基于电压相量的三相变压器组别判定方法

三相变压器有多种联接方式，国际上通常采用时钟表示法，即用三相变压器高、低压绕组“线电势”的相位关系标志三相变压器的联接组别,这种线电势相量不能直观反映变压器绕组的实际接线.在本文中提出了一种基于“电压”相位关系判定三相变压器联接组别的新方法.以原、副边绕组电压相量尾端为共起点,根据副边相电压与原边相电压的相位关系,实现副边电压相量的旋转,从而确定变压器的联接组别,分析过程简单、直观，并提出了三相绕组左、右三角形接线方式的概念.

The winding group analysis of three-phase transformer based on the voltage vector

There are various connection methods for three-phase transformer.It is stipulated internationally with clock-denoted method that the linking groups of three-phase transformer are symbolized by the relationship between the first side line-potential and the second one of the three-phase transformer.But this line-potential can not reflect the real linking of the transformer windings direetly.This paper presents a new method to determine the linking groups of three-phase transformer based on the voltage phase relationship.The linking groups of transformer are confirmed by rotating the voltage vectors of second side according to the phase between the first and second side phase-voltage.The analytic course is simple and directly perceivable,the concept of left/right triangle wiring mode of three phase windings is proposed.It is also a new method of power electronics subject education.