Abstract
An evaluation system or a transfer runcuon in rrequency aomam is aeveiopea in tms paper. i ne transre function of a two terminal-pair network is indispensable for estimating an input signal waveform from a give output. The transfer function is obtained by transforming the input and ouptut signals from time to frequent domain. To improve its numerical accuracy and stability, linear-approximated Laplace transform (LLT) applied.
To express the transfer function by a rational function, a nonlinear-parameter estimation method proposed. The proposed method is stable by applying a direct search method. Also, a differential functioi which is indispensable for Newton-Raphson method, is unnecessary.
A transfer function estimating system, which is composed of the frequency-time transformation and tr nonlinear parameter estimation, is developed. The system is more general than a conventional method whic is obtained from an equivalent circuit of a traget network.
The proposed method is applied to an input wave estimation of a capacitive voltage transformer of whic the equivalent circuit is unknown. The result shows a good agreement with a field test result.
