Abstract
Usually, the secondary voltage of a Coupling Capacitor Voltage Transformer (CCVT) is not a perfect replica of its primary voltage. In this study, the steps to design a hardware capable of performing the correction of the CCVT secondary voltage is presented. The device is basically a recursive digital filter whose parameters are obtained from the CCVT frequency response. The evaluation of the device is made by connecting it to the Real Time Digital Simulator ( $$\text{ RTDS }^\mathrm{TM}$$ ) and carrying out real time simulations for two case studies: harmonic distortion and short-circuit in a 230 kV system. It is shown that the hardware device brings the CCVT secondary voltage waveform close to the primary voltage signal.
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