Two types of group test methods are introduced for measuring the polarity of windings of single-phase and three-phase transformers based on the DC method.Taking two wiring groups(YN,y12 and YN,d11)as an example,analysis is conducted on the principle of DC method transformer measurement,the correspondence of polarity combination and vector graphs based on the vector decomposition method are investigated,and the relationship and the laws between the DC method and the vector deposition method is found out,which ensures the correctness of identifying the transformer groups.
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