电机学电机学电机学 (16).ppt
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1、Electrical MachineryVector Group Symbol of the Three-phase Transformer3.2.1 Vector Group Symbol of the Three-phase TransformerConcept of vector group symbolVector group symbol:indicating the connection type of the high-voltage winding and low-voltage winding of the transformer and the phase relation
2、 of the corresponding line electromotive forces of the high-voltage winding and low-voltage winding.(Y,y6)The connection method of the high-voltage winding is expressed with the capital letter,and the connection method of the low-voltage winding is expressed with the small letter.The letters N,n are
3、 the symbol of leading out from neutral point.3.2.2 Confirm vector group symbol of the three-phase transformer1.Clock methodSelect the EMF vector of the line on the high voltage side to act as the long hand,and fix the long hand to point at 0 oclock(12 oclock)on the clock dial;Regard EMF of the line
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