阐述牵引变电所三相V/v接线牵引变压器差动保护极性的影响因素及其校验方法（微机保护的极性、主变压器的极性和电流互感器的极性3方面）,分析了包西线某牵引变电所主变压器设计和接线的缺陷,提出并验证了三相V/v接线牵引变压器差动保护接线方式的正确性。%The paper illustrates the factors affecting the potential protection polarities of the V/v connected traction transformer in traction substation and the correction methods （in terms of three aspects including the polarity of the macro-computer protection, polarity of main transformer and polarity of the current transformer）, analyzes the defects of design and wire connection for the main transformer in a traction substation in Baotou-Xi’an railway line, puts forward and verifies the correctness of the three phase V/v connected traction transformer potential protection wiring mode.
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