Research the distortion of applying CVT to measure harmonic in the high-voltage power network

Simulations of the CVT´s harmonic measurement and analysis of the sensitivity of the main components parameters using the steady-state circuit are taken in this paper. The transformation ratio characteristics have been simulated by using the high-frequency equivalent circuit, and the relationship between the main stray capacitance´s change and the change of CVT´s pass band is analyzed. At the same time, combining the engineering application, this paper proposes to make use of the combination of experimental data with artificial neural network to correct the CVT´s transformation ratio. This method can be used to monitor harmonic chronically through the CVT. Testified by emulators, this method is feasible.