This voltage transformer has three poles and the iron is made of sheet . the body is fixed on the box cover by clamping . there have the primary and secondary bushing also on the box cover 本系列电压互感器的铁心由条形硅片叠成,为三柱芯式,器身用铁夹件固定在箱盖上,在箱盖上装有一次及二次套管等,油箱用钢板焊成,油箱壁下部装有接地螺栓及放油塞,箱底有四个安装孔。