Research on Broadband Transfer Characteristics of Capacitive Voltage Transformer and Its Influencing Factors

Based on the basic structure of 110kV ${\text{TYD}}110\sqrt 3 0.02{\text{H}}$ type capacitive voltage transformer, a physical equivalent circuit model is constructed, the harmonic transmission characteristics of CVT are analyzed, and the influence of component equivalent parameters and distribution parameters on the amplitude and frequency response curves is given. Research shows that due to the influence of CVT distribution parameters, there are singular points in its amplitude and phase frequency transmission characteristic curves. By adjusting the equivalent resistance, inductance and distributed capacitance parameters of the compensation reactor and intermediate transformer, the frequency of the singular points appear can be effectively changed, thereby greatly improving the wide-frequency harmonic response characteristics and harmonic measurement accuracy of the CVT.