In view of such issue that the accuracy of harmonic measurement data for capacitive voltage transformer（capacitor voltage transformer

CVT）has no way to meet the requirement of power quality monitoring system

a kind of implementation scheme of CVT with harmonic measurement function is proposed in this paper. The harmonic measurement signal of power grid is obtained by way of connecting capacitor C3 in series at the low voltage end of voltage divider of conventional CVT and by the use of voltage division principle. The broadband equivalent circuit model of the CVT is set up so to analyze the variation of output voltage on both sides of capacitor C3 in the harmonic frequency band and the key parameters affecting its frequency characteristic is defined. On the base of this proposal

1 sets of 110 kV CVT prototype with harmonic measurement is developed. The type test is passed and the harmonic accuracy test is performed. It is shown by the test result that the prototype in the range of 2 th to 50 th order harmonic signal measurement meets the harmonic requirements of power quality monitoring equipment and the effectiveness of the proposed scheme is verified further.