Aiming at the overhaul renovation project of traction substation for three⁃phase V/V connection transformer,the compensation effect of dynamic reactive power compensation device is expounded. With the various capacity combination modes, the site test was carried out,and influence on power factor and the main reason are analyzed. The problem existing in transfor⁃mation of reactive power compensation device of traction substation is reasonably solved. A lag calculation method is used to de⁃termine the relative capacity parameters of the reactive power compensation device and make the traction substation power factor meet the requirements. Through the scheme comparison and selection,the final result reached the target value. Also at the same time,the conclusions that the compensation effect of adjustable reactor and the reactive power compensation device is not relat⁃ed to its access phase,and the lag calculation method for capacity of the reactive power compensation device is effective and fea⁃sible.%针对三相V/V接线变压器的牵引变电所大修改造工程，阐述了动态无功补偿装置的补偿效果。通过多种容量组合方式进行现场测试，对功率因数所产生的影响，分析其主要原因，合理对待牵引变电所无功补偿装置改造中存在的问题，并采用滞后计算方法确定无功补偿装置相关容量参数，使牵引变电所功率因数满足要求。通过方案比选、实施，最终结果达到了目标值。也同时得出三相V/V接线牵引变压器的变电所，其无功补偿装置和可调电抗器的补偿效果与其接入相别无关、无功补偿装置其容量采用滞后计算方法是有效可行的。
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