It is shown by the actual operation that the electric field is one of the important factors affecting the measurement error of the capacitor voltage transformer（CVT）.In order to analyze the influence of electric field on CVT measurement error

finite element simulation software is used in this paper to analyze the influence of surrounding objects

high voltage leads and phase interference on the error characteristics of220 kV CVT.It is shown by the simulation result that the CVT measurement error increases linearly with the surrounding object potential U

and the linearity is related to the object distance D.As the object distance D increases the CVT measurement error gradually decreases.When the distance is greater than 3 m

the error caused by the surrounding objects to the 220 kV CVT is negligible.The effect of the high voltage lead on the CVT error is related to the length and diameter of the lead and its angle to the horizontal direction of the CVT.For the three-phase 220 kV CVT

considering the actual arrangement and safety regulations of the substation electrical equipment

the phase-to-phase distance is chosen to be 4 m optimal.Meanwhile

on the basis of simulation

the experimental platform is built to verify the correctness of the simulation results.