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In the power fault recorder, power transformer is an important factor which influences the phase measurement accuracy. This paper focused on the modeling, simulation and analysis of voltage transformer. Considering the impact of sampling frequency, accurate measurements of absolute error were made in single input case, and those of relative error were made between voltage channels and current channels with different recorder. Taking wave fault location and impedance fault location as examples, the influence of sampling system phase error on location accuracy was analyzed, and a compensation method was put forward accordingly.