Power quality has always been a hot topic of concern for users and power enterprises. With the increase of injection harmonics into equipment in the power grid

the issue of power quality has received increasing attention. Capacitor voltage transformer (CVT) is limited in its effective detection of harmonics due to its inability to accurately transmit harmonic signals under non power frequency conditions. In response to the issue on how to improve the test efficiency of CVT sample for manufacturers with numerous CVT models

a kind of improved CVT wideband transmission characteristic testing method is proposed in this paper. By injecting multiple harmonics into the CVT at once

the required frequency range transfer function can be tested with fewer test cycles. At the same time

by injecting multiple harmonic voltages into the medium voltage end of the CVT for testing

the amplitude requirement for the fundamental voltage output by the harmonic source has been reduced.