Determinação da função de transferência de transformador de potencial capacitivo.

Abstract

The use of mathematical models is essential to solve problems related to transient overvoltages caused by switching operations in coupling capacitor voltage transformers (CCVT). This work presents a methodology based on a vector fitting method used to obtain the CCVT frequency response from laboratory measurement data. The magnitude and phase of the transfer function are the required input data to the fitting routine. Measurements of iron core characteristics are carried out to include nonlinearities in the model. I n this work, an optimization method to estimate CCVT stray capacitances, is also presented. The model may be used in connection with the EMTP (Electromagnetic Transients Program).