相引出线,因此我们把原边相电压矢量A画到次边矢量a和-b中间,而次边C相绕组的头作为次边a相输出,因此我们把次边矢量C当成是矢量a调相来使用,然后以原边A相顺时旋转到次边a相,它们的夹角为270°,因此这个接线图为△/Y-9联接组。
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