Because of the influence of digital link factors such as the voltage divider, remote module parameter change and merging units, a DC electronic voltage transformer will have time delay. Thus it is difficult to accurately test and calibrate this time delay characteristic on site. First, the equivalent circuit model of a DC voltage transformer is established. Then the influence of passive components such as the DC voltage divider and low-pass filter on the delay time of the transformer is analyzed. Then a delay equivalent test method based on a transient steady state signal is proposed, and a field test system for the transient delay characteristics of the DC voltage transformer is developed. The delay time is accurately measured by the feedback time difference between the standard transient step signal and the measured DC voltage transformer. Finally, using the test scheme proposed, the time delay test is carried out on a DC project site to verify the effectiveness of the method. This work is supported by the National Natural Science Foundation of China (No. 52037003).