It is generally accepted that capacitor voltage transformer（CVT）

at harmonic environment and particularly at high frequency harmonic environment

has no way to reflect the voltage signal of the primary side and even not perform harmonic contents measurement due to its operation feature. The most existing study is to study its transfer function characteristic by way of setting up CVT model

analyze the influence of each parameter on the transfer function in the model so as to obtain accurate harmonic transfer feature. In this paper

the transfer function of the model is calculated through setting up high frequency equivalent model of CVT and by the use of PSCAD simulation

then the least square method is used to obtain the signal data of the secondary side by way of processing the simulation in MATLAB to recover the signal of the primary side

compare the original input signal either in global error or the error at each frequency can comply with actual need. Moreover

the harmonic range for simulation is wide

which has significance not only in simulation comparison

but also has actual application value in detecting the voltage of the primary side with CVT under steady operation.