In this paper

aiming at the problem that capacitor voltage transformer（CVT）cannot measurethe harmonic accurately

the method of correcting CVT measurement value is discussed. Firstly

theoperating principle of CVT is analyzed

the equivalent circuit model is established and the transfercharacteristic of the CVT to each harmonics is simulated and studied by the Matlab/Simulink tool on thebasis of the equivalent circuit model. It is shown by the simulation that although the extend of deformationof each order of harmonic through the CVT is different

yet for the CVT of which the internal parametersare fixed

the harmonic coefficient of the same order of harmonics and phase variation are free from theinfluence of the contents of harmonic. Base on the above conclusion

the harmonic correction systemframe is established based on the frequency characteristic database of the CVT and the new method forcorrecting harmonic measurement value with combination of the frequency data of the CVT and digitalcomputation is proposed.