Comparisons Between Lab Measurements and Digital Simulations for a Coupling Capacitor Voltage Transformer

In this work, measurements were carried out for a 230 kV coupling capacitor voltage transformer (CCVT) in a high voltage laboratory. In order to obtain the frequency response data to be used as input data to a routine developed to compute the CCVT parameters, frequency response measurements, for magnitude and phase, were carried out for the CCVT. These measurements were made directly, without the need of using external resistors in the CCVT terminals. It is shown that the use of , as proposed in some works in literature, may cause distortions in the frequency response curves. In order to validate the CCVT model in time-domain studies, ferro-resonance and circuit breaker switching operations tests were carried out for the CCVT, and the errors were fairly small for both tests